Patents by Inventor James K. Fretwell

James K. Fretwell 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).

  • Multi-function valve
    Patent number: 5247959
    Abstract: A multi-function valve has a floating disc (24) with concentric annular ribs (25,27) on one face for cooperation with respective first and second seatings, and an annular rib (26) on its other face for cooperation with a third seating.
    Type: Grant
    Filed: April 2, 1992
    Date of Patent: September 28, 1993
    Assignee: Meggitt (UK) Limited
    Inventor: James K. Fretwell