Patents by Inventor Hubert Bernd

Hubert Bernd 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).

  • Means for feeding fluid into a pressure conduit
    Patent number: 4943212
    Abstract: Connected to a pressure conduit are a plurality of fixed displacement pumps and a variable displacement pump which are connectable and disconnectable in accordance with the amount of fluid withdrawn. The maximum delivery rate of the variable displacement is greater than the delivery rate of each fixed displacement pump. For the minimum and maximum delivery rate of the variable displacement pump two switching points are defined at each of which a fixed displacement pump is connected or disconnected. This gives a reliable fluid supply of the pressure conduit without any danger of erroneous switchings.
    Type: Grant
    Filed: November 23, 1988
    Date of Patent: July 24, 1990
    Assignee: Mannesman Rexroth GmbH
    Inventors: Hubert Bernd, Pierre Heiby, Alfred Sitter