Patents by Inventor Otto Grim

Otto Grim 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).

  • Patent number: 4623299
    Abstract: A driving arrangement for a watercraft includes a propeller and a freely pivoted guide wheel arranged subsequently to the propeller. The guide wheel which has a higher blade number and a smaller rotational speed than the propeller is provided with sectionized blades. One segment of each blade is propeller blade-like and extends outside the stream generated by the propeller and the other segment is turbine bucket-like and extends within the propeller stream. Upon equal rotational speed of the propeller and the guide wheel, the pitch of the respective segments is such that the pitch of the one segment which is outside the propeller stream is essentially constant in radial direction while the pitch of the other segment steadily increases radially from the one segment towards the hub on which the guide blade is arranged.
    Type: Grant
    Filed: January 14, 1985
    Date of Patent: November 18, 1986
    Assignee: Harmstorf AG
    Inventor: Otto Grim