Patents by Inventor Tim Hegemier

Tim Hegemier 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).

  • Dry valve stem seal
    Patent number: 6318328
    Abstract: A valve stem seal assembly includes two annular hydraulic seals separated by a generally flat support member, where the seals are axially positioned back to back on an upper free end of a valve stem. The seals and the washer are secured along a radially outer circumference by a retainer, a lower portion of which contacts an upper surface of a valve guide. The valve stem is slideably sealed by an inner annular surface of both hydraulic seals.
    Type: Grant
    Filed: October 10, 2000
    Date of Patent: November 20, 2001
    Assignee: Dana Corporation
    Inventor: Tim Hegemier