Patents by Inventor Rolf Karrer

Rolf Karrer 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).

  • Process for controlling the pressure of a CVT during a standing start
    Patent number: 6135916
    Abstract: A pressure controlling system for a CVT of the belt with bevelled pulley type is proposed in which, on detection of a shift from the neutral or park position, the pressure in the primary and secondary pulleys is raised to a first level. This ensures that the variator (1) can transmit the full torque on initiation of a drive operation.
    Type: Grant
    Filed: August 17, 1998
    Date of Patent: October 24, 2000
    Assignee: ZF Friedrichshafeb AG
    Inventors: Ralf Vorndran, Rolf Karrer