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Class Information
Number: 367/187
Name: Communications, electrical: acoustic wave systems and devices > Signal transducers > Receivers > Moving magnet > Spider spring
Description: Subject matter having resilient means to support the magnet radially with respect to the coil in such a way as to permit relative movement of the magnet axially with respect to the coil.

Patents under this class:

Patent Number Title Of Patent Date Issued
8050144 Vertical geophone having improved distortion characteristics Nov. 1, 2011
7535351 Acoustic intrusion detection system May. 19, 2009
7338398 Continuously variable transmission or clutch with ortho-planar compliant mechanism Mar. 4, 2008
5734626 Synchronisation device comprising a time zone detector Mar. 31, 1998
5555222 Low distortion geophone spring Sep. 10, 1996
5450375 Geophone shock absorber Sep. 12, 1995
5134594 Geophone spring Jul. 28, 1992
5134593 Geophone spring Jul. 28, 1992
4685094 Lateral compliance device for geophone springs Aug. 4, 1987
4623991 Delta-shaped geophone spring Nov. 18, 1986
4504932 Geophone having a non-conductive coilform Mar. 12, 1985
4458344 Tapered geophone spring Jul. 3, 1984
4412317 Transducer for picking up mechanical vibrations, in particular seismic waves, and a seismic measuring system including such a transducer Oct. 25, 1983
4323994 Geophone spring Apr. 6, 1982
4285054 Geophone Aug. 18, 1981

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