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Class Information
Number: 367/158
Name: Communications, electrical: acoustic wave systems and devices > Signal transducers > Underwater type > Piezoelectric > Head and tail mass
Description: Subject matter wherein the piezoelectric element has a mass acting as a driving or driven piston at one end of its axis and a relatively stationary inertial mass at the other end.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8072843 Stepped multiply resonant wideband transducer apparatus Dec. 6, 2011
8063539 Electrostrictive drive Nov. 22, 2011
7535801 Multiple frequency sonar transducer May. 19, 2009
7126878 Push-pull tonpilz transducer Oct. 24, 2006
7104357 Device for generating focused elastic waves in a material medium such as underground, and method using same Sep. 12, 2006
6950373 Multiply resonant wideband transducer apparatus Sep. 27, 2005
6690621 Active housing broadband tonpilz transducer Feb. 10, 2004
6654316 Single-sided electro-mechanical transduction apparatus Nov. 25, 2003
6418960 Ultrasonic enhancement for solvent purge of a liquid delivery system Jul. 16, 2002
6275448 Pressure-compensated acceleration-insensitive hydrophone Aug. 14, 2001
RE36828 Electroacoustic transducer Aug. 22, 2000
6076629 Low frequency flextensional acoustic source for underwater use Jun. 20, 2000
6041888 Low frequency flextensional acoustic source for underwater use Mar. 28, 2000
5898642 Sonar antenna Apr. 27, 1999
5867450 State switched acoustic transducer Feb. 2, 1999
5808970 Multi-layer acoustically transparent sonar array Sep. 15, 1998
5761156 Piezoelectric ultrasonic transducer Jun. 2, 1998
5751659 Ceramic mass loaded longitudinal vibrator May. 12, 1998
5748566 Ultrasonic transducer May. 5, 1998
5747906 Electroacoustic transducer May. 5, 1998
5726952 Sound or ultrasound sensor Mar. 10, 1998
5694374 Process and device to reduce the resonant frequency of the cavities of the submersible transducers Dec. 2, 1997
5546361 Directional electro-acoustic transducers comprising a sealed sell consisting of two portions Aug. 13, 1996
5515342 Dual frequency sonar transducer assembly May. 7, 1996
5515343 Electro acoustic transducers comprising a flexible and sealed transmitting shell May. 7, 1996
5497357 Shock-resistant flextensional transducer Mar. 5, 1996
5491671 Sonar transducer with unitary isolator Feb. 13, 1996
5483502 Method and apparatus for emitting high power acoustic waves using transducers Jan. 9, 1996
5389848 Hybrid ultrasonic transducer Feb. 14, 1995
5367501 Dual-frequency sonar system Nov. 22, 1994
5363345 Process and electro-acoustic transducers for transmitting low-frequency acoustic waves in a liquid Nov. 8, 1994
5321333 Torsional shear wave transducer Jun. 14, 1994
H1308 Narrow band acoustic source May. 3, 1994
5299175 Electroacoustic unit for generating high sonic and ultra-sonic intensities in gases and interphases Mar. 29, 1994
5274608 Sonar transducer Dec. 28, 1993
5166907 Frequency agile sonic transducer Nov. 24, 1992
5155709 Electro-acoustic transducers Oct. 13, 1992
5136556 Wide bandwidth barrel stave projector Aug. 4, 1992
5130953 Submersible electro-acoustic transducer Jul. 14, 1992
5105390 Acoustic measuring device Apr. 14, 1992
4996674 Double piston acoustic transducer with selectable directivity Feb. 26, 1991
4991152 Electroacoustic transducer, usable in particular as a source of acoustic waves for submarine applications Feb. 5, 1991
4972390 Stack driven flexural disc transducer Nov. 20, 1990
4970706 Flextensor transducer Nov. 13, 1990
4964106 Flextensional sonar transducer assembly Oct. 16, 1990
4949316 Acoustic logging tool transducers Aug. 14, 1990
4941202 Multiple segment flextensional transducer shell Jul. 10, 1990
4932008 Hinge-modified flextensional transducer Jun. 5, 1990
4916675 Broadband omnidirectional electroacoustic transducer Apr. 10, 1990
4878207 Composite sonar transducer for operation as a low frequency underwater acoustic source Oct. 31, 1989

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