Patents by Inventor Mark Popjoy

Mark Popjoy 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).

  • Gas spring with an anti-rattle piston assembly
    Patent number: 4989700
    Abstract: Rattling of the piston against the tube in a gas spring due to transient lateral loads on the piston are inhibited by engagement of the base of the piston ring groove with internal projections of a serrated inner edge of the sealing ring. Assurance against seizure of the sealing ring to the piston and preservation of a minimum width of the face seal between the sealing ring and the ringland to ensure against leakage are provided.
    Type: Grant
    Filed: December 28, 1989
    Date of Patent: February 5, 1991
    Assignee: Fichtel & Sachs Industries, Inc.
    Inventor: Mark Popjoy