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Class Information
Number: 367/162
Name: Communications, electrical: acoustic wave systems and devices > Signal transducers > Underwater type > Piezoelectric > With resonant or damping structure
Description: Subject matter wherein the piezoelectric element is combined with structure whose natural frequency of vibration is disclosed as being either the same as the operating frequency of the element or such as to absorb or attenuate undesired wave energy emanating from or applied to the piezoelectric element.

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8570837 Multilayer backing absorber for ultrasonic transducer Oct. 29, 2013
8406084 Transducer device having coupled resonant elements Mar. 26, 2013
8125852 Methods and systems for seismic signal detection Feb. 28, 2012
8072843 Stepped multiply resonant wideband transducer apparatus Dec. 6, 2011
8009518 Ultrasonic sensor with piezoelectric elements and vibration isolator Aug. 30, 2011
7889601 Lightweight acoustic array Feb. 15, 2011
7719926 Slotted cylinder acoustic transducer May. 18, 2010
7650963 Acoustic isolator for well logging system Jan. 26, 2010
7529154 Hybrid thin film heterostructure modular vibration control apparatus and methods for fabrication thereof May. 5, 2009
7216737 Acoustic isolator between downhole transmitters and receivers May. 15, 2007
7196971 Method and apparatus for damping an ultrasonic transducer suitable for time of flight ranging and level measurement systems Mar. 27, 2007
7180225 Piezoelectric vibrator Feb. 20, 2007
7104357 Device for generating focused elastic waves in a material medium such as underground, and method using same Sep. 12, 2006
7046583 High-power transmission acoustic antenna May. 16, 2006
7032707 Acoustic isolator downhole applications Apr. 25, 2006
7028806 Acoustic isolator for downhole applications Apr. 18, 2006
7026943 Acoustic wave ice and water detector Apr. 11, 2006
7019439 High power ultrasonic transducer with broadband frequency characteristics at all overtones and harmonics Mar. 28, 2006
6987445 Water resistant audible signal Jan. 17, 2006
6950373 Multiply resonant wideband transducer apparatus Sep. 27, 2005
6862254 Microfabricated ultrasonic transducer with suppressed substrate modes Mar. 1, 2005
6849053 Shock wave source with a wave damping coil carrier Feb. 1, 2005
6837859 Shock wave source with a coil carrier having a non-circular contour Jan. 4, 2005
6784600 Ultrasonic membrane transducer for an ultrasonic diagnostic probe Aug. 31, 2004
6768702 Baffled ring directional transducers and arrays Jul. 27, 2004
6751162 Seismic sensor Jun. 15, 2004
6714484 Microfabricated acoustic transducer with suppressed substrate modes Mar. 30, 2004
6711096 Shaped piezoelectric composite array Mar. 23, 2004
6643221 Structures and methods for damping tool waves particularly for acoustic logging tools Nov. 4, 2003
6567343 Flextensional resonant pipe projector May. 20, 2003
6567342 Flared wave-guide projector May. 20, 2003
6545949 Axial drive resonant pipe projector (ADRPP) Apr. 8, 2003
6514618 Multilayer backing material for 2-D ultrasonic imaging arrays Feb. 4, 2003
6504795 Arrangement of micromechanical ultrasound transducers Jan. 7, 2003
6418960 Ultrasonic enhancement for solvent purge of a liquid delivery system Jul. 16, 2002
6400649 Self biased transducer assembly and high voltage drive circuit Jun. 4, 2002
RE37204 Transducer assembly Jun. 5, 2001
6166998 Moulded transducer Dec. 26, 2000
6089345 Elastic wave exploration tool for wells Jul. 18, 2000
6002648 Slotted cylinder marine siesmic method and source Dec. 14, 1999
6002649 Tapered cylinder electro-acoustic transducer with reversed tapered driver Dec. 14, 1999
5992077 Nose cone and method for acoustically shielding an underwater vehicle sonar array Nov. 30, 1999
5956293 Flexural plate sound transducer having low resonant frequency Sep. 21, 1999
5907521 Ultrasonic range finder using ultrasonic sensor May. 25, 1999
5867450 State switched acoustic transducer Feb. 2, 1999
5828761 Sound amplification system having a submersible microphone Oct. 27, 1998
5768216 Flexitensional transducer having a strain compensator Jun. 16, 1998
5750272 Active and adaptive damping devices for shock and noise suppression May. 12, 1998
5751659 Ceramic mass loaded longitudinal vibrator May. 12, 1998
5748566 Ultrasonic transducer May. 5, 1998

1 2 3

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