| Patents for H04R 19 - Electrostatic transducers (5,387) |
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| 04/12/1994 | US5303210 Integrated resonant cavity acoustic transducer |
| 04/06/1994 | EP0589974A1 A method and a system for testing capacitive acoustic transducers |
| 03/16/1994 | EP0587032A1 Integrated capacitive transducer |
| 03/01/1994 | US5290400 Fabrication method for microelectromechanical transducer |
| 12/21/1993 | US5272758 Electret condenser microphone unit |
| 11/24/1993 | CN1022882C Capacitor microphone cartridge |
| 11/18/1993 | DE4215983A1 Electret structure used in telephone receivers - comprising charge-storing dielectric layer having two different regions arranged on substrate |
| 11/03/1993 | EP0567535A1 Improved hearing apparatus |
| 10/19/1993 | US5255246 Electroacoustic transducer of the electret type |
| 09/22/1993 | EP0561566A2 Solid state condenser and microphone |
| 09/21/1993 | CA2017185C Method of making a variable capacitor microphone |
| 09/19/1993 | CA2092627A1 Solid state condenser and microphone devices |
| 09/16/1993 | WO1993018627A1 Electret microphone assembly, and method of manufacture |
| 08/25/1993 | EP0556792A1 Electret assembly |
| 08/03/1993 | US5233667 Camcorder with a microphone |
| 06/30/1993 | EP0549200A1 Electret transducer array |
| 06/02/1993 | CN2135221Y Noise-proof sound-gathering microphone |
| 05/25/1993 | US5214709 Hearing aid for persons with an impaired hearing faculty |
| 05/04/1993 | US5208789 Tantalum pentoxide layer |
| 04/27/1993 | US5206914 Electrostatic acoustic transducer having extremely thin diaphragm substrate |
| 04/27/1993 | US5206557 Microelectromechanical transducer and fabrication method |
| 03/31/1993 | CN1070532A Electret capacitive microphone |
| 03/24/1993 | EP0533284A1 Electroacoustic transducer of the electret type |
| 03/17/1993 | EP0531613A2 Electret condenser microphone unit |
| 03/04/1993 | WO1993004495A1 Electret feature, method of producing it, and its use in an electro-acoustic transducer |
| 03/02/1993 | US5189777 Method of producing micromachined differential pressure transducers |
| 01/21/1993 | WO1993001691A1 Electrolytic loudspeaker assembly |
| 12/17/1992 | DE4115221A1 Electrostatic, electro-acoustic transducer - has stationary counter electrodes which has conductive film on side away from diaphragm |
| 12/10/1992 | WO1992021982A1 A method and a system for testing capacitive acoustic transducers |
| 11/03/1992 | US5161128 Capacitive transducer system and method |
| 10/27/1992 | CA1309489C Microphone with frequency pre-emphasis channel plate |
| 09/29/1992 | US5151763 Acceleration and vibration sensor and method of making the same |
| 09/08/1992 | US5146435 Acoustic transducer |
| 08/19/1992 | EP0499237A2 Electret capacitor microphone and method for the assembly |
| 08/06/1992 | WO1992013430A1 Improved hearing apparatus |
| 08/04/1992 | US5136656 Probe microphone |
| 07/18/1992 | CA2100773A1 Hearing apparatus |
| 07/08/1992 | CN1062632A Capacitor microphone cartridge |
| 06/25/1992 | DE4041544A1 Electrostatic loudspeaker with stationary electrodes - has membrane threaded in zigzag path between parallel electrodes of alternating polarity |
| 06/17/1992 | EP0490486A2 Micromachined differential pressure transducers and method of producing the same |
| 06/11/1992 | WO1992010070A1 Microelectromechanical transducer and fabrication method |
| 04/07/1992 | US5101543 Method of making a variable capacitor microphone |
| 03/31/1992 | CA1298396C Capacitive sound transducer |
| 03/17/1992 | US5097515 Electret condenser microphone |
| 03/03/1992 | CA1296652C Method and apparatus for transforming a monaural signal into stereophonic signals |
| 01/23/1992 | DE4022933A1 Electrostatic loudspeaker - contg. thin electrode rods of rounded cross-sectional shape giving high-fidelity sound reproduction |
| 01/15/1992 | EP0466676A2 Hearing aid with a directive microphone having variable directivity |
| 01/07/1992 | CA1294032C Acoustic transducer with improved electrode spacing |
| 11/19/1991 | CA1292308C Transducer device |
| 10/15/1991 | USRE33718 Acoustic transducer with improved electrode spacing |
