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All patents, so far processed by AudioAnnals (from 1877 to 2005), are listed in this page. Check back often as more patents are processed almost daily. Hint: Open the documents twice (two open windows). This makes it easier to view the text and drawings simultaneously. Enjoy!

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*U.S. Patent No. 199,141 , 01/15/1878 (app. 10/16/1877) Improvement in Telephones (class: 379/167.01; 379/391; 381/178) Berliner, Emile [abstract] [DjVu258KB]

*U.S. Patent No. 200,521, 02/19/1878: Improvement in phonograph or speaking machines (class: 369/155; 369/260; 434/319) Edison, Thomas A. [abstract] [DjVu178KB]

*U.S. Patent No. 201,760 , 03/26/1878 ((app. 03/04/1878 (22 days!)) IMPROVEMENT IN SPEAKING-MACHINES. (class: 181/177; 369/156) Edison, Thomas A. [abstract] [DjVu49KB]

*U.S. Patent No. 204,228 , 05/28/1878 (app. 03/25/1878) IMPROVEMENT IN PRODUCING TUBES AND HOLLOW ARTICLES FROM CELLULOID AND OTHER PLASTIC MATERIALS. (class: 264/271.1; 264/279.1; 264/DIG71) Hyatt, John W. (assignee: The Celluloid Manufacturing Co.) [abstract] [DjVu53KB]

*U.S. Patent No. 213,554 , 03/25/1879 (app. 03/26/1877) IMPROVEMENT IN AUTOMATIC TELEGRAPHS. (class: 178/17A; 178/92) Edison, Thomas A. [abstract] [DjVu141KB]

*U.S. Patent No. 219,939 , 09/23/1879 (app. 11/29/1878) IMPROVEMENT IN PHONOGRAPHS. (class: 369/158; 369/179; 369/260) Hall, A. Wilford [abstract] [DjVu141KB]

*U.S. Patent No. 220,169 , 09/30/1879 (app. 07/01/1879) IMPROVEMENT IN SOUND-COLLECTORS (class: 181/175) Oakley, William H. [abstract] [DjVu36KB]

*U.S. Patent No. 222,292 , 12/02/1879 (app. 08/02/1879) IMPROVEMENT IN SHOCK OR JAR RECORDERS. (class: 346/7; 346/49; 346/126) Luders, Thomas L. (assignee: one-half of his right to Charles J. A. Dick, of Lee, England) [abstract] [DjVu83KB]

*U.S. Patent No. 222,652 , 12/16/1879 (app. 04/14 & 06/04/1877) Contact-Telephone (class: 381/178) Berliner, Emile [abstract] [DjVu68KB]

*U.S. Patent No. 224,573 , 02/17/1880 (app. 09/05/1879) Microphone (class: 381/180; 381/178; 381/354) Berliner, Emile [abstract] [DjVu78KB]

*U.S. Patent No. 225,457 , 03/16/1880 (app. 02/02/1878) PROCESS OF ENGRAVING PRINTING-SURFACES. (class: 409/84; 101/401.1) Bradley, Milton [abstract] [DjVu90KB]

*U.S. Patent No. 225,790 , 03/23/1880 (app. 11/12/1879) MICROPHONE (class: 381/354; 381/180) Berliner, Emile [abstract] [DjVu69KB]

*U.S. Patent No. 227,644 , 05/18/1880 (app. 01/07/1880) SOUND-ARTICULATOR. (class: 181/127) Orvis, Orel D. [abstract] [DjVu72KB]

*U.S. Patent No. 227,679 , 05/18/1880 (app. 03/29/1879) PHONOGRAPH. (class: 369/214; 116/144; 181/162) Edison, Thomas A. [abstract] [DjVu115KB]

*U.S. Patent No. 232,978 , 10/05/1880 (app. 04/30/1880) (Patented in Great Britain, 04/01/1878 - No. 1,278) STEAM-ENGINE RECORDER. (class: 346/6; 73/712; 73/741) Kenyon, John W. [abstract] [DjVu82KB]

*U.S. Patent No. 235,120 , 12/07/1880 (app. 09/03/1880, no model) PHOTOPHONIC TRANSMITTER. (class: 359/150; 359/180; 381/172) Berliner, Emile [abstract] [DjVu53KB]

*U.S. Patent No. 235,199 , 12/07/1880 (app. 08/28/1880, no model) APPARATUS FOR SIGNALING AND COMMUNICATING, CALLED "PHOTOPHONE." (class: 359/149; 250/214.1; 359/213; 359/226; 359/235; 359/236; 359/291; 455/550) Bell, Alexander G. (assignee: American Bell Telephone Company) [abstract] [DjVu477KB]

*U.S. Patent No. 235,496 , 12/14/1880 (app. 09/25/1880, no model) PHOTOPHONE-TRANSMITTER. (class: 359/150; 359/170) Bell, Alexander G. and Tainter, Sumner [abstract] [DjVu91KB]

*U.S. Patent No. 235,497 , 12/14/1880 (app. 09/25/1880, no model) SELENIUM-CELL. (class: 338/17; 169/37; 250/214.1; 250/338.1) Bell, Alexander G. and Tainter, Sumner [abstract] [DjVu123KB]

*U.S. Patent No. 235,590 , 12/14/1880 (app. 09/25/1880, no model) SELENIUM-CELL. (class: 338/17) Tainter, Sumner [abstract] [DjVu105KB]

*U.S. Patent No. 238,929 , 03/15/1881 (app. 11/30/1880, no model) AUTOMATIC TELEGRAPH. (class: 178/3; 178/89 ) Leggo, William A. (assignee: Electro Graphic Manufacturing Co.) [abstract] [DjVu155KB]

*U.S. Patent No. 241,909 , 05/24/1881 (app. 03/24/1881, no model) PHOTOPHONIC RECEIVER. (class: 359/150; 250/214.1; 359/154; 359/212; 359/223; 359/291) Bell, Alexander G. and Tainter, Sumner [abstract] [DjVu205KB]

*U.S. Patent No. 259,397 , 06/13/1882 (app. 12/17/1880, no model) APPARATUS FOR TRANSMITTING AND REPRODUCING SPEECH. (class: 181/138) Hussey, Charles A. (assignee: Hussey Electric Company) [abstract] [DjVu94KB]

*U.S. Patent No, 270,342 , 01/09/1883 (app. 10/09/1882, no model) PROCESS OF AND MEANS FOR MAKING TUBES FROM CELLULOID AND OTHER PLASTIC MATERIAL. (class: 156/218; 138/140; 156/203; 264/314; 264/DIG50) Sargent, Willard E. [abstract] [DjVu57KB]

*U.S. Patent No. 277,349 , 05/08/1883 (app. 03/07/1883, no model) AUTOMATIC TELEGRAPH. (class: 178/3; 178/92; 369/69) Rogers, J. Harris [abstract] [DjVu167KB]

*U.S. Patent No. 279,292, 06/12/1883 (U.S. app. 04/10/1882, no model) (Patented: in France 02/23/1882, No. 147,522; in Belgium 02/24/1882, No. 57,154; in England 03/01/1882, No. 900; in Germany 03/10/1882, No. 20,401) APPARATUS FOR RECORDING SPEED OF TRAINS ON RAILWAY-BRIDGES. (class: 346/33D; 346/80; 346/138) Waldrop, Jan Herman Marie (Nymwegen, Holland) [abstract] [DjVu224KB]

*U.S. Patent No. 281,529 , 07/17/1883 (app. 05/10/1883, no model) PROCESS OF AND APPARATUS FOR LINING HOLLOW ARTICLES WITH CELLULOID, &c. (class: 156/287; 156/294; 264/DIG50; 425/387.1) Lefferts, Marshall C. (assignee: The Celluloid Manufacturing Company) [abstract] [DjVu114KB]

*U.S. Patent No. 283,665 , 08/21/1883 (app. 05/03/1883, no model) AUTOMATIC TELEGRAPH. (class: 178/17R; 178/92) Rogers, James Webb [abstract] [DjVu155KB]

*U.S. Patent No. 284,268 , 09/04/1883 (app. 04/28/1883, no model) CARPET (class: 428/44; 428/119) Berliner, Emile of Boston, MA [DjVu96KB]

*U.S. Patent No. 287,166 , 10/23/1883 (app. 05/28/1883, no model) PHONOGRAPH. (class: 369/155) Reynolds, Christopher C. [abstract] [DjVu288KB]

*U.S. Patent No. 341,214 , 05/04/1886 (app. 06/27/1885, no model) RECORDING AND REPRODUCING SPEECH AND OTHER SOUNDS. (class: 369/155; 29/DIG104; 82/1.12; 181/21; 181/162; 181/167) Bell, Chichester A. and Tainter, Sumner [abstract] [DjVu304KB]

*U.S. Patent No. 341,288 , 05/04/1886 (app. 12/04/1885, no model, serial 184,655), APPARATUS FOR RECORDING AND REPRODUCING SOUNDS. (class: 369/223; 369/225; 369/260; 369/286; 369/288) Tainter Sumner [DjVu586KB]

*U.S. Patent No. 372,786 , 11/08/1887 (app. 05/04/1887 and 11/26/1887) GRAMOPHONE. (class: 369/155; 369/277; 369/287) Berliner, Emile [abstract] [DjVu178LB]

*U.S. Patent No. 375,579, 12/27/1887 (app. 07/07/1887, no model, serial 243,601) APPARATUS FOR RECORDING AND REPRODUCING SPEECH AND OTHER SOUNDS. (class: 369/223; 29/DIG98; 369/72; 369/260; 369/283) Tainter, Charles Sumner [DjVu546KB]

*U.S. Patent No. 382,790 , 05/15/1888 (app. 03/17/1888, no model, serial 287,565) PROCESS FOR PRODUCING RECORDS OF SOUND. (class: 369/17) Berliner, Emile [DjVu62KB] also see 372,786

*U.S. Patent No. 386,974 , 07/31/1888 (app. 11/26/1887, no model, serial 256,189) PHONOGRAPH. (class: 369/53.39; 369/223; 369/260) Edison, Thomas A. [DjVu339KB]

*U.S. Patent No. 393,640 , 11/27/1888 (app. 06/07/1888, no model, serial 276,393) PHONOGRAPH. (class: 369/223; 369/256) Gilliland, Ezra T. (assignee: Phonograph Company, Orange, New Jersey) [DjVu144KB]

