Patents by Inventor Gerd Ahrens

Gerd Ahrens 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).

  • Control device for a hydraulic system having at least two pumps
    Patent number: 4115033
    Abstract: A hydraulic system having at least two pumps including a variable-displacement pump and a constant-displacement pump, both driven from a common prime mover, includes a control-pressure pump operated by the shaft of the prime mover and operating with its input a valve which controls the pressure of a control piston acting upon a spring which bears upon the control member in a direction opposite to its setting piston. A cylinder of the setting piston is connected to the output of the adjustable-displacement pump.
    Type: Grant
    Filed: January 24, 1977
    Date of Patent: September 19, 1978
    Assignee: Linde Aktiengesellschaft
    Inventors: Gustav Kleineisel, Dietrich Kuchenbecker, Gerd Ahrens