| Patents for H04R 19 - Electrostatic transducers (5,387) |
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| 08/16/1988 | US4764690 Electret transducing |
| 08/02/1988 | CA1240032A1 Electret microphone |
| 07/12/1988 | US4757545 Amplifier circuit for a condenser microphone system |
| 06/16/1988 | DE3740918A1 Electroacoustic or electromechanical transducer in accordance with the electrostatic conversion principle |
| 04/26/1988 | CA1235790A1 Electret microphone |
| 04/06/1988 | CN87206480U Multipurpose stereo electret condenser microphone |
| 03/24/1988 | WO1988002208A1 Acoustic transducer with improved electrode spacing |
| 03/09/1988 | EP0258912A1 Device for converting an electrical signal into an acoustic signal comprising an electrostatic transducer unit |
| 03/08/1988 | US4730283 Acoustic transducer with improved electrode spacing |
| 02/11/1988 | DE3724262A1 Circuit arrangement for capacitive voltage sources having a high output impedance, especially for capacitor microphones |
| 01/28/1988 | WO1988000787A1 Pressure gradient microphone |
| 12/15/1987 | CA1230410A1 Condenser microphone having resistance against high temperature and radioactive rays |
| 12/03/1987 | DE3618241A1 Electrostatic transducer |
| 10/27/1987 | US4703509 Electrostatic acoustic converter with stationary electrode having a progressively increasing surface resistance |
| 10/21/1987 | EP0148893B1 Integrated electroacoustic transducer |
| 10/20/1987 | US4701640 Electret transducer and method of fabrication |
| 10/06/1987 | US4697334 Method of producing electroacoustic converters, preferably microphones, and converters produced according to the method |
| 09/01/1987 | US4691363 Transducer device |
| 08/12/1987 | EP0231596A2 Electrostatic type atmospheric ultrasonic transducer |
| 06/16/1987 | US4672849 Semiconductor vibration detecting structure |
| 05/26/1987 | US4668865 Scanning tunneling microscope |
| 03/31/1987 | US4654546 Electromechanical film and procedure for manufacturing same |
| 03/18/1987 | CN85100574A Method for manufacturing transducer electret back pole |
| 03/10/1987 | US4648480 Condenser microphone having resistance against high-temperature and radioactive rays |
| 03/10/1987 | CA1219056A1 Integrated electroacoustic transducer |
| 02/04/1987 | CN85101800A Transmitter assembly for a telephone handset |
| 01/20/1987 | US4637489 Electroacoustic transducer |
| 12/09/1986 | CA1215164A1 High energy ultrasonic transducer |
| 12/02/1986 | US4626729 Electroacoustic piezoelectric transducers |
| 11/05/1986 | EP0199737A1 Methods and apparatus for tensioning sheet material |
| 11/04/1986 | US4621171 Electroacoustic transducer and a method for manufacturing thereof |
| 10/07/1986 | US4615105 Electroacoustic transducer and a method for manufacturing thereof |
| 09/17/1986 | EP0194958A2 Electret transducer and method of fabrication |
| 09/17/1986 | EP0194323A1 Scanning tunneling microscope |
| 09/09/1986 | US4610062 Method of making an acoustic microphone |
| 08/26/1986 | CA1210495A1 Lead-frame for an electret microphone |
| 08/19/1986 | US4607383 Throat microphone |
| 08/19/1986 | CA1210131A1 Integrated capacitive transducer |
| 07/16/1986 | EP0115485B1 Electroacoustic transducer |
| 06/05/1986 | EP0147432A4 Electrode for electrostatic transducer and methods of manufacture. |
| 06/05/1986 | EP0137826A4 Integrated capacitive transducer. |
| 05/28/1986 | EP0182764A2 Electromechanical film and procedure for manufacturing same |
| 05/13/1986 | US4588867 Ear microphone |
| 04/29/1986 | US4586192 Soundstage boundary expansion system |
| 04/15/1986 | US4582961 Capacitive transducer |
| 03/27/1986 | WO1986001968A1 Methods and apparatus for tensioning sheet material |
| 03/18/1986 | CA1202113A1 Electrostatic transducer having a fixed electrode provided with depressions and through openings |
