Patents by Inventor Robert K. Pfleger

Robert K. Pfleger 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).

  • Liquid metering pump
    Patent number: 4236881
    Abstract: A liquid metering pump has power-operated poppet valves in its intake and return conduits. The quantity of liquid discharged is controlled by a movable cam which determines how long the liquid return conduit is open. A switch operated by a portion of a pumping diaphragm prevents excess pressure from damaging the pump.
    Type: Grant
    Filed: May 3, 1978
    Date of Patent: December 2, 1980
    Assignee: Ecodyne Corporation
    Inventor: Robert K. Pfleger