*U.S. Patent No. 404,850 , 06/11/1889 (app. 08/08/1888, no model, serial 282,260) METHOD OF RECORDING ARTICULATE SPEECH OR OTHER SOUNDS. (class: 369/126) Littlehales, George W. [DjVu144KB]

*U.S. Patent No. 407,127 , 07/16/1889 (app. 03/30/1889, no model, serial 305,365) PHONOGRAM-RECEIVING BOX. (class: 206/15) Searle, Harry F. [DjVu69KB]

*U.S. Patent No. 409,003 , 08/13/1889 (app. 04/11/1889, no model, serial 306,812) METHOD OF RECORDING AND REPRODUCING SOUNDS. (class: 369/165) Bettini, Gianni [DjVu102KB]

*U.S. Patent No. 414,761 , 11/12/1889 (app. 08/10/1889, no model, serial 320,398) PHONOGRAM-BLANK. (class: 138/173; 249/59) Edison, Thomas A. [DjVu61KB]

*U.S. Patent No. 423,039 , 03/11/1890 (app. 07/02/1889, no model, serial 316,324) PHONOGRAPH FOR DOLLS OR OTHER TOYS. (class: 369/214; 369/63; 446/302; 446/397) Edison, Thomas A. [DjVu170KB]

*U.S. Patent No. 427,279 , 05/06/1890 (app. 08/06/1889, no model, serial 319,866) GRAMOPHONE. (class: 369/158; 369/164) Suess, Werner (assignee: Emile Berliner) [DjVu232KB]

*U.S. Patent No. 428,750 , 05/27/1890 (app. 12/18/1889, no model, serial 334,196) COIN-ACTUATED ATTACHMENT FOR PHONOGRAPHS. (class: 194/244; 369/24.01) Glass, Louis and Arnold, William S. (assignee: R.W. Smith) [DjVu276KB]

*U.S. Patent No. 453,741 , 06/09/1897 (app. 07/30/1890, no model, serial 360,348) PHONOGRAPH. (class: 369/157) Edison, Thomas A. [DjVu120KB]

*U.S. Patent No. 454,941 , 06/30/1891 (app. 05/24/1890, no model, serial 352,985) PHONOGRAPH RECORDER OR REPRODUCER. (class: 181/162; 181/170) Edison, Thomas A. [DjVu50KB]

*U.S. Patent No. 460,492 , 09/29/1891 (app. 08/20/1890 and 09/11/1891, no model, serial 405,359) COMBINED CASH-REGISTER AND PHONOGRAPH. (class: 235/14; 369/69) Hayden, Austin B. (assignee: Hayden Articulating Cash Register Company) [DjVu458KB]

*U.S. Patent No. 462,228, 11/03/1891 (app. 01/28/1891, no model, serial 379,356) SPEED-REGULATOR FOR MOTORS. (class: 188/185) Amet, Edward II. [DjVu63KB]

*U.S. Patent No. 463,569 , 11/17/1891 (app. 06/04/1877) COMBINED TELEGRAPH AND TELEPHONE. (class: 381/178) Berliner, Emile of Washington, D.C. (assignee: American Bell Telephone Company of Boston, MA) [DjVu119KB]

*U.S. Patent No. 470,477 , 03/08/1892 (app. 06/16/1891, no model, serial 396,517) PHONOGRAPH. (class: 369/214) Chriswell, Francis M. of Washington, D.C. and Chriswell, James A. E. of Brooklyn, NY (assignee: James A. E. Chriswell to Francis M. Chriswell) [DjVu149KB]

*U.S. Patent No. 472,417 , 04/05/1892 (app. 12/03/1891, no model, serial 413,871) COIN-CONTROLLED APPARATUS FOR GRAMOPHONES. (class: 194/243; 194/294; 369/24.01) Wilson, Edward L. of New York, NY [DjVu125KB]

*U.S. Patent No. 475,490 , 05/24/1892 (app. 03/17/1892, no model, serial 425,259) METHOD OF AND MEANS FOR DUPLICATING OR TRANSFERRING PHONOGRAPHIC RECORDS. (class: 369/84) Douglass, Leon F. of Washington, D.C. (assignee: Easton, Edward D. of Washington, D.C.) [DjVu91KB]

*U.S. Patent No. 488,381 , 12/20/1892 (app. 03/14/1892, no model, serial 424,815) PHONOGRAPH. (class: 82/11.1; 369/161; 369/166; 369/168) Bettini, Gianni of New York, NY [DjVu70KB]

*U.S. Patent No. 490,450, 01/24/1893 (app. 04/10/1890, no model, serial 347,407) (Patented in England, 12/07/1888, No. 17,987) COIN-FREED MACHINE. (class: 194/282; 194/346) Madgen, William Leonard of London, England [DjVu122KB]

*U.S. Patent No. 494,633 , 04/04/1893 (app. 03/25/1892, no model, serial 426,443) (Patented in England, 05/08/1891, No. 7,962) APPARATUS FOR CONTROLLING THE SPEED OF CLOCKWORK MECHANISM. (class: 188/270; 188/290) Greenhill, Joseph Exall of London, England (assignee: One-half to Gourand, Edward of Beulah Hill, England) [DjVu153KB]

*U.S. Patent No. 499,879 , 06/20/1893 (app. 07/30/1888, no model, serial 281,453) PHONOGRAPH. (class: 369/72; 369/92; 369/219) Edison, Thomas Alva of Llewellyn Park, NJ (assignee: Edison Phonograph Company of NJ) [DjVu422KB]

*U.S. Patent No 505,910 , 10/03/1893 (app. 06/29/1891, model, serial 397,860) TABLET FOR RECORDING SOUND-VIBRATIONS. (class: 428/64.2; 369/286; 369/288) Wassenich, Joseph E. of Chicago, IL) [DjVu75KB]

*U.S. Patent No. 506,348 , 10/10/1893 (app. 04/27/1893, no model, serial 472,110) COIN-CONTROLLED GRAPHOPHONE. (class: 194/245) Tainter, Charles Sumner of Washington, D.C. [DjVu216KB]

*U.S. Patent No. 513,095 , 01/23/1894 (app. 12/27/1889, no model, serial 335,140) PHONOGRAPH. (class: 188/187) Edison, Thomas Alva of Llewellyn Park, NJ [DjVu114KB]

*U.S. Patent No. 518,190 , 04/10/1894 (app. 01/31/1891, no model, serial 379,824) ATTACHMENT FOR PHONOGRAPHS. (class: 194/291) Keller, Albert K. of New York, NY (assignee: Automatic Phonograph Exhibition Company of New York by Mesne Assignments) [DjVu445KB]

*U.S. Patent No. 523,556 , 07/24/1894 (app. 11/30/1892, no model, serial 453,576) COIN-OPERATED MECHANISM FOR PHONOGRAPHS. (class: 194/246; 369/223) Tewksbury, George E. of Topeka, KS (assignee: The United States Phonograph Company of NJ by Mesne Assignments) [DjVu237KB]

*U.S. Patent No. 528,273 , 10/30/1894 (app. 12/20/1893, no model, serial 494,179) (Patented in France 05/18/1893, No. 230,177) PHONOGRAPH. (class: 369/218; 264/220; 264/322; 264/334; 369/63; 369/277) Lioret, Henri Jules of Paris, France [DjVu226KB]

*U.S. Patent No. 532,718 , 01/15/1895 (app. 12/13/1893, no model, serial 493,517) PHONOGRAPH. (class: 188/186) Broich, Joseph of Brooklyn, NY (assignee: Pearce, Frederick of New York, NY) [DjVu202KB]

*U.S. Patent No. 532,851 , 01/22/1895 (app. 05/12/1892, serial 432,806, no model) DISK GRAPHOPHONE (class: 369/223) Wassenich, Joseph E. of Chicago, IL [DjVu217KB]

*U.S. Patent No. 534,543 , 02/19/1895 (app. 03/30/1892, no model, serial 427,060) GRAMOPHONE. (class: 369/153; 181/21; 369/223; 369/288) Berliner, Emile of Washington, D.C. (assignee: United States Gramophone Company of Washington, D.C.) [DjVu350KB]

*U.S. Patent No. 535,445 , 03/12/1895 (app. 02/16/1894, no model, serial 500,412) OPERATING MECHANISM FOR PHONOGRAPHS. (class: 185/44; 188/187) Glass, Louis of San Francisco, CA [DjVu131KB]

*U.S. Patent No. 562,694 , 06/23/1896 (app. 11/20/1895, no model, serial 569,551) GRAPHOPHONE OR DEVICE FOR REPRODUCING SOUNDS FROM SOUND-WRITINGS. (class: 369/162) Amet, Edward H. of Waukegan, IL (assignee: Assignor of one-half to Dickinson, Charles of Chicago, IL) [DjVu100KB]

*U.S. Patent No. 569,290 , 10/13/1896 (app. 11/02/1895, no model, serial 567,729) GRAPHOPHONE. (class: 369/223; 369/245) MacDonald, Thomas H. of Bridgeport, CT (assignee: The American Graphophone Company of WV) [DjVu343KB]

*U.S. Patent No. 570,378 , 10/27/1896 (app. 12/20/1895, no model, serial 572,744) SPRING-MOTOR FOR PHONOGRAPHS, &c. (class: 185/37; 185/40L; 188/187) Capps, Frank L. of Newark NJ (assignee: The United States Phonograph Company of Newark, NJ) [DjVu198KB]

*U.S. Patent No. 598,529 , 02/08/1898 (app. 10/08/1896, no model, serial 608,207) SPRING-MOTOR. (class: 185/45) Montross, Levi H. of Camden, NJ [DjVu84KB]

*U.S. Patent No. 621,316 , 03/21/1889 (app. 10/14/1888, serial 693,520, no model) FLOOR-COVERING (class: 442/269; 156/326; 442/281; 442/369; 442/394; D5/53) Berliner, Emile of Washington, D.C. [DjVu71KB]

*U.S. Patent No. 656,162 , 08/21/1900 (app. 12/05/1899, serial 739,232, no specimens) FLOOR-COVERING. (class: 428/67; 40/615) Berliner, Emile of Washington, D.C. [DjVu73KB]

*U.S. Patent No. 1,173,079 , 02/22/1916 (app. 10/29/1913, serial 797,998) SELECTIVE TUNING SYSTEM (class: 455/291; 313/298; 329/349; 455/307) Alexanderson, Ernst F. W. of Schenectady, NY (assignee: General Electric Company of New York) [DjVu225KB] [Comments]