| 02/18/1986 | US4571661 Semiconductor vibration detection device with lever structure |
| 02/18/1986 | US4571464 Electret microphone |
| 02/18/1986 | CA1200888A1 Electrostatical sound transducer |
| 02/04/1986 | US4568414 Methods and apparatus for tensioning sheet material |
| 01/28/1986 | US4567445 High input impedance low output impedance amplifier |
| 01/28/1986 | US4567382 Electret transducer and a method for manufacturing an assembly of backplate, electret foil and diaphragm plate |
| 01/14/1986 | CA1199396A1 Electroacoustic transducer |
| 12/18/1985 | EP0164342A1 High energy ultrasonic transducer |
| 12/10/1985 | US4558184 Integrated capacitive transducer |
| 12/03/1985 | CA1197605A1 Method for manufacturing electret device |
| 10/29/1985 | CA1196083A1 Anti-side tone transmitter |
| 10/15/1985 | CA1195420A1 Ultrasonic transducer for use in a vibratory environment |
| 09/17/1985 | US4542264 Lead-frame for an electric microphone |
| 09/11/1985 | EP0154256A2 Ultrasonic transducer for use in a corrosive/abrasive environment |
| 09/10/1985 | US4541112 Electroacoustic transducer system |
| 09/10/1985 | CA1193356A1 Condenser microphone |
| 09/03/1985 | US4539441 Hearing-aid with integrated circuit electronics |
| 08/07/1985 | EP0150976A2 Soundstage boundary expansion system |
| 08/06/1985 | US4533795 Integrated electroacoustic transducer |
| 08/06/1985 | US4533794 Electrode for electrostatic transducer |
| 07/24/1985 | EP0148893A1 Integrated electroacoustic transducer. |
| 07/16/1985 | CA1190481A1 Electrostatic loudspeaker |
| 07/10/1985 | EP0147432A1 Electrode for electrostatic transducer and methods of manufacture |
| 07/03/1985 | EP0147373A1 Method of producing electroacoustic converters, preferably microphones, and converters produced according to the method |
| 06/20/1985 | WO1985002748A1 High energy ultrasonic transducer |
| 06/18/1985 | US4524247 Integrated electroacoustic transducer with built-in bias |
| 05/14/1985 | US4516428 Acceleration vibration detector |
| 05/08/1985 | EP0140143A2 Electrostatic sound transducer |
| 05/07/1985 | US4515997 Direct digital loudspeaker |
| 04/24/1985 | EP0138023A2 Semiconductor vibration detection device with lever structure |
| 04/24/1985 | EP0137826A1 Integrated capacitive transducer |
| 04/23/1985 | CA1186047A1 Electret transducer with variable electret foil thickness |
| 04/23/1985 | CA1186046A1 Electret transducer with variable effective air gap |
| 04/23/1985 | CA1186045A1 Electret transducer with variable actual air gap |
| 04/23/1985 | CA1186044A1 Electret transducer with a selectively metalized backplate |
| 04/16/1985 | CA1185694A1 Electret transducer with variably charged electret foil |
| 04/16/1985 | CA1185453A1 Electrostatic bonded, silicon capacitive pressure transducer |
| 04/03/1985 | EP0136270A1 Electret microphone |
| 04/03/1985 | EP0136249A2 Three plate, silicon-glass-silicon capacitive pressure transducer |
| 04/02/1985 | US4508192 Microphone diaphragm |
| 03/26/1985 | US4507705 Vibration analyzing device |
| 02/26/1985 | US4501462 Coupling member for a capacitive microphone |
| 02/12/1985 | CA1182551A1 Continuous strip electret transducer array |
| 01/31/1985 | WO1985000495A1 Integrated electroacoustic transducer |
| 01/22/1985 | US4495541 Apparatus for and method of making an electret tape |
| 01/22/1985 | US4495385 Acoustic microphone |
| 01/15/1985 | CA1181162A1 Conference microphone unit |
| 01/08/1985 | US4492825 Electroacoustic transducer |
| 01/01/1985 | US4491697 Condenser microphone |
| 12/18/1984 | US4489278 Electrostatic voltage detecting device |
| 12/06/1984 | WO1984004865A1 Electrode for electrostatic transducer and methods of manufacture |
| 10/17/1984 | EP0121555A1 Diaphragm stretching apparatus |
| 10/02/1984 | CA1175549A1 Sonic transducer having diaphragm tensioning spring directly attached to diaphragm |