Patents by Inventor Fred W. Hefer

Fred W. Hefer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Printed-circuit disc for stringing geophones
    Patent number: 4594698
    Abstract: This invention includes a seismic detector located in the bottom portion of a casing. The upper portion of said casing contains a printed circuit disc. The printed circuit disc is provided to serve as a junction between the conductor wires of the geophone leader cable and the geophone's terminals, and to anchor the geophone leader cable to the geophone casing.
    Type: Grant
    Filed: October 23, 1984
    Date of Patent: June 10, 1986
    Assignee: Oyo Corporation
    Inventor: Fred W. Hefer
  • Horizontal geophone transducer assembly
    Patent number: 4525819
    Abstract: The geophone transducer comprises in combination: a geophone capable of detecting horizontal seismic waves, and a rigid casing having a gimbal chamber. A gimbal is provided inside the chamber on which the geophone is mounted for limited free angular movement in one direction only. The gimbal includes in one preferred embodiment a viscous liquid in which the geophone is only partially submerged while it is supported by a U-shaped bracket which is mounted for rotation about a fixed axis.
    Type: Grant
    Filed: December 6, 1982
    Date of Patent: June 25, 1985
    Assignee: Oyo Corporation, U.S.A.
    Inventor: Fred W. Hefer