Patents by Inventor Karl Kirschenhofer

Karl Kirschenhofer 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).

  • Device for stepping up or transmitting forces and strokes
    Patent number: 5186151
    Abstract: A device works according to the displacement principle, i.e., at least two displacers are provided in a common displacer working chamber or in displacer working chambers communicating with one another, and are drivingly coupled together by a pressure transmission medium. Elastomer material is disposed as the pressure transmission medium, at least in the region of one displacer.
    Type: Grant
    Filed: June 15, 1992
    Date of Patent: February 16, 1993
    Assignee: Mercedes-Benz AG
    Inventors: Paul Schwerdt, Dieter Dorrie, Karl Kirschenhofer
  • Piezoelectric control valve for controlling fuel injection valve in internal-combustion engines
    Patent number: 4813601
    Abstract: A piezoelectric control valve, for motor fuel injection via an injection valve, includes a hydraulic play-compensation element inside the control valve on the one side, which automatically compensates for possible changes in length of the reference system as a result of piezoceramic setting actions in the piezoelectric actuator so that, at the same working stroke of the piezoelectric actuator, an identical stroke at the valve is also always ensured. A hydraulic stroke transmission inside the control valve on the other side, provide a valve stroke corresponding to a multiple of the working stroke.
    Type: Grant
    Filed: February 16, 1988
    Date of Patent: March 21, 1989
    Assignee: Daimler-Benz Aktiengesellschaft
    Inventors: Paul Schwerdt, Karl Kirschenhofer