Patents by Inventor Duke M. Fox

Duke M. Fox 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).

  • Two cycle engine with peripheral bypass for piston head and method of manufacture
    Patent number: 3971297
    Abstract: The invention provides a bypass around virtually the entire periphery of a piston in a two cycle engine without substantially increasing costs or obsoleting production tooling. This is done by reshaping a cavity formed inside an engine casting to enlarge the crank case opening and to provide three oppositely displaced bypasses. The fourth side of the piston is open to the exhaust port. Therefore, virtually the entire perimeter of the piston is bypassed to greatly increase power by improved breathing.
    Type: Grant
    Filed: May 24, 1974
    Date of Patent: July 27, 1976
    Assignee: Fox Manufacturing Company
    Inventor: Duke M. Fox