Patents by Inventor Reiner Eisenmann

Reiner Eisenmann 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).

  • Flow regulating valve
    Patent number: 5405248
    Abstract: A flow regulating valve for rotation piston pumps to regulate a useful flow, especially for auxiliary power steering in motor vehicles, contains in a valve core (2) an axially-movable, spring-loaded flow regulating piston (3). On one front surface (4) of the flow regulating piston (3), there is a control edge (14) by means of which a flowoff cross section in a flowoff duct (15) can be altered. To reduce the flow noises, control edge (14) has a rounded portion (17) at the transition to the generated surface (16) of the flow regulating piston (3). In addition, control edge (14) reveals a negative bezel (18). A positive bezel (21) is arranged between this negative bezel (18) and the rounded portion (17) that adjoins generated surface (16).
    Type: Grant
    Filed: March 12, 1993
    Date of Patent: April 11, 1995
    Assignee: Zahnradfabrik Friedrichshafen AG
    Inventors: Ekkehard Alschweig, Ulrich Aldinger, Reiner Eisenmann