| 10/01/1991 | US5054081 Electrostatic transducer with improved bass response utilizing disturbed bass resonance energy |
| 08/14/1991 | DE4103784A1 Electrostatic transformer for microphone - has greater heat capacity and conductivity and reduces noise and recovery time |
| 08/13/1991 | US5038459 Method of fabricating the diaphragm unit of a condenser microphone by electron beam welding |
| 05/07/1991 | US5014322 Diaphragm unit of a condenser microphone, a method of fabricating the same, and a condenser microphone |
| 02/27/1991 | CN2072302U Suction cup type telephone recording wireless microphone |
| 02/27/1991 | CN2072301U 电子送话器 Electronic transmitter |
| 02/12/1991 | US4993072 Shielded electret transducer and method of making the same |
| 02/07/1991 | DE4021661A1 Counter electrode support for capacitive microphone |
| 01/29/1991 | US4989187 Acoustic apparatus |
| 01/22/1991 | US4987564 Acoustic apparatus |
| 12/11/1990 | US4977590 Signal level expansion apparatus as for a telecommunications system |
| 12/04/1990 | CA1277415C Elastomer membrane enhanced electrostatic transducer |
| 11/22/1990 | EP0397975A2 Method of making a variable capacitor microphone |
| 09/25/1990 | CA1274619A1 Ultrasonic transducer for use in a corrosive/abrasive environment |
| 09/19/1990 | EP0387299A1 Ic processed piezoelectric microphone |
| 06/06/1990 | EP0371620A2 Electret condenser microphone |
| 05/01/1990 | US4922471 Capacitive sound transducer |
| 03/27/1990 | US4910840 Electroacoustic transducer of the so-called "electret" type, and a method of making such a transducer |
| 03/13/1990 | US4908805 Electroacoustic transducer of the so-called "electret" type, and a method of making such a transducer |
| 01/02/1990 | US4891843 Electret microphone |
| 12/27/1989 | CA1264082A1 Electrostatic discharge protector for an electret microphone |
| 12/12/1989 | US4887300 Pressure gradient microphone |
| 12/05/1989 | US4885783 Elastomer membrane enhanced electrostatic transducer |
| 12/05/1989 | CA1263738A1 Method of producing electroacoustic converters, preferably microphones and converters produced according to the method |
| 10/03/1989 | US4872148 Ultrasonic transducer for use in a corrosive/abrasive environment |
| 09/27/1989 | CN2045169U Microsize electret microphone |
| 09/13/1989 | EP0331992A2 Capacitive sound transducer |
| 08/02/1989 | EP0326040A2 Microphone with acoustic frequency pre-emphasis |
| 07/18/1989 | US4849071 Method of forming a sealed diaphragm on a substrate |
| 07/18/1989 | US4849050 Method of producing a diaphragm on a substrate |
| 07/05/1989 | EP0322686A2 Acoustic apparatus |
| 07/05/1989 | EP0322679A2 Acoustic apparatus |
| 06/15/1989 | DE3740653A1 Wide-band sound transducer system |
| 06/07/1989 | CN1004464B Transmitter assembly for a telephone handset |
| 06/06/1989 | US4837833 Microphone with frequency pre-emphasis channel plate |
| 06/01/1989 | WO1989004881A1 Ic processed piezoelectric microphone |
| 05/10/1989 | CN2037516U Electret microphone of magneto-telephone set |
| 04/18/1989 | CA1252918A1 Scanning tunneling microscope |
| 03/28/1989 | US4817164 Electrostatic discharge protector for an electret microphone |
| 03/28/1989 | US4816125 Transducers, integrated circuits, zinc oxide films |
| 03/28/1989 | CA1251740A1 Soundstage boundary expansion system |
| 03/08/1989 | EP0305540A1 Diaphragm unit of a condenser microphone, a method of fabricating the same, and a condenser microphone |
| 02/15/1989 | CN2032448U Medical sensor for cardiac sounds |
| 01/17/1989 | US4799265 Electrostatic transducer unit |
| 01/12/1989 | WO1989000295A1 Systems and methods for sensing position and movement |
| 01/10/1989 | US4796725 Electrostatic transducer |
| 12/06/1988 | US4790021 Electrostatic transducer |
| 11/08/1988 | US4783821 Transducer of silicon nitride covered by zinc oxide film encapsulated in silicon oxide |
| 09/07/1988 | WO1988006832A1 Diaphragm unit of a condenser microphone, a method of fabricating the same, and a condenser microphone |
| 08/30/1988 | US4767973 Systems and methods for sensing position and movement |