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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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The U.S. Patent No. x,xxx,xxx link opens the patent document (in a new browser window) from the USPTO site. Patents issued before 1976 (* before the link ) are displayed on the USPTO site as TIFF images, only, and require the installation of a free Tiff Viewer plug-in.

Inventors and Assignees’ links open any biographical information we have in the current browser window.

The [abstract] link opens the Abstract Listing in the current browser window. As of June 27, 2002 abstracts will not be published for newly processed patent listings. AudioAnnals is in the process of converting the site to generate pages, dynamically, from a database. Creating the abstract listings would be unnecessary work. Please view the DjVu documents in the mean time.

The [Pt-TxtxxxKB] links are being added to patents issued after 1975. They link to local copies of the USPTO full text HTML files and contain no drawings or mathematical expressions. Where available, they should be opened in lieu of the second instance of the [DjVuxxxKB] link for simultaneous viewing of the patent’s text and drawings.

The [DjVuXXXKB] link opens a DjVu rendering of the Patent Office’s bitmapped TIFF image in a new browser window. In order to view the DjVu files you will need to install the free DjVu Reader plug-in. These files also contain rough OCR rendering of the patent’s text that may be copied and pasted into your research document.

*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: Internatio