Patents by Inventor Albrecht Kessler

Albrecht Kessler 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 and hydraulic pilot control
    Patent number: 8322375
    Abstract: A control device for controlling a hydraulic consumer, is equipped with a distributing valve having a control pressure chamber and a control slide that can be displaced against the force of a spring by the build-up of a control pressure in the control pressure chamber. A pilot control valve controls the supply and discharge of control fluid into and out of the control pressure chamber. A release device is used to drive the control fluid out of the control pressure chamber, bypassing the pilot control valve.
    Type: Grant
    Filed: February 16, 2007
    Date of Patent: December 4, 2012
    Assignees: Robert Bosch GmbH, Liebherr France SAS
    Inventors: Frank Helbling, Günter Fertig, Albrecht Kessler, Josef Hessdörfer, Burkhard Knöll
  • Control Device and Hydraulic Pilot Control
    Publication number: 20090044872
    Abstract: A control device for controlling a hydraulic consumer, is equipped with a distributing valve having a control pressure chamber and a control slide that can be displaced against the force of a spring by the build-up of a control pressure in the control pressure chamber. A pilot control valve controls the supply and discharge of control fluid into and out of the control pressure chamber. A release device is used to drive the control fluid out of the control pressure chamber, bypassing the pilot control valve.
    Type: Application
    Filed: February 16, 2007
    Publication date: February 19, 2009
    Inventors: Frank Helbling, Gunter Fertig, Albrecht Kessler, Josef Hessdorfer, Burkhard Knoll
  • Pilot controlled pressure relief valve
    Patent number: 5036877
    Abstract: The invention refers to a pilot controlled pressure relief valve comprising a pair of fluid ports to be operable in both directions of flow. The pressure relief valve is provided with a single pilot control valve 24 which allows for an equal actuating pressure in both flow directions.
    Type: Grant
    Filed: June 26, 1990
    Date of Patent: August 6, 1991
    Assignee: Mannesmann Rexroth GmbH
    Inventors: Josef Distler, Albrecht Kessler