Patents by Inventor David Francis Thompson

David Francis Thompson 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).

  • Joints
    Patent number: 6299216
    Abstract: A joint comprising a main seal, a secondary seal and an external pressure test port providing access to a cavity between the main seal and the secondary seal wherein the integrity of the main seal can be tested in its in-service direction by applying pressure to the cavity via the pressure test port such that the cavity is pressurised and the main seal is tested. Following testing of the main seal, the secondary seal may become redundant during normal use of the joint. In some embodiments, however, the integrity of the main seal can be retested at any time due to the reusability of the secondary seal.
    Type: Grant
    Filed: February 26, 1999
    Date of Patent: October 9, 2001
    Assignee: Codelast Limited
    Inventor: David Francis Thompson