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Class Information
Number: 367/172
Name: Communications, electrical: acoustic wave systems and devices > Signal transducers > Underwater type > Transducer with pressure compensating means
Description: Subject matter wherein means is provided to counteract the effects on the transducer of the static pressure of the surrounding water.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8644115 Hydrophone and pressure balancing device for using for hydrophone Feb. 4, 2014
8570835 Marine vibratory sound source for beneath water seismic exploration Oct. 29, 2013
8488415 Submersible electro-dynamic acoustic projector Jul. 16, 2013
8130594 Mechanically filtered hydrophone Mar. 6, 2012
7570543 Normally closed pressure-sensitive hydrophone switch Aug. 4, 2009
7466631 Enhanced sensitivity pressure tolerant fiber optic hydrophone Dec. 16, 2008
7295493 Pressure tolerant fiber optic hydrophone Nov. 13, 2007
6754136 Hydrophone with automatic inhibition in case an adjustable immersion threshold is exceeded Jun. 22, 2004
6515940 Electrodynamic transducer for underwater acoustics Feb. 4, 2003
6483778 Systems and methods for passively compensating transducers Nov. 19, 2002
6275448 Pressure-compensated acceleration-insensitive hydrophone Aug. 14, 2001
6122225 Hydrophone with compensation for statical pressure and method for pressure wave measurement Sep. 19, 2000
6046962 Electrodynamic transducer for underwater acoustics Apr. 4, 2000
5828761 Sound amplification system having a submersible microphone Oct. 27, 1998
5784341 Underwater acoustic transmitter for large submersion Jul. 21, 1998
5768216 Flexitensional transducer having a strain compensator Jun. 16, 1998
5579287 Process and transducer for emitting wide band and low frequency acoustic waves in unlimited immersion depths Nov. 26, 1996
5555221 Device for picking up sound waves propagating in water Sep. 10, 1996
5450373 Apparatus for transmitting two frequency signals with an acoustic projector Sep. 12, 1995
5361240 Acoustic sensor Nov. 1, 1994
5349568 Leak locating microphone, method and system for locating fluid leaks in pipes Sep. 20, 1994
5301170 Ultrasonic sensor mounting device Apr. 5, 1994
5247490 Pressure-compensated optical acoustic sensor Sep. 21, 1993
5243566 Low noise transducer system Sep. 7, 1993
5222050 Water-resistant transducer housing with hydrophobic vent Jun. 22, 1993
5155709 Electro-acoustic transducers Oct. 13, 1992
5140560 Pressure compensated transducer system with constrained diaphragm Aug. 18, 1992
5132941 Method and apparatus for sensing sound waves in a fluid medium Jul. 21, 1992
5103432 Expendable sound source Apr. 7, 1992
5062089 Sonar projector with liquid mass loading for operation at lower frequency Oct. 29, 1991
5043953 Pressure compensation device for an immersed volume of gas, in particular for an underwater electroacoustic transducer Aug. 27, 1991
5007030 Transducer assembly for deep submergence Apr. 9, 1991
5003285 Transducer array Mar. 26, 1991
4996675 Signal sensor insensitive to static pressure variations Feb. 26, 1991
4991153 Vibration type transducer Feb. 5, 1991
4951698 Process and devices for maintaining the gas contained in a submerged enclosure in pressure equilibrium with the outside Aug. 28, 1990
4926398 Pressure compensated communication system May. 15, 1990
4918666 Tubular piezo-electric sensor with high sensitivity Apr. 17, 1990
4875199 Deep water transient sound generator Oct. 17, 1989
4872148 Ultrasonic transducer for use in a corrosive/abrasive environment Oct. 3, 1989
4868799 Means for equalizing the internal pressure in an underwater transducer employing a vibratile piston to permit operation of the transducer at water depths in excess of a few hundred feet Sep. 19, 1989
4862430 Wide pass band elastic wave omnidirectional transducer Aug. 29, 1989
4853905 Seal for marine seismic source Aug. 1, 1989
4839871 Underwater communication device Jun. 13, 1989
4821244 Tubular acoustic projector Apr. 11, 1989
4815557 Down hole seismographic source Mar. 28, 1989
4782471 Omnidirectional transducer of elastic waves with a wide pass band and production process Nov. 1, 1988
4763307 Wide-range audio frequency underwater transducer Aug. 9, 1988
H391 Piezoelectric polymer hydrophone Dec. 1, 1987
4704709 Transducer assembly with explosive shock protection Nov. 3, 1987

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