Patents by Inventor Wylie W. Mitchell

Wylie W. 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).

  • Twin positive and negative seal pipe fittings
    Patent number: 4130302
    Abstract: The invention provides a seal for pipe joint couplings, the present seal comprising a sleeve member receivable over the pipe joint and extending for a relatively short distance along each of the pipes. The seal further comprises an annular pressure chamber formed in the inner wall of the sleeve facing each of the pipes, the outer surface of each pipe acting to define the chamber, each pressure chamber being partially positioned into two sub-chambers by an inwardly extending annular bead formed on the sleeve, the sub-chambers each having packings such as O-rings disposed therein.
    Type: Grant
    Filed: July 18, 1977
    Date of Patent: December 19, 1978
    Assignees: Clyde A. Robdell, Leonard B. Rodbell, Paul N. Rodbell, Sidney P. Rodbell, Arthur T. Rodbell
    Inventors: Wylie W. Mitchell, Gordon W. Arrowood