*U.S. Patent No. 1,573,475 , 02/16/1926 (app. 08/13/1925, serial 50,125) AUDITORIUM WALL AND THE LIKE. (class: 52/6; 52/144; 52/390; 52/508; D25/158) Berliner, Emile of Washington, D.C. [DjVu67KB]

*U.S. Patent No. 1,637,119 , 07/26/1927 Electromagnetic Sound Reproducer Kolster, Frederick A. and Sollie, Sigurd A. (assignee Federal Telegraph Company) [abstract] [DjVu119KB]

*U.S. Patent No. 1,693,401 , 11/27/1928 Telephone Circuits and apparatus Nyman, Alexander and Conrad, Frank (assignee Westinghouse Electric and Manufacturing Company) [abstract] [DjVu77KB]

*U.S. Patent No. 1,730,528 , 10/08/1929 (app. 02/28/1927) ACOUSTIC TRANSFORMER (class: 369/156; 181/163; 181/400) Robbins, Percy A. [abstract] [DjVu126KB]

*U.S. Patent No. 1,730,531 , 10/08/1929 (app. 11/30/1928) Acoustic Transformer (class: 381/166; 381/186) Robbins, Percy A. [abstract] [DjVu97KB]

*U.S. Patent No. 1,730,532 , 10/08/1929 (app. 11/30/1928) Acoustic Transformer (class: 181/153; 181/157) Robbins, Percy A. [abstract] [DjVu48KB]

*U.S. Patent No. 1,748,407 , 02/25/1930 (app. 07/18/1927) Loud-Speaker Unit (class: 335/231; 335/274; 381/417) Bottorff, Charles A. (assignee: Trimm Radio Manufacturing Co.) [abstract] [DjVu172KB]

*U.S. Patent No. 1,752,247 , 03/25/1930 (app. 04/18/1929, serial 356,223) CONVERTING APPARATUS (class: 363/121; 307/107; 331/130; 331/131) Fitz Gerald, Alan S. of Schenectady, NY (assignee: General Electric Company, Inc. of NY) [DjVu71KB] [Comments]

*U.S. Patent No. 1,761,100 , 06/03/1930 (app. 01/23/1928) ACOUSTIC DIAPHRAGM AND LOUD-SPEAKER COMBINATION (class: 381/345; 381/418) Baldwin, Nathaniel [abstract] [DjVu55KB]

*U.S. Patent No. 1,787,946 , 01/06/1931 (app. 05/14/1925) MEANS FOR CONVERTING ELECTRICAL VIBRATIONS INTO SOUND WAVES (class: 381/152; 181/163; 381/166; 381/186; 381/337) LaRue, William D. (assignee: Victor Talking Machine Company) [abstract] [DjVu272KB]

*U.S. Patent No. 1,820,956 , 09/01/1931 (app. 11/27/1925 & in Germany 12/24/1924) LOUD SPEAKER (class: 181/148; 340/388.3) von Arco, Georg (assignee: Gesellschaft Fur Draht-Lose Telegraphie M. B. H., Berlin) [abstract] [DjVu40KB]

*U.S. Patent No. 1,822,758 , 09/08/1931 (app. 09/16/1929, serial 392,907 - in France 09/21/1928) SYSTEM FOR TRANSMITTING AND AMPLIFYING VIBRATORY CURRENTS AND MOVEMENTS (class: 369/134; 324/125; 381/96) Toulon, Pierre Marie Gabriel of Puteaux, France [DjVu134KB] [Comments]

*U.S. Patent No. 1,830,402 , 11/03/1931 Electromagnetic Sound Reproducer Miessner, Benjamin F. (assignee Miessner Inventions, Inc.) [abstract] [DjVu156KB]

*U.S. Patent No. 1,841,101 , 01/12/1932 (app. 03/06/1930) LOUD SPEAKER (class: 181/166) Flanders, Paul B and Harrison, Henry C. (assignee: Bell Telephone Laboratories, Inc.) [abstract] [DjVu102KB]

*U.S. Patent No. 1,868,607 , 07/26/1932 Electromagnetic Sound Reproducer System Kolster, Frederick A. (assignee Federal Telegraph Company) [abstract] [DjVu88KB]

*U.S. Patent No. 1,874,159 , 08/30/1932 (app. 09/26/1930, serial 484,627) ELECTRIC AMPLIFYING CIRCUITS (class: 330/10; 330/122; 330/147; 330/207A; 363/121) Bedford, Burnice D. of Schenectady, NY (assignee: General Electric Company, Inc. of New York) [DjVu136KB] [Comments]

*U.S. Patent No. 1,878,162 , 09/20/1932 (app. 11/30/1931) CONICAL DIAPHRAGM FOR SOUND REPRODUCING AND RECORDING APPARATUS (class: 369/160; 181/163; 381/186; 381/432) Mead, Harold Bertram [abstract] [DjVu77KB]

*U.S. Patent No. 1,902,495 , 03/21/1933 (app. 08/08/1930, serial 473,913) ELECTRIC POWER CONVERTING APPARATUS (class: 363/121; 315/187; 315/230) Fitz Gerald, Alan S. of Wynnewood, PA (assignee: General Electric Company, Inc. of NY) [DjVu80KB]

* U.S. Patent No. 1,907,723, 05/09/1933 Sound Reproducing Device Bostwick, Lee G. (assignee Bell Telephone Laboratories) [abstract] [DjVu286KB] [Comments]

*U.S. Patent No. 1,931,235 , 10/17/1933 Sound Reproducing System Nicolson, Alexander McLean (assignee Wired Radio, Inc.) [abstract] [DjVu113KB]

*U.S. Patent No. 1,967,223 , 07/24/1934 (app. 01/06/1933) VIBRATION TRANSMITTING DEVICE (class: 181/173; 381/386) Bostwick, Lee G. and Chatham, N. J. (assignee: Bell Telephone Laboratories, Inc.) [abstract] [DjVu187KB]

*U.S. Patent No. 1,988,250 , 01/15/1935 (app. 02/17/1934) LOUD SPEAKER AND METHOD OF PROPAGATING SOUND (class: 381/184; 181/147; 181/163; 381/89) Olson, Harry F. and Collingswood, N. J. (assignee: Radio Corporation of America) [abstract] [DjVu89KB]

*U.S. Patent No. 2,007,748 , 07/09/1935 Acoustic Device Olson, Harry F. (assignee Radio Corporation of America) [abstract] [DjVu182KB]

*U.S. Patent No. 2,038,687 , 04/28/1936 (app: 03/13/1935 - serial: 10,922) ACOUSTIC TRANSLATING DEVICE (class: 369/149) Sykes, Adrian Francis of St. Albans, England [DjVu252KB]

*U.S. Patent No. 2,084,160 , 06/15/1937 Filter System for Loudspeakers Minton, John Preston and Ringel, Abraham S. (assignee Radio Corporation of America) [abstract] [DjVu112KB]

*U.S. Patent No. 2,102,671 , 12/21/1937 (app. 04/22/1929, serial 606,871) WAVE TRANSLATION SYSTEM (class: 330/57; 84/DIG10; 324/123C; 330/76; 330/77; 330/87; 330/92; 330/100; 330/102; 330/106; 330/107; 330/108; 330/110; 330/111; 330/112; 333/18) Black, Harold S. of Westfield, N.J. (assignee: Bell Telephone Laboratories, Inc. of New York, N.Y.) [[87 pages] [DjVu* Drawings 609KB] [DjVu* Text 908KB]] [Comments]

*U.S. Patent No. 2,113,393 , 04/05/1938 Audio Frequency Amplifier Bierwirth, Rudalph A. (assignee Radio Corporation of America) [abstract] [DjVu88KB]

*U.S. Patent No. 2,114,471 , 04/19/1938 (app: 06/20/1936 - serial: 86,228) SOUND RECORDING AND REPRODUCING SYSTEM (class: 369/86; 369/91; 369/132; 369/136) Keller, Arthur C. of Mount Vernon, NY and Rafuse, Irad S. of Hempstead, NY (assignee: Bell Telephone Laboratories, Inc. of New York, NY) [DjVu112KB]

*U.S. Patent No. 2,121,008 , 06/21/1938 (app. 07/16/1936) ACOUSTIC TRANSLATING DEVICE (class: 181/31) Bilhuber, Paul H. [abstract] [DjVu106KB]

*U.S. Patent No. 2,182,328 , 12/05/1939 Band Width and Tone Control Circuit Weinberger, Juilus (assignee Radio Corporation of America) [abstract] [DjVu103KB]

*U.S. Patent No. 2,310,243 , 02/09/1943 (app. 02/05/1940, serial 317,260) HORN FOR LOUD-SPEAKER (class: 181/152; 181/156) Klipsch, Paul W. of Houston, Texas (assignee: 20% to Smith, Ray L. of Houston, Texas) [DjVu106KB]

*U.S. Patent No. 2,373,692 , 04/17/1945 (app. 10/03/1942, serial 460,596) LOUD-SPEAKER (class: 181/152; D14/210) Klipsch, Paul W. of Hope, Arkansas (assignee: 20% to Smith, Ray L. of Houston, Texas [DjVu227KB]

*U.S. Patent No. 2,390,847 , 12/11/1945 (app. 08/13/1941) SIGNAL TRANSLATING APPARATUS (Underwater Microphone) (class: 181/142; 333/32; 367/172; 367/174) Olson, Harry F. (assignee: Radio Corporation of America) [abstract] [DjVu116KB]

*U.S. Patent No. 2,511,663 , 06/13/1950 (app: 12/29/1945 - serial: 638,378) MAGNETIC PHONOGRAPH PICKUP (class: 369/149; 310/25; 336/135; 369/170) Bachman, William S. of Southport, CT (assignee: General Electric Company of New York) [DjVu191KB]

*U.S. Patent No. 2,537,141, 05/09/1951 (app. 06/15/1945, serial 599,642) LOUD-SPEAKER HORN (class: 181/187; 181/188; 181/191) Klipsch, Paul W. of Hope, Arkansas [DjVu172KB]

*U.S. Patent No. 2,612,558 , 09/30/1952 Crossover Filter Network Klipsch, Paul W. [abstract] [DjVu111KB]

