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Class Information
Number: 367/185
Name: Communications, electrical: acoustic wave systems and devices > Signal transducers > Receivers > Moving magnet
Description: Subject matter wherein acoustic wave forces move a permanent magnet relative to an electric coil in such a way as to induce an electric signal in the coil.

Sub-classes under this class:

Class Number Class Name Patents
367/186 Having arcuate movement 2
367/187 Spider spring 15

Patents under this class:

Patent Number Title Of Patent Date Issued
8687465 Methods and systems for seismic signal detection Apr. 1, 2014
8593910 Permanent seismic source Nov. 26, 2013
8098546 Geophone having improved sensitivity Jan. 17, 2012
8050144 Vertical geophone having improved distortion characteristics Nov. 1, 2011
7518954 Motion transducer Apr. 14, 2009
7443766 Sensor assembly Oct. 28, 2008
7406002 Method and apparatus for the acquisition of seismic movements Jul. 29, 2008
7292504 Seismic sensors Nov. 6, 2007
6832518 Pressure wave sensor using levitated mass Dec. 21, 2004
6799462 Gravimetric measurement method and system Oct. 5, 2004
5694375 Ultra-broadband hydrophone Dec. 2, 1997
5625348 Method and apparatus for detecting local precursor seismic activity Apr. 29, 1997
5565665 Magnetic suspension seismometer Oct. 15, 1996
5432758 Electroacoustic transducer Jul. 11, 1995
5425002 Acoustic pressure pulse generator Jun. 13, 1995
5268879 Electro-acostic transducers Dec. 7, 1993
5256920 Acoustic transducer Oct. 26, 1993
5172345 Geophone system Dec. 15, 1992
5126979 Variable reluctance actuated flextension transducer Jun. 30, 1992
5119345 Geophone Jun. 2, 1992
5117403 Above and below water sound transducer May. 26, 1992
4792931 Optical seismic detector Dec. 20, 1988
4618949 Self-orienting directionally sensitive geophone Oct. 21, 1986
4603407 Rotational geophone Jul. 29, 1986
4597070 Geophone Jun. 24, 1986
4517514 Vibration transducer with dual opposed magnetic assemblies and counterbalanced mass May. 14, 1985
4412317 Transducer for picking up mechanical vibrations, in particular seismic waves, and a seismic measuring system including such a transducer Oct. 25, 1983
4402382 Air gun fire time sensor Sep. 6, 1983
4301887 Acceleration-responsive apparatus for sensing firing instant of an air gun Nov. 24, 1981
4282484 Combination seismic/magnetic transducer with floating magnet Aug. 4, 1981
4266287 Transducer systems with controlled damping May. 5, 1981
3953829 Partially filled fluid damped geophone Apr. 27, 1976
3942606 Method of land seismic exploration using flexible tubes Mar. 9, 1976

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