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Class Information
Number: 367/182
Name: Communications, electrical: acoustic wave systems and devices > Signal transducers > Receivers > Moving coil
Description: Subject matter in which acoustic wave forces move an electric coil relative to a ferromagnetic core so as to induce electric signals in the coil.










Sub-classes under this class:

Class Number Class Name Patents
367/184 Having arcuate movement 3
367/183 Spider spring 20


Patents under this class:

Patent Number Title Of Patent Date Issued
8638956 Acoustic velocity microphone using a buoyant object Jan. 28, 2014
8305845 Methods and systems for seismic signal detection Nov. 6, 2012
8208347 Geophone having improved damping control Jun. 26, 2012
8098546 Geophone having improved sensitivity Jan. 17, 2012
8027225 Methods and systems for seismic sensors Sep. 27, 2011
7961553 Sensory signal output apparatus Jun. 14, 2011
7929379 Methods and systems for seismic sensors Apr. 19, 2011
7639566 Geophone securement mechanism Dec. 29, 2009
7443766 Sensor assembly Oct. 28, 2008
7406002 Method and apparatus for the acquisition of seismic movements Jul. 29, 2008
7099235 Geophone and method of manufacturing a geophone Aug. 29, 2006
6922374 Double-ended geophone Jul. 26, 2005
6618325 Method and apparatus for controlling damping and in situ determination of frequency response for high bandwidth force-balance single-coil geophone Sep. 9, 2003
6483778 Systems and methods for passively compensating transducers Nov. 19, 2002
6412592 Electrically inclination compensated device for picking up elastic waves Jul. 2, 2002
6075754 Single-coil force balance velocity geophone Jun. 13, 2000
5633463 Earthquake detector May. 27, 1997
5469408 High resolution geophone Nov. 21, 1995
5305288 Variable reluctance acoustic projector Apr. 19, 1994
5299176 Balanced armature transducers with transverse gap Mar. 29, 1994
5214620 Electrically driveable shockwave source May. 25, 1993
5199005 Electromagnetic drive assembly for under water sonar transducer Mar. 30, 1993
5172345 Geophone system Dec. 15, 1992
5117403 Above and below water sound transducer May. 26, 1992
5012457 Aquatic transducer system Apr. 30, 1991
4821245 Electromagnetic transducer Apr. 11, 1989
4764762 Earthquake alarm assembly Aug. 16, 1988
4757548 Speaker system and dome-shaped enclosure therefor Jul. 12, 1988
4689997 Motion detector suitable for detecting earthquakes and the like Sep. 1, 1987
4597070 Geophone Jun. 24, 1986
4538203 Passive mass-spring type of sensing device having electronic damping Aug. 27, 1985
4466084 Seismometer Aug. 14, 1984
4466083 Low frequency, broadband, underwater sound transducer Aug. 14, 1984
4159464 Geophone with damping coil Jun. 26, 1979
4152692 Low distortion, high sensitivity seismometer May. 1, 1979
4051718 Apparatus for measuring the velocity of low frequency vibrations Oct. 4, 1977











 
 
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