Patents by Inventor Lee M. Hollingsworth

Lee M. Hollingsworth 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).

  • Pressure-actuated wellhead sealing assembly
    Patent number: 4381868
    Abstract: An improved heat resistant seal assembly for sealing across an annular recess between the interior of a wellhead member and the exterior of a tubular member including a heat resistant seal ring in the recess, a pressure responsive ring for moving the seal ring into sealing position in the recess, latching means to retain the pressure responsive ring in set position and spring means between the seal ring and the pressure responsive ring to maintain a sealing force on the seal ring.
    Type: Grant
    Filed: July 24, 1981
    Date of Patent: May 3, 1983
    Assignee: Cameron Iron Works, Inc.
    Inventors: David G. Croy, Lee M. Hollingsworth, Leonard E. Williams, Jr., Richard D. Jolly, Mark C. Tate