| Patents for H04R 31 - Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor (5,050) |
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| 01/02/1990 | US4891843 Electret microphone |
| 12/05/1989 | CA1263738A1 Method of producing electroacoustic converters, preferably microphones and converters produced according to the method |
| 12/05/1989 | CA1263737A1 Ear microphone utilizing displacement type bone vibration and method of manufacture thereof |
| 11/15/1989 | EP0341589A2 Method of and apparatus for manufacturing a crystalline diamond film for use as an acoustic diaphragm |
| 11/14/1989 | US4880591 Method for manufacturing speaker vibration member |
| 10/11/1989 | EP0336448A2 Electroacoustic diaphragm and method for making same |
| 09/26/1989 | US4869765 Production process of bobbin for voice coil |
| 08/15/1989 | CA1258519A1 Moving-coil loudspeaker unit |
| 08/08/1989 | US4855093 Applying high shear to carbon, binder mixture; molding |
| 07/18/1989 | US4847981 Method for producing a diaphragm for acoustic appliances |
| 05/23/1989 | US4832150 Sound-permeable cover for a loudspeaker |
| 05/09/1989 | US4829582 Electrodynamic transducer |
| 05/09/1989 | US4828907 Diaphragm for producing sound |
| 03/28/1989 | US4817165 Acoustic speaker device with a diaphragm having a spider web type core |
| 03/08/1989 | EP0305540A1 Diaphragm unit of a condenser microphone, a method of fabricating the same, and a condenser microphone |
| 02/15/1989 | EP0303173A1 Sheet-form molded article composed of organic fiber and process for producing same |
| 02/07/1989 | US4803392 Strontium titanate or magnesium oxide substrate with lead titanate covering groove openings on substrate |
| 09/20/1988 | US4772513 Method for forming a hard carbon thin film on article and applications thereof |
| 09/13/1988 | US4770918 Diaphragm for producing sound |
| 09/07/1988 | WO1988006832A1 Diaphragm unit of a condenser microphone, a method of fabricating the same, and a condenser microphone |
| 08/18/1988 | DE3703840A1 Cone-diaphragm joint for loudspeaker |
| 08/03/1988 | CN87100424A Production method of holddown ring of loudspeakers |
| 07/19/1988 | US4758388 Method of manufacturing ceramic vibration plate for speaker |
| 06/23/1988 | EP0214958A4 Method and devices for making electro-acoustic transducer apparatus. |
| 06/15/1988 | CN87107923A Transducer mount |
| 06/14/1988 | US4750257 Method for making a magnet transducer assembly |
| 05/03/1988 | US4742164 Bacterial cellulose-containing molding material having high dynamic strength |
| 04/27/1988 | EP0264830A2 Diaphragm for producing sound |
| 04/26/1988 | CA1235790A1 Electret microphone |
| 04/20/1988 | EP0264131A2 Diaphragm for producing sound |
| 02/16/1988 | US4725345 Method for forming a hard carbon thin film on article and applications thereof |
| 02/03/1988 | EP0255509A2 Loudspeaker front and method of producing the same |
| 02/03/1988 | CN87207601U Sintered silicon cup and high pressure sensor thereof |
| 01/07/1988 | EP0251057A1 Loudspeaker |
| 12/23/1987 | DE3620889A1 Loudspeaker |
| 12/01/1987 | CA1229907A1 Electroacoustic transducer with a piezoelectric diaphragm |
| 10/06/1987 | US4697334 Method of producing electroacoustic converters, preferably microphones, and converters produced according to the method |
| 09/09/1987 | EP0235838A1 Electrodynamic transducer |
| 08/13/1987 | DE3546548A1 Membrane for sound converters (transducers) |
| 08/11/1987 | CA1225468A1 Method of fabricating composite electrical transducers |
| 07/14/1987 | US4680800 Moving-coil loudspeaker unit |
| 06/30/1987 | US4677336 Piezoelectric transducer and process for its production |
| 06/23/1987 | US4674161 Connection method for piezo-electric acoustic transducers in electro-acoustic capsules |
| 06/03/1987 | EP0224087A2 Method of making thin-walled ceramic articles, and a diaphragm for acoustic transducers produced thereby |
| 03/31/1987 | US4654546 Electromechanical film and procedure for manufacturing same |
| 03/25/1987 | EP0214958A1 Method and devices for making electro-acoustic transducer apparatus |
| 03/24/1987 | US4652702 Ear microphone utilizing vocal bone vibration and method of manufacture thereof |