*U.S. Patent No. 2,699,332 , 01/11/1955 (app.11/13/1951, serial: 255,917) MEANS FOR ACTUATING AN ENDLESS TAPE OR THE LIKE (class: 242/326.3; 242/327; 352/128; 360/93; 360/132; D19/68) MacKenzie, Louis G. of Monrovia, CA (assignee: Magna Electronics Co. of Los Angeles, CA) [Pt-OCR39KB] [DjVu196KB]

*U.S. Patent No. 2,713,396 , 07/19/1955 (app. 05/24/1950) NOVEL, SMALL, EXTENDED LOW FREQUENCY (class: 181/199, 181/163) Tavares, Ernest A. [abstract] [DjVu167KB]

*U.S. Patent No. 2,718,931 , 09/27/1955 (app. 11/28/1952) LOUD SPEAKER FOR OUTDOOR THEATERS (class: 181/31) Boudouris, Angelo [abstract] [DjVu66KB]

*U.S. Patent No. 2,727,949 , 12/20/1955 Loudspeaker Lokkesmoe, Julius B [abstract] [DjVu58KB]

*U.S. Patent No. 2,797,766 ,  07/02/1957 (app. 10/20/1953) LOUD SPEAKER (class: 181/151; 181/152; 381/345) Sullivan, Herbert W. (assignee: David Bogen & Company, Inc.) [abstract] [DjVu94KB]

*U.S. Patent No. 2,821,639 , 01/28/1958 (app. 10/28/1954, serial 465,322) TRANSISTOR SWITCHING CIRCUITS (class: 327/423; 318/294; 327/484; 327/576; 327/588; 330/263; 331/113A; 361/245; 363/63) Bright, Richard L. of Hempfield Township, PA and Royer, George H. of Pittsburgh, PA (assignee: Westinghouse Electric Corporation of East Pittsburgh, PA) [DjVu119KB] [Comments]

*U.S. Patent No. 2,864,897 , 12/16/1958 (app: 02/17/1958 - serial: 715,683) UNIVERSAL PHONOGRAPH PICKUP HEAD OR THE LIKE (class: 369/136; 369/91; 369/134; 369/149; 369/173) Kaar, Ira J. of Los Angeles, CA (assignee: Hoffman Electronics Corporation of California) [DjVu97KB]

*U.S. Patent No. 2,873,318 , 02/10/1959 (app. 11/25/1953, serial 394,260) MAGNETIC RECORDER (class: 360/90; 242/352.2; 242/352.5; 318/760; 360/130.32) Moore, Clarence C. of Elkhart, IN [DjVu186KB] [Comments]

*U.S. Patent No. 3,059,719 , 10/23/1962 (app. 11/17/1958) SPEAKER ENCLOSURE (class: 181/199) Arden, David [abstract] [DjVu69KB]

*U.S. Patent No. 3,126,162 , 03/24/1964 (app. 12/24/1958, serial: 782,836) ACTUATING MECHANISM FOR ENDLESS TAPE CARTRIDGES (class: 242/326.1; 226/110; 226/181; 360/69; 360/92) MacKenzie, Louis G. of Inglewood, CA [Pt-OCR49KB] [DjVu274KB]

*U.S. Patent No. 3,142,729 , 17/28/1964 (app. 12/10/1957 - serial: 701,872) PHONOGRAPH REPRODUCER (class: 369/139; 369/170) Davis, Charles C. of Los Angeles, CA (assignee: Litton Systems, Inc. of Maryland) [DjVu130KB]

*U.S. Patent No. 3,299,219 , 01/17/1967 (app: 04/08/1963 - serial: 271,379) STEREOPHONIC TRANSDUCER CARTRIDGE (class:369/139) Madsen, Erik Markvard Christopher Rorback of Gimsingehoje, Struer, Denmark (assignee: A/S Bang & Olufsen of Produktiousselskah, Struer, Denmark) [DjVu217KB]

*U.S. Patent No. 3,302,748 , 02/07/1967 (app. 04/11/1963) LOUDSPEAKER SYSTEM (class: 181/31) Reed, Prentiss B. [abstract] [DjVu320KB]

*U.S. Patent No. 3,319,175 , 05/09/1967 (app. 07/27/1964, serial 385,530) ELECTRONIC AMPLIFIER WITH POWER SUPPLY SWITCHING (class: 330/297; 327/535; 327/576; 330/123; 330/127; 330/263) Dryden, Hugh L, Deputy Admininistrator of the National Aeronautics and Space Administration, with respect to an invention of Kramer, Manuel of South Lincoln, MA [DjVu165KB] [Comments]

*U.S. Patent No. 3,329,236 , 07/04/1967 (app. 06/03/1966) SPEAKER ENCLOSURE (class: 181/199; 52/288.1) Arden, David [abstract] [DjVu61KB]

*U.S. Patent No. 3,457,370 , 07/22/1969 Impedance Correcting Networks Charles Paul Boner (assignee C.P. Boner and Associates) [abstract] [DjVu72KB]

*U.S. Patent No. 3,493,879 , 02/03/1970 (app. 02/12/1968, serial 704,625) HIGH POWER HIGH FIDELITY SOLID STATE AMPLIFIER (class: 330/255; 330/260; 330/267; 330/298) Stanley, Gerald R. of Mishawaka, IN (assignee: International Radio & Electronics Corporation of Elkhart, IN) (Crown International) [DjVu113KB] [Comments]

*U.S. Patent No. 3,498,570 , 03/03/1970 (app. 07/31/1967, serial 657,168) DIFFERENTIAL BRAKING SYSTEM FOR REELING APPARATUS (class: 242/412.1; 242/414.1; 242/422.3; 318/7) Scholfield, Max W. of Goshen, IN (assignee: International radio & Electronics Corporation of Elkhart, IN) (Crown International) [DjVu81KB] [Comments]

*U.S. Patent No. 3,554,313 , 01/12/1971 (app. 11/20/1968) LOUDSPEAKER SYSTEMS (class 181/31) Young, Richard Owen [abstract] [DjVu110KB]

*U.S. Patent No. 3,585,517 , 06/15/1971 (app. 05/01/1968, serial 725,852) HIGH-EFFICIENCY POWER AMPLIFIER (class: 330/10; 330/117; 330/151; 330/297; 332/110) Herbert, Roger B. of Williamsville, NY (assignee: Westinghouse Electric Corporation of Pittsburgh, PA) [DjVu106KB] [Comments]

* U.S. Patent No. 3,624,298, 11/30/1971: Sound Improving Means and Method Davis, Arthur C.; Davis, Donald B.; Noble, James J. Assignee: LTV Ling Altec, Inc. [abstract] [DjVu256KB]

*U.S. Patent No. 3,679,843 , 07/25/1972 (app: 01/04/1971 - serial: 103,438) MOVING COIL TYPE PHONOGRAPH PICKUP CARTRIDGE (class: 369/146; 369/172 - international: H04r 9/16) Cho, Masanobu of Tokyo, Japan (assignee: Micro Seiki Co., Ltd. of Tokyo, Japan) [DjVu103KB]

*U.S. Patent No. 3,681,618 , 08/01/1972 RMS Circuits with Bipolar Logarithmic Converter Blackmer, David E., [abstract] [DjVu110KB]

* U.S. Patent No. 3,714,462, 01/30/1973: Multiplier Circuits Blackmer, David E. [abstract] [DjVu82KB]

*U.S. Patent No. 3,720,796 , 03/13/1973 (app: 08/04/1971 - serial: 169,039) MULTICHANNEL PICKUP CARTRIDGE (class: 369/139; 369/161 - international: H04r 11/12) Honma, Kimiyasu of Tokyo, Japan (assignee: Kabushiki Kaisha Audio-Technica of Tokyo, Japan) [DjVu150KB]

*U.S. Patent No. 3,729,596 , 04/24/1973 (app: 04/24/1971 - serial: 137,817) ELECTRODYNAMIC SOUND PICKUP OR SOUND-TRACK CUTTING DEVICE (class: 369/139 - international: H04r 9/16) Toth, Miklos of Lubeck, Germany (assignee: Wilms, Hermann of Lubeck, Germany) [DjVu82KB]

*U.S. Patent No. 3,732,370 , 02/24/1971: Equalizer Using a Comb of Spectral Frequencies as the Test Signal Sacks, Jack Assignee: United Recording Electronic Industries (U.R.E.I.) [abstract] [DjVu207KB]

*U.S. Patent No. 3,750,044 , 07/31/1973 (app. 05/22/1972, serial 255,428) GRAPHIC EQUALIZER CIRCUIT (class: 330/126; 330/107; 330/151; 333/28R; 333/28T; 381/103; 434/262) Stanley, Gerald R. of Mishawaka, IN (assignee: International Radio & Electronics Corporation of Elkhart, IN) (Crown International) [DjVu108KB] [Comments]

*U.S. Patent No. 3,755,749 , 08/28/1973 (app. 11/22/1971) Sound Reenforcement Equalization System Van Ryswyk, Carl Wayne and Boner, Charles Paul (assignee White Instruments, Inc.) [abstract] [DjVu112KB]

*U.S. Patent No. 3,761,647 , 09/25/1973 (app: 08/13/1969 - serial: 849,767) CARTRIDGE FOR DETECTING VIBRATIONS REPRESENTING STEREOPHONIC SOUND (class: 179/100.41 K, 274/37 - international: H04r 11/12) Nemoto, Mitsuo of Tokyo, Japan and Honma, Kimiyasu of Tokyo, Japan (assignee: Kabushiki Kaisha Audio-Technica of Tokyo, Japan) [DjVu188KB]

*U.S. Patent No. 3,808,545 , 04/30/1974 (app. 10/04/1972, serial 294,861) HIGH POWER BRIDGE AUDIO AMPLIFIER (class: 330/265; 330/297; 330/298) Stanley, Gerald R. of Mishawaka, IN (assignee: International Radio & Electronics Corporation of Elkhart, IN) (Crown International) [DjVu209KB] [Comments]

*U.S. Patent No. 3,838,215 , 09/24/74 Speakers and crossover circuit Haynes, Edward N. Jr. [abstract] [DjVu108KB]

