Patents by Inventor Norbert Gehrig

Norbert Gehrig 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 apparatus, in particular a 2-way proportional throttle valve
    Patent number: 4790511
    Abstract: A pilot-controlled proportional throttle valve is provided having pilot oil passage means provided in the spool of said throttle valve.
    Type: Grant
    Filed: September 12, 1986
    Date of Patent: December 13, 1988
    Assignee: Mannesmann Rexroth GmbH
    Inventors: Norbert Gehrig, Hans Wolfges