Patents by Inventor Dean C. Minehart

Dean C. Minehart 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).

  • Power control system for subsurface formation testing apparatus
    Patent number: 4720996
    Abstract: Apparatus for collecting a plurality of samples of fluids in earth formations traversed by a wellbore includes control circuits for supplying power control signals to the subsurface instrument. The control circuits include circuitry for establishing electrical connection to the hydraulic power system of the instrument and after a preselected period of delay supplying power signals to a hydraulic pump motor and/or solenoid valve controls therein. Current is monitored by over-current protection circuitry. In the instance of a current overload, power signals are removed from the hydraulic power system and after a preselected period of delay the control circuits are disconnected from the instrument.
    Type: Grant
    Filed: January 10, 1986
    Date of Patent: January 26, 1988
    Assignee: Western Atlas International, Inc.
    Inventors: Michael J. Marsden, Dean C. Minehart