Patents by Inventor David H. Patrick

David H. Patrick 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).

  • Pipe joint seal rings
    Patent number: 4711474
    Abstract: An improved seal ring comprising a polymeric material ring in combination with a softer polymeric material ring. The seal ring can be used in either male or female fittings and is adapted to seal by mating engagement of the polymeric material with one set of threads and a recess in the other set of threads.
    Type: Grant
    Filed: October 21, 1986
    Date of Patent: December 8, 1987
    Assignee: Atlantic Richfield Company
    Inventor: David H. Patrick