U.S. Patent No. 3,967,367, 07/06/1976 (app. 10/14/1975, serial 621,963) METHOD FOR ALIGNING LOUDSPEAKER DIAPHRAGM AND VOICE COIL ASSEMBLY (class: 29/594; 29/464; 29/606, international: H04R 031/00) Hayes, William L. of Anaheim, CA and Siciliano, Jerry A. of Anaheim, CA (assignee: Altec Corporation of Anaheim, CA) [Pt-Txt20KB] [DjVu*97KB]

U.S. Patent No. 3,980,964, 09/14/1976 (app. 06/20/1975, serial 588,604) NOISE REDUCTION CIRCUIT (class: 330/278; 330/59; 330/136; 330/141; 330/144; 330/149, international: H03G 003/30) Grodinsky; Robert M. of Skokie, IL [Pt-Txt43KB] [DjVu135KB]

U.S. Patent No. 3,983,335, 09/28/1976 (app: 10/23/1974, serial: 517,044) STYLUS ASSEMBLY AND TRANSDUCER USING SAME (class: 369/136; 369/149; 369/170 - international: H04R 011/12) Nemoto, Mitsuo of Machida, Japan (assignee: Kabushiki Kaisha Audio-Technica of Machida, Japan) [Pt-Txt40KB] [DjVu64KB*]

U.S. Patent No. 3,987,342, 10/19/1976 (app. 11/24/1975, serial 634,789) PROTECTIVE CIRCUIT UTILIZING MULTILEVEL POWER SUPPLY OUTPUT (class: 361/106; 307/86; 330/207P; 330/289; 330/298; 361/75, international: H02H 007/20; H02H 005/04) Bird, Robert J. of Citrus Heights, CA and Rumbaugh, Paul S. of Santa Ana, CA (assignee: Altec Corporation of Anaheim, CA) [Pt-Txt30KB] [DjVu*95KB]

U.S. Patent No. 3,991,286, 11/09/1976 (app. 06/02/1975, serial 582,999) HEAT DISSIPATING DEVICE FOR LOUDSPEAKER VOICE COIL (class: 381/189; 381/400; 381/404, international: H04R 009/04; H04R 009/06) Henricksen, Clifford A. of Yorba Linda, CA (assignee: Altec Corporation of Anaheim, CA) [Pt-Txt20KB] [DjVu*92KB]

U.S. Patent No. 3,992,585, 11/16/1976 (app. 10/06/1975, serial 620,537) SELF-ENERGIZING ELECTROSTATIC LOUDSPEAKER SYSTEM (class: 381/110; 381/116; 381/191, international: H04R 003/00) Turner; Jacob C. of Milwaukee, WI and Elliott, Douglas M. of Milwaukee, WI and Grodinsky; Robert M. of Skokie, IL and Mills, Thomas F. of Chicago, IL (assignee: Koss Corporation of Milwaukee, WI) [Pt-Txt26KB] [DjVu135KB]

U.S. Patent No. 4,050,541, 09/27/1977 (app. 04/21/1976, serial 678,873) ACOUSTICAL TRANSFORMER FOR HORN-TYPE LOUDSPEAKER (class: 181/159; 181/185, international: G10K 011/06) Henricksen, Clifford A. of Yorba Linda, CA (assignee: Altec Corporation of Anaheim, CA) [Pt-Txt30KB] [DjVu*81KB]

U.S. Patent No. 4,075,418, 02/21/1978 (app: 05/23/1975 - serial: 580,159) STEREOPHONIC PICKUP CARTRIDGE (class: 369/139; 369/147; 369/170 - international: H04R 011/12) Nemoto, Mitsuo of Machida, Japan and Honma, Kimiyasu of Kokubunji, Japan (assignee: Kabushiki Kaisha Audio-Technica of Machida, Japan) [Pt-Txt60KB] [DjVu151KB*]

U.S. Patent No. 4,078,215, 03/07/1978 (app. 11/26/1976, serial 745,448) ELECTRONIC FILTER CIRCUIT (class: 333/174; 330/103; 330/108; 330/109 - international: H03H 007/10; H03H 007/14; H03F 001/32; H03G 009/20) Vinson, Billy Herman of Simi Valley, CA (assignee: Altec Corporation of Anaheim, CA) [PtTxt14KB] [DjVu*40KB]

U.S. Patent No. 4,081,757, 03/28/1978 (app: 11/19/1976, serial: 743,525) PARALLEL POWER AMPLIFIER CIRCUITS (class: 330/124R; 330/84; 330/295 - international: H03F 003/68) Rumbaugh, Paul S. of Santa Ana, CA (Assignee: Altec Corporation of Anaheim, CA) [PtTxt11KB] [DjVu*58KB]

U.S. Patent No. 4,088,835, 05/09/1975 Comprehensive feedback elimination system employing notch filter Thurmond, George R and Heinz, Harro K Assignee: Rauland-Borg Corporation [abstract] [DjVu216KB]

U.S. Patent No. 4,118,601, 10/03/1978 System and a method for equalizing an audio sound transducer system Yeap, Arthur K. C. Assignee: Audio Developments International [abstract] [DjVu77KB]

U.S. Patent No. 4,122,508, 10/24/1978 (app: 09/06/1977 - serial: 831,066) MODULAR PRINTED CIRCUIT BOARD ASSEMBLY HAVING COOLING MEANS INCORPORATED THEREIN (class: 361/697; 165/80.3; 165/166; 361/796; D23/370 - international: H05K 007/20) Rumbaugh, Paul S. of Garden Grove, CA (assignee: Altec Corporation of Anaheim, CA) [PtTxt18KB] [DjVu*146KB]

U.S. Patent No. 4,123,010, 10/31/1978 (app. 01/02/1975, serial 537,936) ADAPTER HUB FOR A REEL (class: 242/597.1, international: B65H 017/02) Eger, Donald M. of Elkhart, IN (assignee: International Radio & Electronics, Inc. of Elkhart, IN) (Crown International) [PtTxt44KB] [DjVu*99KB] [Comments]

U.S. Patent No. 4,124,783, 11/07/1978 (app: 03/31/1977 - serial: 783,403) PHONOGRAPHIC PICKUP (class: 369/139 - international: H04R 009/16) Nemoto, Mitsuo of Machida, Japan (assignee: Kabushiki Kaisha Audio-Technica of Tokyo, Japan) [Pt-Txt40KB] [DjVu73KB*]

U.S. Patent No. 4,130,023, 12/19/1978 (app: 12/27/1977 - serial: 864,738) METHOD AND APPARATUS FOR TESTING AND EVALUATING LOUDSPEAKER PERFORMANCE (class: 73/647 - international: G01M 019/00) Henricksen, Clifford A. of Yorba Linda, CA (assignee: Altec Corporation of Anaheim, CA) [PtTxt20KB] [DjVu*69KB]

U.S. Patent No. 4,138,594, 02/06/1979 (app. 06/02/1977) Small dimension low frequency folded exponential horn loudspeaker with unitary sound path and loudspeaker system including same (class: 381/335; 181/147; 181/152; 381/99; 381/340; 381/341) Klipsch; Paul W. (assignee: Klipsch and Associates, Inc.) [abstract] [DjVu209KB]

U.S. Patent No. 4,155,047, 05/15/1979: Voltage controlled attenuator Rubens, Harvey A. and Baskind, David L. [abstract] [DjVu153KB]

U.S. Patent No. 4,158,820, 06/19/1979 (app. 02/01/1978, serial 874,040) LOW LEVEL PREAMPLIFIER CIRCUIT (class: 330/149; 330/265; 330/267; 330/294; 330/304 - international: H03F 001/26; H03F 003/183) Stanley, Gerald R. of Mishawaka, IN (assignee: Crown International, Inc. of Elkhart, IN) [Pt-Txt40KB] [DjVu69KB*]

U.S. Patent No. 4,162,457, 07/24/1979 (app. 12/30/1977, serial 866,021) EXPANSION CIRCUIT FOR IMPROVED STEREO AND APPARENT MONAURAL IMAGE (class: 330/295; 330/124R; 330/278; 333/14; 381/28; 381/107 - international: H03F 003/68) Grodinsky, Robert M. of Skokie, IL 60076 [Pt-Txt39KB] [DjVu144KB]

U.S. Patent No. 4,176,731, 12/04/1979 (app: 11/21/1977 - serial: 853,204) TWO-SECTION EXPONENTIAL ACOUSTICAL HORN (class: 181/192; 181/187 - international: G10K 011/00) Sinclair, Rex of Garden Grove, CA (assignee: Altec Corporation of Anaheim, CA) [PtTxt14KB] [DjVu*56KB]

U.S. Patent No. 4,180,710, 12/25/1979 (app: 08/24/1978 - serial: 936,484) ADJUSTABLY POSITIONED PHASING PLUG (class: 381/343; 29/594 - international: H04R 009/06; H04R 031/00) Spranger, Paul B. of Fullerton, CA (assignee: Altec Corporation of Anaheim, CA) [PtTxt15KB] [DjVu*92KB]

U.S. Patent No. 4,180,780, 12/25/1979 (app: 10/02/1978 - serial: 947,629) INPUT DECOUPLING CIRCUIT FOR TRANSISTOR DIFFERENTIAL AMPLIFIER (class: 330/252; 330/69; 330/207P; 330/260; 330/295; 330/298 - international: H03F 003/45) Rumbaugh, Paul S. of Garden Grove, CA (assignee: Altec Corporation of Anaheim, CA) [PtTxt15KB] [DjVu*64KB]

U.S. Patent No. 4,187,926, 02/12/1980 (app: 12/08/1978 - serial: 967,739) LOUDSPEAKER HORN (class: 181/192; 181/187; 181/190 - international: G10K 011/00) Henricksen, Clifford A. of Yorba Linda, CA and Ureda, Mark S. of Woodland Hills, CA (assignee: Altec Corporation of Anaheim, CA) [PtTxt19KB] [DjVu*124KB]

U.S. Patent No. 4,195,267, 03/25/1980 (app. 11/06/1978, serial 957,682) LOW-LEVEL PREAMPLIFIER CIRCUIT (class: 330/265; 330/149; 330/267; 330/294; 330/302; 330/311 - international: H03F 001/26; H03F 001/183) Stanley, Gerald R. of Mishawaka, IN (assignee: Crown International, Inc. of Elkhart, IN) [Pt-Txt40KB] [DjVu94KB*]

U.S. Patent No. 4,198,540, 04/15/1980 Compensated crossover network Cizek, Fred R. (assignee Cizek Audio Systems, Inc.) [abstract] [DjVu93KB]

