Patents by Inventor Mark A. Stonehill

Mark A. Stonehill 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).

  • Bonded piston and seal assembly
    Patent number: 5492053
    Abstract: A piston and seal assembly that has a rigid core with an elastomeric seal bonded thereto. The core has an annular outer cylindrical edge, a forwardly facing surface and a rearwardly facing surface. The elastomeric member is bonded to the core so as to encase the annular cylindrical edge. The elastomeric member extends outboard of the rearwardly facing surface of the core to provide a sealing lip. An annular concave surface merges with an annular convex surface located axially rearwardly of the rearward facing surface on the core. A radially outwardly directed surface on the lip portion merges tangentially with the convex surface.
    Type: Grant
    Filed: December 14, 1994
    Date of Patent: February 20, 1996
    Assignee: General Motors Corporation
    Inventor: Mark A. Stonehill