Patents by Inventor Erhard Karl

Erhard Karl 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).

  • Hydraulic control arrangement
    Patent number: 7637103
    Abstract: Disclosed is a hydraulic control arrangement for damping wagging vibrations, wherein during operation a hydraulic cylinder of a lifting equipment can be connected to a hydraulic accumulator via a damping valve arrangement. The damping valve arrangement comprises a nozzle valve arrangement with two different nozzle cross-sections, the larger of which is active when filling the hydraulic accumulator and the smaller of which is active during adaptation of the hydraulic accumulator to the load pressure of the hydraulic cylinder.
    Type: Grant
    Filed: July 6, 2005
    Date of Patent: December 29, 2009
    Assignee: Bosch Rexroth AG
    Inventors: Erhard Karl, Edwin Harnischfeger
  • Hydraulic Control Arrangement
    Publication number: 20080104866
    Abstract: Disclosed is a hydraulic control arrangement for damping wagging vibrations, wherein during operation a hydraulic cylinder of a lifting equipment can be connected to a hydraulic accumulator via a damping valve arrangement. The damping valve arrangement comprises a nozzle valve arrangement with two different nozzle cross-sections, the larger of which is active when filling the hydraulic accumulator and the smaller of which is active during adaptation of the hydraulic accumulator to the load pressure of the hydraulic cylinder.
    Type: Application
    Filed: July 6, 2005
    Publication date: May 8, 2008
    Inventors: Erhard Karl, Edwin Harnischfeger