U.S. Patent No. 4,225,794, 09/30/1980: Voltage controlled amplifier Buff, Paul C. [abstract] [DjVu102KB]

U.S. Patent No. 4,234,804, 11/18/1980: Signal correction for electrical gain control systems Bergstrom, Gary (assignee dbx, Inc.) [abstract] [DjVu198KB]

U.S. Patent No. 4,276,446, 06/30/1981 (app. 10/05/1979) Acoustic transducer system (class: 381/335; 181/145; 181/163; 381/182; 381/345; 381/351) Taddeo; Anthony R. [abstract] [DjVu40KB]

U.S. Patent No. 4,296,278, 10/20/1981 (app: 01/05/1979 - serial: 001,307) LOUDSPEAKER OVERLOAD PROTECTION CIRCUIT (class: 381/55; 327/319; 340/661; 361/93.9 - international: H04R 003/00; H03K 005/08) Cullison, Steven B. of Garden Grove, CA and Slack, Charles B. of Costa Mesa, CA (assignee: Altec Corporation of Anaheim, CA) [PtTxt26KB] [DjVu*76KB]

U.S. Patent No. 4,312,060, 01/19/1982 (app. 04/26/1979, serial 033,380) PREAMPLIFIER FOR PHONOGRAPH PICKUP (class: 369/134; 330/302; 369/88 - international: G11B 003/00; G11B 003/74; H03F 003/04) Grodinsky; Robert of Skokie, IL [Pt-Txt36KB] [DjVu119KB]

U.S. Patent No. 4,315,102 02/09/1982 Speaker cross-over networks Eberbach; Steven J. [abstract] [DjVu130KB]

U.S. Patent No. 4,321,554, 03/23/1982 (app. 01/14/1980, serial 111,687) TIME-DELAYED, VARIABLE OUTPUT CURRENT LIMITING MEANS FOR POWER AMPLIFIERS (class: 330/298; 330/297, international: H03F 003/04) Quilter, Patrick H. of Laguna Beach, CA (assignee: QSC Audio Products, Inc. of Costa Mesa, CA) [Pt-Txt50KB] [DjVu*106KB]

U.S. Patent No. 4,325,456, 04/20/1982 (app: 10/10/1980 - serial: 196,074) ACOUSTICAL TRANSFORMER FOR COMPRESSION-TYPE LOUDSPEAKER WITH AN ANNULAR DIAPHRAGM (class: 181/159; 181/185 - international: G10K 011/02) Ureda. Mark S. of Woodland Hills, CA (assignee: Altec Corporation of Anaheim, CA) [PtTxt18KB] [DjVu*93KB]

U.S. Patent No. 4,330,809, 05/18/1982 (app. 12/31/1979, serial 108,585) THERMAL PROTECTION CIRCUIT FOR THE DIE OF A TRANSISTOR (class: 361/103; 361/79; 374/134 - international: H02H 005/04) Stanley, Gerald R. of Mishawaka, IN (assignee: Crown International, Inc. of Elkhart, IN) [Pt-Txt40KB] [DjVu61KB*]

U.S. Patent No. 4,331,931, 05/25/1982: Gain control systems Adams, Robert W. (assignee dbx, Inc.) [abstract] [DjVu126KB]

U.S. Patent No. 4,336,425, 06/22/1982 (app. 05/06/1980, serial 147,180) HIGH FREQUENCY COMPRESSION DRIVER AND METHOD OF MANUFACTURE THEREOF (class: 381/403; 29/594, international: H04R 009/02; H04R 009/04; H04R 009/06; H04R 031/00) Renkus, Jonas A. of Santa Ana, CA (assignee: Renkus-Heinz, Inc. of Irvine, CA) [PtTxt44KB] [DjVu*156KB]

U.S. Patent No. 4,341,962,  07/27/1982: Electronic gain control device Buff, Paul C. [abstract] [DjVu143KB]

U.S. Patent No. 4,344,504, 08/17/1982 (app. 03/27/1981, serial 248,504) DIRECTIONAL LOUDSPEAKER (class: 181/187; 181/192, international: G10K 011/02) Howze, Bruce of Springfield, PA (assignee: Community Light & Sound, Inc. of Philadelphia, PA) [Pt-Txt40KB] [DjVu*164KB]

U.S. Patent No. 4,361,736, 11/30/1982 (app. 12/07/1979, serial 101,113) PRESSURE RECORDING PROCESS AND DEVICE (class: 381/361; 181/155; 381/360, international: H04R 001/20) Long, Edward M. of Oakland, CA 94602 and Wickersham, Ronald J. of Santa Rosa, CA [PtTxt40KB] [DjVu*93KB]

U.S. Patent No. 4,364,120 , 12/14/1982 (app. 09/24/1979, serial 078136) PICKUP CARTRIDGE OF MOVING COIL TYPE FOR PHONOGRAPH (class: 369/138; 369/147 international: H04R 009/04; H04R 009/16) Honma, Kimiyasu of Machida, Japan (assignee: Kabushiki Kaisha Audio-Technica of Tokyo, Japan) [PtTxt40KB] [DjVu*110KB]

U.S.Patent No. 4,387,352, 06/07/1983 (app. 03/03/1980) Transducer array crossover network Routh, Claude C. (assignee The United States of America as represented by the Secretary of the Navy) [abstract] [DjVu100KB]

target='_blank'U.S. Patent No. 4,390,078 , 06/28/1983 (app. 02/23/1982, serial 351,439) LOUDSPEAKER HORN (class: 181/185; 181/188; 181/190; 181/192, international: G10K 011/00) Howze, Bruce of Springfield, PA and Henrickson, Clifford of Wallingford, PA (assignee: Community Light & Sound, Inc. of Philadelphia, PA) [Pt-Txt5KB] [DjVu*73KB]

U.S. Patent No. 4,403,199 , 09/06/1983: Gain control systems Blackmer, David E. (assignee dbx, Inc.) [abstract] [DjVu179KB]

U.S. Patent No. 4,410,064, 10/18/1983 (app. 01/27/1982) Bass response speaker housing and method of tuning same (class: 181/152; 181/156) Taddeo, Anthony R. [abstract] [DjVu62KB]

U.S. Patent No. 4,421,949, 12/20/1983 Electroacoustic network Eberbach; Steven J. [abstract] [DjVu179KB]

U.S. Patent No. 4,454,433 , 06/12/1984: Multiplier circuit Welland, David R. (assignee dbx, Inc.) [abstract] [DjVu100KB]

U.S. Patent No. 4,481,662, 11/06/1984 (app. 01/07/1982, serial 337,787) METHOD AND APPARATUS FOR OPERATING A LOUDSPEAKER BELOW RESONANT FREQUENCY (class: 381/98; 333/28T; 381/103, international: H03G 005/00) Long, Edward M. of Oakland, CA and Wickersham, Ronald J. of Santa Rosa, CA [PtTxt44KB] [DjVu*73KB]

U.S. Patent No. 4,481,663, 11/06/1984 (app: 05/16/1983 - serial: 494,137) NETWORK FOR USE WITH PIEZOCERAMIC TRANSDUCER (class: 381/98; 333/177; 381/116; 381/190 - international: H04R 003/00) Spranger, Paul B. of Fullerton, CA (assignee: Altec Corporation of Anaheim, CA) [PtTxt22KB] [DjVu*52KB]

U.S. Patent No. 4,483,015, 11/13/1984 Compensation network for loudspeakers Strohbeen, John [abstract] [DjVu73KB]

U.S. Patent No. 4,500,850, 02/19/1985 (app. 10/22/1981, serial 313,658) AUDIO AMPLIFIER APPARATUS WITH MINIMUM NON-LINEAR DISTORTION (class: 330/307; 330/66 - international: H03F 003/04) Grodinsky; Robert of Skokie, IL [Pt-Txt38KB] [DjVu128KB]

U.S. Patent No. 4,508,941, 04/02/1985 (app. 10/28/1982, 437,258) VOICE COIL CENTERING AND SUSPENSION FOR VENTED POLE PIECE (class: 381/405; 381/412, international: H04M 002/02) Wiggins; John T. of Philadelphia, PA (assignee: Community Light & Sound Inc. of Chester, PA) [Pt-Txt40KB] [DjVu*112KB]

U.S. Patent No. 4,539,708, 9/3/1985 (app: 7/1/1983, serial: 511,360) EAR RADIO (class: 455/500; 455/100; 455/232.1; 455/351, international: H04B 007/00; H04B 001/08) Norris, Elwood G. of Salt Lake City, UT (assignee: American Technology Corporation of Salt Lake City, UT) [PtTxt39KB] [DjVu*101KB]

U.S. Patent No. 4,560,947 , 12/24/1985: Monolithic voltage controlled element Frey, Douglas R. [abstract] [DjVu220KB]

U.S. Patent No. 4,571,554 , 02/18/1986 (app: 10/20/1983, serial 543,923) BALANCED AMPLIFIER DEVICE (class: 330/252; 330/171; 330/297 - international: H03F 003/45) Martin, Hardison G. of Louisville, KY and Ponto, Robert of Louisville, KY (assignee: Innovative Electronic Designs, Inc. of Louisville, KY) [PtTxt44KB] [DjVu*55KB]

U.S. Patent No. 4,583,245, 04/15/1986 (app. 06/14/1984, serial 620,512) SPEAKER SYSTEM PROTECTION CIRCUIT (class: 381/59; 381/96; 381/100, international: H04R 029/00) Gelow, William J. of Placentia, CA and Murphy, James of San Rafael, CA (assignee: Renkus-Heinz, Inc. of Irvine, CA) [PtTxt60KB] [DjVu*186KB]

U.S. Patent No. 4,594,561, 06/10/1986 (app. 10/26/1984, serial 665,049) AUDIO AMPLIFIER WITH RESISTIVE DAMPING FOR MINIMIZING TIME DISPLACEMENT DISTORTION (class: 330/297; 330/149 - international: H03F 001/30) Grodinsky, Robert M. of Skokie, IL and Cornwell, David G. of Chicago, IL [Pt-Txt33KB] [DjVu111KB]

U.S. Patent No. 4,597,100, 06/24/1986 Ultra high resolution loudspeaker system Grodinsky; Robert M. and Cornwell; David G. (assignee RG Dynamics, Inc.) [abstract] [DjVu149KB]

