Patents by Inventor Werner Herfs

Werner Herfs 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 circuit for a priority and for a secondary hydraulic consumer
    Patent number: 6289675
    Abstract: The invention concerns a hydraulic control circuit in which the pressure medium conveyed by a hydraulic pump of variable delivery (10) is fed, in each case via a metering aperture (17, 31), as a priority to a first hydraulic consumer (14) and only secondly to a second hydraulic consumer (15). A priority control system is now produced without additional delivery losses and with sufficient amounts of pressure medium being conveyed in that the valve member (48) of the priority valve (45) can be acted upon in the closure direction of the connection between the first connection (46) and the second connection (47) by a pressure prevailing in a line section (13) upstream of the first metering aperture (17).
    Type: Grant
    Filed: July 27, 1999
    Date of Patent: September 18, 2001
    Assignee: Mannesmann Rexroth AG
    Inventors: Werner Herfs, Jacques Maffini, Thomas Weickert