Patents by Inventor Clyde D. Wilson

Clyde D. Wilson 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).

  • Hydraulic pumping apparatus and method of operation
    Patent number: 4645431
    Abstract: A hydraulically actuated pumping apparatus including a piston-driven, plunger-type injection pump in combination with a three-way normally closed pilot-operated relay valve, and a variable restrictor adjustable during operation of the pumping apparatus for controlling the flow of a pilot fluid to the relay valve. Pilot fluid is vented from the relay valve through passageways in the plunger of the injection pump at the completion of each pumping stroke.
    Type: Grant
    Filed: January 16, 1986
    Date of Patent: February 24, 1987
    Assignee: Sigma Enterprises, Inc.
    Inventors: Larry K. Spencer, Clyde D. Wilson, Robert Vanlangendonck