Patents by Inventor Johannes Sperman

Johannes Sperman 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).

  • Lightweight piston
    Patent number: 7954421
    Abstract: A piston has a piston head that is provided with a field of rings and a piston shaft which is disposed thereupon. The piston shaft is equipped with supporting shaft wall sections and rear connecting walls which interconnect the shaft wall sections, have an arched shape, and are fitted with a bolt bore. An undercut free space is provided below the annular field in the area of the bolt bore in the region of the piston head. An arched zone is disposed in the interior of the piston at the transition from the bolt bore in the direction of the shaft wall session.
    Type: Grant
    Filed: August 26, 2006
    Date of Patent: June 7, 2011
    Assignee: KS Kolbenschmidt GmbH
    Inventors: Ralf Buschbeck, Johannes Sperman, Albert Haberl, Klaus Lormes