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Class Information
Number: 367/179
Name: Communications, electrical: acoustic wave systems and devices > Signal transducers > Receivers > Pendulum type
Description: Subject matter wherein a body suspended from a fixed point swings in an arcuate manner in response to incident acoustic wave energy.

Patents under this class:

Patent Number Title Of Patent Date Issued
6751162 Seismic sensor Jun. 15, 2004
6363035 Seismic sensor having two symmetrical leaf springs and a method for detecting seismic movement Mar. 26, 2002
6205088 Thermal graphic pen and method of use Mar. 20, 2001
5983699 Clamping mechanism for inertial pendulum instruments Nov. 16, 1999
5414677 Ground movement sensor May. 9, 1995
5408457 Device for detecting seismic motion Apr. 18, 1995
4928263 Hydrophones and similar devices May. 22, 1990
4897824 Sonar systems Jan. 30, 1990
4615022 Symmetrically-suspended vertical-swing long-period pendulum means Sep. 30, 1986
4280206 Seismometers Jul. 21, 1981
4117496 Earthquake recording device Sep. 26, 1978
4010443 Velocity pickups of the horizontal seismometer type Mar. 1, 1977
3990039 Tuned ground motion detector utilizing principles of mechanical resonance Nov. 2, 1976

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