Patents by Inventor Hans-Dieter Kokus

Hans-Dieter Kokus 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).

  • Patent number: 4242942
    Abstract: A hydraulic control arrangement with a feedback device for positioning an implement comprises a positioner including a fluid operated cylinder and piston unit, the piston of which is connected by a plurality of linkage elements to the implement. A first pump delivers through a pressure line fluid under pressure into the cylinder. A two-port three-position valve is interposed in the pressure line movable from a neutral position in which the fluid fed by the first pump is directed to a reservoir, to two operating positions to opposite sides of the neutral position, and in which one of the operating positions fluid fed by the first pump passes into the cylinder and in the other of the operating positions fluid from the cylinder can flow to the reservoir. A pair of pilot chambers are arranged at opposite ends of the valve for moving the latter from the neutral to either of the working positions. A second pump provides fluid under pressure for operating the valve.
    Type: Grant
    Filed: March 19, 1979
    Date of Patent: January 6, 1981
    Assignee: G. L. Rexroth GmbH
    Inventors: Reiner Bartholomaus, Karl-Heinz Bernhardt, Wolfgang Eberhard, Hans-Dieter Kokus, Herbert Lembke, Heinz Schulte