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Class Information
Number: 367/170
Name: Communications, electrical: acoustic wave systems and devices > Signal transducers > Underwater type > Electret
Description: Subject matter wherein acoustic wave energy acts on or is caused by a dielectric body having separated, permanent electric poles of opposite polarity.

Patents under this class:

Patent Number Title Of Patent Date Issued
8256093 Method of manufacturing an acoustic mirror Sep. 4, 2012
7971337 Method for producing a microphone module for a hearing aid device Jul. 5, 2011
7926163 Method of producing an oscillator device Apr. 19, 2011
7925033 Electro-acoustic transducer Apr. 12, 2011
7905006 Method of manufacturing faceplate for in-the-ear hearing aid Mar. 15, 2011
7779696 Separate cMUTs for reception and transmission Aug. 24, 2010
7669310 Method of manufacturing an acoustic mirror Mar. 2, 2010
7498699 Electret and composite formed therewith Mar. 3, 2009
7436736 Hydrophone array module Oct. 14, 2008
7412763 Method of making an acoustic assembly for a transducer Aug. 19, 2008
7204009 Manufacturing method of acoustic sensor Apr. 17, 2007
7080442 Manufacturing method of acoustic sensor Jul. 25, 2006
6937735 Microphone for a listening device having a reduced humidity coefficient Aug. 30, 2005
6928720 Method of manufacturing a surface acoustic wave device Aug. 16, 2005
6870939 SMT-type structure of the silicon-based electret condenser microphone Mar. 22, 2005
6806593 Thin film electret microphone Oct. 19, 2004
6792123 Electroacoustic transducer Sep. 14, 2004
6694032 Electret condenser microphone Feb. 17, 2004
6678383 Capacitor microphone Jan. 13, 2004
6632178 Fabrication of capacitive micromachined ultrasonic transducers by micro-stereolithography Oct. 14, 2003
6243474 Thin film electret microphone Jun. 5, 2001
6201874 Electrostatic transducer with nonplanar configured diaphragm Mar. 13, 2001
6169810 Electroacoustic transducer Jan. 2, 2001
6111966 Capacitor microphone Aug. 29, 2000
5982709 Acoustic transducers and method of microfabrication Nov. 9, 1999
5757090 Folded dielectric film element and method for maufacturing the same May. 26, 1998
5548658 Acoustic Transducer Aug. 20, 1996
5255246 Electroacoustic transducer of the electret type Oct. 19, 1993
RE33718 Acoustic transducer with improved electrode spacing Oct. 15, 1991
5046057 Marine streamer cable Sep. 3, 1991
4910840 Electroacoustic transducer of the so-called "electret" type, and a method of making such a transducer Mar. 27, 1990
4908805 Electroacoustic transducer of the so-called "electret" type, and a method of making such a transducer Mar. 13, 1990
4730283 Acoustic transducer with improved electrode spacing Mar. 8, 1988
4653036 Transducer hydrophone with filled reservoir Mar. 24, 1987
4517665 Acoustically transparent hydrophone probe May. 14, 1985
4433400 Acoustically transparent hydrophone probe Feb. 21, 1984
4370182 Method of making tape transducer Jan. 25, 1983
4245329 Elongated seismic receiver of continuous structure Jan. 13, 1981
4034332 Ultrasonic transmitting and receiving devices using dielectric transducers Jul. 5, 1977
4011540 Combined electret hydrophone and transmission line Mar. 8, 1977
3978446 Electret cable hydrophone array Aug. 31, 1976

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