Patents by Inventor C. Mack Ellison

C. Mack Ellison 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).

  • Gate valve
    Patent number: 5090661
    Abstract: Gate valve having a primary seal, actuated by fluid pressure in the flow conduit, for preventing leakage along the gate member on the upstream side of the gate valve and a secondary seal actuated by fluid pressure upon leaking of the primary seal and including a self-actuating relief means to prevent build-up of fluid pressure in the valve body in excess of the pressure in the flow conduit.
    Type: Grant
    Filed: September 28, 1990
    Date of Patent: February 25, 1992
    Assignee: Foster Oilfield Equipment Co.
    Inventors: Glenn C. Parks, Jr., C. Mack Ellison, William L. Godare, John Beson
  • Blowout preventer ram lock and locking method
    Patent number: 4052995
    Abstract: A new and improved ram lock for blowout preventer rams which permits locking of the ram at multiple and adjustable positions to compensate for wear on sealing elements of blowout preventer rams and increase sealing action of the ram without requiring separate special control lines. Automatic locking of the ram at a desired position, such as in sealing position, is obtained.
    Type: Grant
    Filed: August 19, 1975
    Date of Patent: October 11, 1977
    Assignee: Hydril Company
    Inventor: C. Mack Ellison