Patents by Inventor Karl-Gerd Friedrichs

Karl-Gerd Friedrichs 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).

  • Flat gasket
    Patent number: 4333663
    Abstract: A flat gasket has at least one opening and a metal frame surrounding the opening and attached to a gasket edge defining the opening. The frame has rims on both sides of the gasket and metal overlays arranged adjacent the frame in a face-to-face relationship with the gasket on both sides thereof. Each overlay is formed as a flap-like extension of the rims on both sides of the gasket along a linear length portion of the frame.
    Type: Grant
    Filed: December 13, 1979
    Date of Patent: June 8, 1982
    Assignee: Goetze AG
    Inventor: Karl-Gerd Friedrichs