Patents by Inventor Henry Hilsenbeck

Henry Hilsenbeck 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).

  • Double action check valve
    Patent number: 5062448
    Abstract: A Double Action Check Valve is shown provided with a flexible membrane secured between the inlet and outlet members, the membrane having apertures or orifices interiorly of the perimeter; substantially ball-shaped members centrally carried on either side of the membrane and under increased volume of flow from the inlet or outlet side of the ball-shaped members carried by it move in concert with the membrane as the membrane is caused to bow out or flex on either side of the coupling member as dictated by the volume of flow.
    Type: Grant
    Filed: June 14, 1990
    Date of Patent: November 5, 1991
    Assignee: Henry Hilsenbeck
    Inventors: Henry Hilsenbeck, Jack E. Muck