Patents by Inventor Philip N. Mitchell

Philip N. Mitchell 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).

  • Centrifugal seal
    Patent number: 5078410
    Abstract: A sealing member for sealing between a rotating surface (12) and a stationary cylindrical surface (13). The sealing member (8) is sealing engaged to the rotating surface (12) and is so constructed that) at a rotational speed greater than a predetermined speed of rotation of the rotating surface, the seal lip (27), due to centrifugal force, disengages from the stationary cylindrical surface (13) and, at or below the predetermined speed of rotation, sealingly engages the stationary cylindrical surface (13).
    Type: Grant
    Filed: October 30, 1989
    Date of Patent: January 7, 1992
    Assignee: Warman International Limited
    Inventors: Charles H. Warman, Anthony Grzina, Philip N. Mitchell, Denis J. Martin, deceased