Patents by Inventor Larry J. Phillips

Larry J. Phillips 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).

  • Valve operator control system
    Patent number: 4518146
    Abstract: A control system for a valve actuator which is subject to oppositely directed displacement due to thermal expansion and spring forces has sensor switches which detect successively greater amounts of compression of a spring which compresses to accommodate thermal expansion of the valve, its stem and seat when the valve is seated in closed position. A position servomechanism which is responsive to the position of the stem and a control signal operates a motor for advancing and retracting the stem.
    Type: Grant
    Filed: April 28, 1983
    Date of Patent: May 21, 1985
    Assignee: General Signal Corporation
    Inventors: Walter J. Stinson, Larry J. Phillips