Patents by Inventor Alfred K. Hunziker

Alfred K. Hunziker 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).

  • Gear pump
    Patent number: 5253988
    Abstract: Method and apparatus for on-site cleaning of a gear pump by coupling the gear pump outlet to the gear pump inlet and to the inlet end of the passage and which bypasses the bearing and is preferably controlled by a valve element which can block off the bypass in normal operation and be opened for a cleaning operation to increase the pressure on the side of the bearing connected to the inlet and thereby increase the velocity of the flushing stream.
    Type: Grant
    Filed: February 27, 1992
    Date of Patent: October 19, 1993
    Assignee: Maag Pump Systems AG
    Inventors: Alfred K. Hunziker, Fritz Haupt, Eduard Mischler, Stefan Kalt