Patents by Inventor Karl Friedrich Schweitzer

Karl Friedrich Schweitzer 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).

  • Cutting and feeding mechanism for suction inlet
    Patent number: 4024655
    Abstract: A suction pipe device for suction dredgers having at least two functionally opposed combined cutter and crusher tools mounted near the bottom opening of the suction pipe, to cut and crush and feed material to be dredged.
    Type: Grant
    Filed: July 7, 1975
    Date of Patent: May 24, 1977
    Inventor: Karl Friedrich Schweitzer