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Class Information
Number: 367/180
Name: Communications, electrical: acoustic wave systems and devices > Signal transducers > Receivers > Piezoelectric
Description: Subject matter wherein acoustic wave energy is converted into electrical energy by a material which exhibits an electrostatic polarization when subjected to mechanical stress.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8647328 Reflected acoustic wave modulation Feb. 11, 2014
8611190 Bio-acoustic wave energy transducer Dec. 17, 2013
8333703 Ultrasonic diagnostic apparatus Dec. 18, 2012
8277441 Piezoelectric transducer Oct. 2, 2012
8248889 Ultrasound diagnostic apparatus Aug. 21, 2012
8203912 CMUTs with a high-k dielectric Jun. 19, 2012
8194504 Hydrophone unit Jun. 5, 2012
8121317 Piezoelectric microphone Feb. 21, 2012
8014231 Digital capacitive membrane transducer Sep. 6, 2011
7923970 Charge controlling circuit Apr. 12, 2011
7698793 Electret condenser microphone and method of producing the same Apr. 20, 2010
7549964 Multiple frequency doppler ultrasound probe Jun. 23, 2009
7469461 Method for making a diaphragm unit of a condenser microphone Dec. 30, 2008
7343661 Method for making condenser microphones Mar. 18, 2008
6947568 Condenser microphone Sep. 20, 2005
6937735 Microphone for a listening device having a reduced humidity coefficient Aug. 30, 2005
6798717 High density pixel array Sep. 28, 2004
6759769 Electromechanic film and acoustic element Jul. 6, 2004
6708387 Method for manufacturing condenser microphones Mar. 23, 2004
6483225 Ultrasound transducer and method of manufacture thereof Nov. 19, 2002
6423245 Piezoelectric ceramic composition for surface acoustic wave device and surface acoustic wave device Jul. 23, 2002
6307375 Seismic activity predictor in proximity with the earth including a dielectric for receiving precursor seismic electromagnetic waveforms Oct. 23, 2001
6212132 Three-dimensional radar apparatus and method for displaying three-dimensional radar image Apr. 3, 2001
6100697 Seismic activity predictor in proximity with the earth including a dielectric for receiving precursor seismic electromagnetic waveforms Aug. 8, 2000
5748567 Acceleration sensor May. 5, 1998
5742166 Seismic activity predictor including a dielectric for receiving precursor seismic electromagnetic waveforms Apr. 21, 1998
5681986 Acoustic sensing Oct. 28, 1997
5473942 Acoustic location fixing insect detector Dec. 12, 1995
5384753 Self-orienting seismic detector Jan. 24, 1995
H1356 Bomb sensor system Sep. 6, 1994
5307325 Accelerometer sensor noise reduction method and means Apr. 26, 1994
5293353 Method for manufacturing an acoustic sensor, and acoustic sensor obtained thereby, having a substantially non-detachable protective layer Mar. 8, 1994
5268878 Accelerometer sensor noise reduction method and means Dec. 7, 1993
5230921 Flexible piezo-electric membrane Jul. 27, 1993
5128905 Acoustic field transducers Jul. 7, 1992
5126980 Self-orienting vertically sensitive accelerometer Jun. 30, 1992
4937555 Piezoelectric apparatus and process for detection of insect infestation in an agricultural commodity Jun. 26, 1990
4928263 Hydrophones and similar devices May. 22, 1990
4899845 Echographic technique-based method and apparatus to detect structure and anomalies of the subsoil and/or sea bottom and the like Feb. 13, 1990
4884250 Accelerometer for blast monitoring Nov. 28, 1989
4864179 Two-dimensional piezoelectric transducer assembly Sep. 5, 1989
4849947 Acoustic ground vibration detector Jul. 18, 1989
4839872 Geophone with a sensitive element made of piezoelectric polymer Jun. 13, 1989
4810913 Increased sensitivity piezoelectric hydrophones Mar. 7, 1989
4755975 Piezoelectric transducer for transmitting or receiving ultrasonic waves Jul. 5, 1988
4705981 Ultrasonic transducer Nov. 10, 1987
4606014 Acoustic dipole shear wave logging device Aug. 12, 1986
4580252 Wide band acoustic receiver transducer Apr. 1, 1986
4556814 Piezoelectric ultrasonic transducer with porous plastic housing Dec. 3, 1985
4516228 Acoustic well logging device for detecting compressional and shear waves May. 7, 1985

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