Patents Assigned to Metrix Instrument Co.
  • Geophone having a non-conductive coilform
    Patent number: 4504932
    Abstract: A geophone having a non-conductive coilform thereby avoiding the disadvantages of conductive coilform damping and allowing closer control of both sensitivity and damping solely through shunt loading of the sensing coil. The coilform is a molded plastic coilform of a high strength lightweight glass filled resin. The coilform is a dimensionally stable and temperature stable thermoplastic. Preferably, the coilform is of polyphenylene sulfide.
    Type: Grant
    Filed: February 8, 1982
    Date of Patent: March 12, 1985
    Assignee: Metrix Instrument Co.
    Inventor: Peter C. Sundt