Patents by Inventor Manfred Zirbs

Manfred Zirbs 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).

  • Seal for pneumatic, hydraulic or hydropneumatic units
    Patent number: 4750594
    Abstract: In a fluid-operated device such as a gas spring a piston rod is axially movably guided through a passage in an end wall of the gas spring. A sealing disc of elastomeric material is axially compressed between two supporting faces and engages the piston rod with a convex radially inner edge. The apex of the edge is substantially midway of the axial thickness of the sealing disc. Preferably the sealing disc has also a radially outwardly convex sealing edge which is in sealing engagement with a stationary face surrounding the sealing disc.
    Type: Grant
    Filed: July 28, 1986
    Date of Patent: June 14, 1988
    Assignee: Stabilus GmbH
    Inventors: Martin Siemann, Manfred Zirbs