Patents by Inventor Claus Freimuth

Claus Freimuth 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).

  • Pump with screw conveyors on each end
    Patent number: 4558985
    Abstract: An annular nonreturn valve is provided in a pump with a screw conveyor mounted at each end. This nonreturn valve seals the outlet end of the pump. It also makes it possible for the conveyed material to be discharged without deflection in the slug area. The pivotability of the sealing element is made possible by the fact that the screw conveyor shaft has a smaller diameter in the direction of conveying behind the annular nonreturn valve. An area with enlarged diameter of the screw conveyor shaft can be provided on a casing so that wear parts can be easily replaced.
    Type: Grant
    Filed: June 29, 1983
    Date of Patent: December 17, 1985
    Assignee: Claudius Peters AG
    Inventors: Alfred Fischer, Claus Freimuth, Roland Gerlach, Gerhard Siefert