U.S. Patent No. 4,604,719, 08/05/1986 (app. 10/21/1983, serial 544,280) OSCILLATOR HAVING A SIXTEEN BIT SIGNAL GENERATION UTILIZING AN EIGHT BIT PROCESSOR (class: 708/276; 708/8 - international: G06F 001/02; G06F 015/31; G03B 019/00) Stanley, Gerald R. of Mishawaka, IN (assignee: Crown International, Inc. of Elkhart, IN) [Pt-Txt40KB] [DjVu107KB*]

U.S. Patent No. 4,606,071, 08/12/1986 Loudspeaker system utilizing an equalizer circuit White, Lahroy A. Jr. [abstract] [DjVu83KB]

U.S. Patent No. 4,823,093 , 04/18/1989: Dynamically biased voltage controlled element Frey, Douglas R. [abstract] [DjVu233KB]

U.S. Patent No. 4,837,829, 06/06/1989: Acoustic sound system for a room Lobb, William E. (assignee Jaffe Acoustics, Inc.) [abstract] [DjVu97 KB]

U.S. Patent No. 4,837,837, 06/06/1989 (app. 11/05/1987) Loudspeaker (class: 381/346; 181/146; 181/151; 381/349) Taddeo, Anthony R. [abstract] [DjVu53KB]

U.S. Patent No. 4,882,664, 11/21/1989 (App. 06/08/1988) Synchronous modulation circuit Pennington, Terris L. (assignee Rane Corporation) [abstract] [DjVu137KB]

U.S. Patent No. 4,887,298, 12/12/1989 (app. 06/15/1988, serial 207,064) ELECTRONIC CIRCUIT FOR SENSING DISCONNECT OR FAILURE OF A POWER OUTPUT SENSE LINE IN AN AUDIO POWER SYSTEM (class: 381/55; 330/207P; 330/298; 381/59; 381/96, international: H03G 011/00) Haigler, Robert M. of Laguna Beach, CA (assignee: Renkus-Heinz of Irvine, CA) [PtTxt74KB] [DjVu*154KB]

U.S. Patent No. 4,891,841, 01/02/1990 (app. 02/22/1988) Reciprocal, subtractive, audio spectrum equalizer Bohn, Dennis A. (assignee Rane Corporation) [abstract] [DjVu146KB]

U.S. Patent No. 5,029,299, 07/02/1991 (app: 05/09/1990 - serial: 521,122) POWER AMPLIFIER WITH CURRENT LIMITING MEANS (class: 330/298; 330/207P - international: H03F 001/42) Rodgers, Robert L. of Oklahoma City, OK (assignee: Altec Lansing Corporation of Oklahoma City, OK) [PtTxt30KB] [DjVu*77KB]

U.S. Patent No. 5,046,105, 09/03/1991 (app. 04/30/1990) Audio signal equalizer having accelerated slope phase shift compensated filters Bohn, Dennis A. (assignee Rane Corporation) [abstract] [DjVu196KB]

U.S. Patent No. 5,070,530, 12/03/1991 (app. 03/25/1988, serial  173,435) ELECTROACOUSTIC TRANSDUCERS WITH INCREASED MAGNETIC STABILITY FOR DISTORTION REDUCTION (class: 381/422; 381/412; 381/421 - international: H04R 025/00) Grodinsky, Robert of Skokie, IL and Cornwell, David G. of Chicago, IL [Pt-Txt35KB] [DjVu123KB]

U.S. Patent No. 5,157,350 , 10/20/1992: Analog multipliers Rubens, Harvey [abstract] [DjVu378KB]

U.S. Patent No. 5,291,558, 03/01/1994 (app. 04/09/1992) Automatic level control of multiple audio signal sources Ross, Montgomery F. (assignee Rane Corporation) [abstract] [DjVu217KB]

U.S. Patent No. 5,313,663, 5/17/1994 (app: 5/8/1992, serial: 879,929) EAR MOUNTED RF RECEIVER (class: 455/351; 455/347; 455/350; D14/223, international: H04B 001/08) Norris, Elwood G. of Poway, CA (assignee: American Technology Corporation of Poway, CA) [PtTxt29KB] [DjVu*75KB]

U.S. Patent No. 5,357,587, 10/18/1994 (app. 12/23/1992, serial 995,833) DISTORTION REDUCTION IN LOUDSPEAKERS (class: 381/414 - international: H04R 025/00) Grodinsky, Robert M. of Skokie, IL and Cornwell, David G. of Chicago, IL [Pt-Txt31KB] [DjVu146KB]

U.S. Patent No. 5,386,474, 01/31/1995 (app. 08/17/1993, serial 108,092) AMPLIFIER-SPEAKER INTERFACE CORRECTION CIRCUIT (class: 381/28; 381/93; 381/94.9; 381/300 - international: H04R 025/00) Grodinsky, Robert M. of Skokie, IL and Cornwell, David G. of Chicago, IL [Pt-Txt23KB] [DjVu109KB]

U.S. Patent No. 5,402,500 , 03/28/1995 (app: 07/14/1993 - serial: 91317) ADAPTIVE PROPORTIONAL GAIN AUDIO MIXING SYSTEM (class: 381/119; 381/108 - international: H04B 001/00) Sims, Travis M. Jr. of Rio Rancho, NM (assignee: Lectronics, Inc. of Rio Rancho, NM) [Pt-Txt40KB] [DjVu61KB*]

U.S. Patent No. 5,436,882, 07/25/1995 (app. 01/04/1993) Method and device for improving digital audio sound (class: 369/124.13; 341/118; 360/8) Taddeo, Anthony R. [abstract] [DjVu82KB]

U.S. Patent No. 5,450,034, 09/12/1995: Reflected plate amplifier Donn Werrbach (assignee Aphex Systems Ltd.) [abstract] [DjVu118KB]

U.S. Patent No. 5,509,080, 04/16/1996 (app. 03/14/1994, serial 208,898) BASS CLIPPING CIRCUIT (class: 381/98; 333/28T, international: H03G 005/00; H04S 003/00) Roberts, John H. of Hickory, MS (assignee: Peavey Electronics Corporation of Meridian, MS) [Pt-Txt18KB] [DjVu72KB]

U.S. Patent No. 5,524,055, 06/04/1996 (app. 01/18/1994, serial 182,493) SOLID STATE CIRCUIT FOR EMULATING TUBE COMPRESSION EFFECT (class: 381/61, international: H03G 003/08) Sondermeyer, Jack C. of Meridian, MS (assignee: Peavey Electronics Corporation of Meridian, MS) [Pt-Txt28KB] [DjVu153KB]

U.S. Patent No. 5,568,560, 10/22/1996 (app. 05/11/1995) Audio crossover circuit (class: 381/99; 381/98) Combest; Christopher E. (assignee Multi Service Corporation) [abstract] [DjVu104KB]

U.S. Patent No. 5,586,194, 12/17/1996 (app. 03/31/1994, serial 220,356) AUGMENTATION AMPLIFIER (class: 381/120, international H03F 021/00) Risch, Jon M. of Toomsuba, MS (assignee: Peavey Electronics Corporation of Meridian, MS) [Pt-Txt33KB] [DjVu125KB]

U.S. Patent No. 5,606,142, 02/25/1997 (app. 06/30/1994, serial 269,112) SHELL RESONANT MEMBRANOPHONE (class: 84/411R, international G10D 013/02) Volpp, Steven of Meridian, MS (assignee: Peavey Electronics Corporation of Meridian, MS) [Pt-Txt46KB] [DjVu231KB]

U.S. Patent No. 5,619,578, 04/08/1997 (app. 09/02/1994, serial 299,104) MULTI-STAGE SOLID STATE AMPLIFIER THAT EMULATES TUBE DISTORTION (class: 381/61; 381/62, international: H03G 003/00) Sondermeyer, Jack C. of Vienna, MS and Brown, Sr., James W. of Meridian, MS (assignee: Peavey Electronics Corporation of Meridian, MS) [Pt-Txt40KB] [DjVu143KB]

U.S. Patent No. 5,647,004, 07/08/1997 (app. 01/10/1994, serial 179,546) MULTI-STAGE SOLID STATE AMPLIFIER THAT EMULATES TUBE DISTORTION (class: 381/61; 381/62, international: H03G 003/00) Sondermeyer; Jack C. of Meridian, MS and Brown, Sr.; James W. of Meridian, MS (assignee: Peavey Electronics Corporation of Meridian, MS) [Pt-Txt33KB] [DjVu125KB]

U.S. Patent No. 5,652,800, 07/29/1997 (app. 11/02/1995, serial 556,871) AUTOMATIC MIXER PRIORITY CIRCUIT (class: 381/119; 381/94.1; 381/122, international: H04B 001/00) Roberts; John H. of Hickory, MS (assignee: Peavey Electronics Corporation of Meridian, MS) [Pt-Txt20KB] [DjVu101KB]

U.S. Patent No. 5,663,684, 09/02/97: Wafer-stage adjustment for compensating for mismatches in temperature dependent IC components Herbert, Gary K. (assignee THAT Corp.); [abstract] [DjVu288KB]

U.S. Patent No. 5,668,499, 09/16/1997 (app. 01/16/1996, serial 586,596) TUBE TYPE POWER AMPLIFIER WITH DISTORTION CONTROL (class: 330/118; 330/136; 330/145; 330/149, international: H03F 003/28; H23G 003/22) Albert, James Robert of Meridian, MS and Sondermeyer; Jack C. of Meridian, MS (assignee: Peavey Electronics Corporation of Meridian, MS) [Pt-Txt20KB] [DjVu91KB]

U.S. Patent No. 5,675,656, 10/07/1997 (app. 07/15/1996, serial 668,501) POWER AMPLIFIER WITH CLIPPING LEVEL CONTROL (class: 381/61; 84/737; 84/738; 84/740; 381/63; 381/100, international: H03G 003/00) Sondermeyer, Jack C. of Meridian, MS and Brown, Sr., James W. of Meridian, MS (assignee: Peavey Electronics Corporation of Meridian, MS) [Pt-Txt50KB] [DjVu266KB]

U.S. Patent No. 5,722,041, 02/24/1998 (app: 12/05/1995 - serial: 567,559) HYBRID HOME-ENTERTAINMENT SYSTEM (class: 725/82; 348/552; 725/83 - international: H04N 007/00) Freadman, Tommyca of Goshen, NY (assignee: Altec Lansing Technologies, Inc. of Milford, PA) [PtTxt29KB] [DjVu*121KB]