| 02/03/1987 | US4640382 Acoustic frictional resistance construction and method of producing an acoustic frictional resistance using a laser |
| 01/17/1987 | CN85102335A Composite ultrasonic transducers and methods for making the same |
| 01/07/1987 | CN86100615A Loudspeaker and its mfg. process |
| 12/23/1986 | US4630358 Method of making an electrostatic transducer of the moving coil type |
| 12/09/1986 | US4628223 Composite ceramic/polymer piezoelectric material |
| 12/02/1986 | US4626729 Electroacoustic piezoelectric transducers |
| 11/05/1986 | EP0200409A2 Moulded material comprising bacteria-produced cellulose |
| 11/05/1986 | EP0199737A1 Methods and apparatus for tensioning sheet material |
| 10/21/1986 | CA1213031A1 Flat-diaphragm transducer and method of manufacturing such a transducer |
| 08/19/1986 | US4607145 Electroacoustic transducer with a piezoelectric diaphragm |
| 08/12/1986 | US4604792 Method for making electro-acoustic transducer apparatus |
| 07/22/1986 | US4601764 Method for producing anistropic configuration magnet |
| 07/16/1986 | EP0115485B1 Electroacoustic transducer |
| 07/03/1986 | WO1986003928A1 Method and devices for making electro-acoustic transducer apparatus |
| 07/02/1986 | EP0185833A1 Membrane in plastic materials for loudspeakers |
| 05/28/1986 | EP0182764A2 Electromechanical film and procedure for manufacturing same |
| 05/27/1986 | US4591672 Loud speaker assembly |
| 04/29/1986 | CA1203885A1 Loudspeaker construction and method of assembly |
| 04/01/1986 | US4580119 Iron, chromium, and cobalt alloy tube section and radial flange segment |
| 03/27/1986 | WO1986001968A1 Methods and apparatus for tensioning sheet material |
| 03/25/1986 | US4578808 Electro-acoustic transducers |
| 03/18/1986 | US4577069 Electroacoustical transducer |
| 02/25/1986 | US4572981 Transducer comprising composite electrical materials |
| 02/04/1986 | US4568414 Methods and apparatus for tensioning sheet material |
| 02/04/1986 | CA1200307A1 Electro-acoustic transducers |
| 01/28/1986 | US4567327 Flat-diaphragm transducer and method of manufacturing such a transducer |
| 01/28/1986 | US4566178 Process for assembling a cone speaker |
| 01/21/1986 | US4565905 Loudspeaker construction |
| 01/14/1986 | CA1199396A1 Electroacoustic transducer |
| 01/07/1986 | US4562899 Diaphragm of electroacoustic transducer and method of manufacturing the same |
| 11/06/1985 | EP0160478A2 Improved moving-coil loudspeaker unit |
| 10/16/1985 | EP0158230A1 Piezoelectric-acoustic transducer for electroacoustic units with constructional features for assembling |
| 07/03/1985 | EP0147373A1 Method of producing electroacoustic converters, preferably microphones, and converters produced according to the method |
| 05/28/1985 | US4520237 Electrodynamic speaker |
| 05/21/1985 | US4518443 Acoustic diaphragm |
| 04/30/1985 | US4514247 Laminated piezoelectric material and passive material |
| 04/17/1985 | EP0137624A2 Electroacoustic transducer |
| 04/17/1985 | EP0137529A2 Method for fabricating composite electrical transducers |
| 01/08/1985 | US4492825 Electroacoustic transducer |
| 11/27/1984 | US4484383 Method of manufacturing a speaker diaphragm |
| 10/17/1984 | EP0121555A1 Diaphragm stretching apparatus |
| 09/12/1984 | EP0118356A1 Electro-acoustic transducer with piezo-electric diaphragm |
| 09/11/1984 | US4470479 Method of making metal coated foil speaker diaphragm |
| 09/04/1984 | US4469978 Electrode arrangement for a folded polymer piezoelectric ultrasonic detector |
| 08/14/1984 | US4465905 Loudspeaker assembly |
| 04/26/1984 | WO1984001683A1 Diaphragm stretching apparatus |
| 02/16/1984 | WO1984000662A1 Electroacoustic transducer |
| 11/29/1983 | US4418247 Electrodynamic transducer |
| 08/30/1983 | US4401858 Method for controlling wrinkles in a vibratile diaphragm |
| 07/06/1983 | EP0083174A1 Electro-acoustic transducers |
| 06/22/1983 | EP0082086A1 Loudspeaker diaphragm and method for its manufacture |
| 06/21/1983 | US4389548 Acoustic transducer |
| 03/22/1983 | US4377617 Loudspeaker diaphragm and process for producing same |