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Class Information
Number: 367/168
Name: Communications, electrical: acoustic wave systems and devices > Signal transducers > Underwater type > Magnetostrictive
Description: Subject matter wherein the acoustic wave energy causes or is caused by changes in the dimensions or internal stresses of a ferromagnetic material.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8681586 Free charge carrier diffusion response transducer for sensing gradients Mar. 25, 2014
8471432 Magnetostrictive actuator Jun. 25, 2013
8134432 Magnetically biased magnetopropant and pump Mar. 13, 2012
8093869 Apparatus for generating electricity utilizing nondestructive interference of energy Jan. 10, 2012
7893801 Magnetically biased magnetopropant and pump Feb. 22, 2011
7881158 Seismic vibrator having multiple resonant frequencies in the seismic frequency band using multiple spring and mass arrangements to reduce required reactive mass Feb. 1, 2011
7726193 Electromagnetic acoustic transducer with cross-talk elimination Jun. 1, 2010
7697375 Combined electro-magnetic acoustic transducer Apr. 13, 2010
7551518 Driving means for acoustic marine vibrator Jun. 23, 2009
7165453 Flexible electromagnetic acoustic transducer sensor Jan. 23, 2007
6600962 Sensor controller Jul. 29, 2003
6272916 Acoustic wave transmission system and method for transmitting an acoustic wave to a drilling metal tubular member Aug. 14, 2001
6188313 Device for generating sound Feb. 13, 2001
6076629 Low frequency flextensional acoustic source for underwater use Jun. 20, 2000
5812496 Water resistant microphone Sep. 22, 1998
5615172 Autonomous data transmission apparatus Mar. 25, 1997
5568448 System for transmitting a signal Oct. 22, 1996
5550792 Sliced phased array doppler sonar system Aug. 27, 1996
5414397 Clamping device for magnetostrictive bodies May. 9, 1995
5357232 Magnetostrictive element Oct. 18, 1994
5355351 Underwater low-frequency sound producer using a rare earth alloy Oct. 11, 1994
5329499 Acoustic transmitter Jul. 12, 1994
5132942 Low frequency electroacoustic transducer Jul. 21, 1992
5103483 Spherical membrane omnidirectional loudspeaker using a magnetostrictive bimetallic strip Apr. 7, 1992
5101384 Acoustic devices Mar. 31, 1992
5070486 Process to increase the power of the low frequency electro acoustic transducers and corresponding transducers Dec. 3, 1991
5020036 Magnetostrictive transducer for logging tool May. 28, 1991
4965778 Helical magnetostrictive core line hydrophone Oct. 23, 1990
4907209 Low frequency sound transducer Mar. 6, 1990
4901293 Rare earth flextensional transducer Feb. 13, 1990
4866682 Transducer device Sep. 12, 1989
4864548 Flextensional transducer Sep. 5, 1989
4862430 Wide pass band elastic wave omnidirectional transducer Aug. 29, 1989
4845688 Electro-mechanical transduction apparatus Jul. 4, 1989
4782471 Omnidirectional transducer of elastic waves with a wide pass band and production process Nov. 1, 1988
4754441 Directional flextensional transducer Jun. 28, 1988
4742499 Flextensional transducer May. 3, 1988
4716556 Magnetostrictive acoustic transducer Dec. 29, 1987
4706230 Underwater low-frequency ultrasonic wave transmitter Nov. 10, 1987
4700803 Transducer forming compression and shear waves for use in acoustic well logging Oct. 20, 1987
4642802 Elimination of magnetic biasing using magnetostrictive materials of opposite strain Feb. 10, 1987
4641291 Phased array Doppler sonar transducer Feb. 3, 1987
4636999 Magnetostrictive pulse generator Jan. 13, 1987
4604612 Ice detector Aug. 5, 1986
4541081 Electroacoustic transducer Sep. 10, 1985
4443731 Hybrid piezoelectric and magnetostrictive acoustic wave transducer Apr. 17, 1984
4438509 Transducer with tensioned-wire precompression Mar. 20, 1984
4384351 Flextensional transducer May. 17, 1983
4361879 Ferrofluid transducer Nov. 30, 1982
4308603 Ferrofluid transducer Dec. 29, 1981

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