U.S. Patent No. 5,737,428, 04/07/1998 (app. 08/18/1995, serial 516,776) CIRCUIT FOR PROVIDING VISUAL INDICATION OF FEEDBACK (class: 381/58; 381/98; 381/103, international: H04R 029/00) Roberts; John H. of Hickory, MS (assignee: Peavey Electronics Corporation of Meridian, MS) [Pt-Txt32KB] [DjVu*85KB]

U.S. Patent No. 5,750,943, 05/12/1998 (app. 10/02/1996, serial 720,623) SPEAKER ARRAY WITH IMPROVED PHASE CHARACTERISTICS (class: 181/152; 181/192, international: H05K 005/00) Heinz, Ralph D. of Corona, CA (assignee:  Renkus-Heinz, Inc. of Irvine, CA) [PtTxt30KB] [DjVu*158KB]

U.S. Patent No. 5,767,744, 06/16/1998 (app. 11/21/1996, serial 753,185) LIGHTWEIGHT FIXED FREQUENCY DISCONTINUOUS RESONANT POWER SUPPLY FOR AUDIO AMPLIFIERS (class: 330/297; 330/289; 330/298; 363/24, international: H03F 001/30) Irwin, Gordon L. of Bothell, WA and Quilter, Patrick H. of Laguna Beach, CA (assignee: QSC Audio Products, Inc. of Costa Mesa, CA) [Pt-Txt81KB] [DjVu*285KB]

U.S. Patent No. 5,796,305, 08/18/1998 (app. 06/14/1996, serial 663,691) AMPLIFIER ARRANGEMENTS WITH HIGH DAMPING FACTOR (class: 330/105; 330/109; 381/121, international: H03F 001/34) Sondermeyer; Jack C. of Meridian, MS (assignee: Peavey Electronics Corporation of Meridian, MS) [Pt-Txt33KB] [DjVu*114KB]

U.S. Patent No. 5,848,146, 12/08/1998 (app. 05/10/1996) Audio system for conferencing/presentation room Slattery, Ernest Michael (assignee Rane Corporation) [abstract] [DjVu416KB]

U.S. Patent No. 5,859,915, 1/12/1999 (app: 4/30/1997, serial: 846,637) LIGHTED ENHANCED BULLHORN (class: 381/75; 381/77; 381/82, international: H04R 027/04) Norris, Elwood G. of Poway, CA (assignee: American Technology Corporation) [PtTxt46KB] [DjVu*119KB]

U.S. Patent No. 5,885,129, 3/23/1999 (app: 3/25/1997, serial: 826,395) DIRECTABLE SOUND AND LIGHT TOY (class: 446/405; 446/473, international: A63H 005/04; A63H 033/30) Norris, Elwood G. of Poway, CA (assignee: American Technology Corporation of Poway, CA) [PtTxt50KB] [DjVu*69KB]

U.S. Patent No. 5,889,870, 3/30/1999 (app: 7/17/1996, serial: 684,311) ACOUSTIC HETERODYNE DEVICE AND METHOD (class: 381/77; 381/79, international: H04B 003/00) Norris, Elwood G. of Poway, CA (assignee: American Technology Corporation of Poway, CA) [PtTxt69KB] [DjVu*113KB]

U.S. Patent No. 5,937,072, 08/10/1999 (app. 03/03/1997) Audio crossover circuit (class: 381/99; 381/98) Combest, Christopher E. (assignee Multi Service Corporation) [abstract] [DjVu92KB]

U.S. Patent No. 5,982,905, 11/09/1999 (app. 01/22/1997, serial 787,122) DISTORTION REDUCTION IN SIGNAL PROCESSORS (class: 381/94.1; 381/394 - international: H04B 015/00) Grodinsky, Robert M. of Skokie, IL and Cornwell, David G. of Chicago, IL [Pt-Txt82KB] [DjVu215KB]

U.S. Patent No. 5,966,452, 10/12/1999 (app: 3/7/1997, serial: 814,717) SOUND REDUCTION METHOD AND SYSTEM FOR JET ENGINES (class: 381/71.1; 381/71.8, international: A61F 011/06; H03B 029/00) Norris, Elwood G. of Poway, CA (assignee: American Technology Corporation of Poway, CA) [PtTxt33KB] [DjVu*71KB]

U.S. Patent No. 6,011,855, 1/4/2000 (app: 3/17/1997, serial: 819,614) PIEZOELECTRIC FILM SONIC EMITTER (class: 381/111; 310/324; 310/328; 381/114; 381/173; 381/190, international: H04R 003/00) Selfridge, Alan R. of Los Gatos, CA and Khuri-Yakub, Pierre of Palo Alto, CA (assignee: American Technology Corporation of Poway, CA) [PtTxt52KB] [DjVu*89KB]

U.S. Patent No. 6,016,351, 1/18/2000 (app: 7/16/1997, serial: 895,486) DIRECTED RADIATOR WITH MODULATED ULTRASONIC SOUND (class: 381/77, international: H04B 003/00) Raida, Hans-Joachim of Cologne, DE and Bschorr, Oskar of Munich, DE (assignee: American Technology Corporation of Poway, CA) [PtTxt28KB] [DjVu*68KB]

U.S. Patent No. 6,023,193, 02/08/2000 (app.05/01/1998, serial 071,307) HIGH POWER BRIDGE AMPLIFIER (class: 330/255; 330/146, international: H03F 003/45) Ierymenko, Paul F. of Foothill Ranch, CA (assignee: QSC Audio Products, Inc. of Costa Mesa, CA) [Pt-Txt81KB] [DjVu*195KB]

U.S. Patent No. 6,044,160, 3/28/2000 (app: 1/13/1998, serial: 6,133) RESONANT TUNED, ULTRASONIC ELECTROSTATIC EMITTER (class: 381/191; 381/116; 381/174, international: H04R 025/00) Norris, Elwood G. of Poway, CA (assignee: American Technology Corporation of San Diego, CA) [PtTxt40KB] [DjVu*76KB]

U.S. Patent No, 6,059,069, 05/09/2000 (app. 08/25/1999 serial 382,817) LOUDSPEAKER WAVEGUIDE DESIGN (class: 181/152; 181/148; 181/157; 181/159; 181/175; 181/177; 181/182; 181/187; 181/192; 181/195; 381/337; 381/339; 381/340, international: H05K 005/00) Hughes, Charles Emory, II of Meridian, MS (assignee: Peavey Electronics Corporation of Meridian, MS) [Pt-Txt25KB] [DjVu*111KB]

U.S. Patent No. 6,064,745, 05/16/2000 (app. 06/04/1998, serial 089,938) COMPRESSION DRIVER PHASE PLUG (class: 381/343; 181/152; 181/159; 381/340, international: H04R 025/00) Avera, Donald Keith of Toomsuba, MS (assignee: Peavey Electronics Corporation of Meridian, MI) [Pt-Txt33KB] [DjVu*121KB]

U.S. Patent No. 6,101,261, 08/08/2000 (app. 06/17/1998, serial 098,438) VARIABLE TILT LOUD SPEAKER ENCLOSURE (class: 381/386; 181/199; 381/86; 381/387, international: H04R 025/00) Brown, James W., Sr. of Meridian, MS (assignee: Peavey Electronics Corporation of Meridian, MS) [Pt-Txt30KB] [DjVu*78KB]

U.S. Patent No. 6,108,427, 8/22/2000 (app: 6/4/1997, serial: 868,739) METHOD AND APPARATUS FOR ELIMINATING AUDIO FEEDBACK (class: 381/83; 381/77; 381/93, international: H04R 027/00) Norris, Elwood G. of Poway, CA and Bank, Jeevan of San Diego, CA (assignee: American Technology Corporation (DE))) [PtTxt33KB] [DjVu*78KB]

U.S. Patent No. 6,108,433, 8/22/2000 (app: 1/13/1998, serial: 6,689) METHOD AND APPARATUS FOR A MAGNETICALLY INDUCED SPEAKER DIAPHRAGM (class: 381/399; 367/140; 381/162; 381/360; 381/406; 381/408, international: H04R 025/00) Norris, Elwood G. of Poway, CA (assignee: American Technology Corporation of San Diego, CA) [PtTxt50KB] [DjVu*103KB]

U.S. Patent No. 6,239,655, 05/29/2001 (app. 08/02/1999, serial 365,019) MICROPHONE AMPLIFIER WITH DIGITAL GAIN CONTROL (class: 330/86; 330/282; 381/121, international: H03F 001/36; H03F 021/00) Orozov, Borislav Lubenov of Meridian, MS and Caldwell, Dennis Lloyd of Meridian, MS and Hand, Larry Eugene of Meridian, MS and Stuckman, Thomas Richard of Meridian, MS (assignee: Peavey Electronics Corporation of Meridian, MS) [Pt-Txt30KB] [DjVu*73KB]

U.S. Patent No 6,288,749, 09/11/2001 (app: 11/16/1996 - serial: 746,870) COMPUTER SYSTEM WITH REMOTE TELEVISION DISPLAY (class: 348/552; 725/74; 725/78; 725/148; 725/153 - international: H04N 007/10; H04N 007/00; H04N 011/00) Freadman, Tommyca of Goshen, NY (assignee: Altec Lansing Technologies, Inc. of Milford, PA) [PtTxt28KB] [DjVu*42KB]

U.S. Patent No. 6,390,231, 05/21/2002 (app. 05/08/2001, serial 850,974) LOUDSPEAKER WITH DIRECTED AIRFLOW COOLING (class: 181/148; 181/153; 181/199, international: H05K 005/00) Howze, Bruce of Broomall, PA (assignee: Community Professional Loudspeakers of Chester, PA) [Pt-Txt40KB] [DjVu*133KB]

U.S. Patent No. 6,466,832, 10/15/2002 (app: 08/24/1998 - serial: 138,606) HIGH QUALITY WIRELESS AUDIO SPEAKERS (class: 700/94 - international: G06F 017/00) Zuqert, Benjamin of Tel Aviv, Israel and Tirosh, Oren of Ra'anana, Israel and Sussman, Giora of Moshav Bnei Zion, Israel and Rephaeli, Dan of Kfar Saba, Israel (assignee: Altec Lansing R & D Center Israel of Kfar Saba, Israel) [PtTxt90KB] [DjVu*174KB]

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