Patents by Inventor Stephan R. Konrad

Stephan R. Konrad 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).

  • Marine propeller with addendum
    Patent number: 4865520
    Abstract: A marine propeller (4) has a plurality of blades (12, 13, 14, and 15) each with an integral addendum (34) extending rearwardly from the trailing edge (30) of the positive pressure surface (26) of the blade. A particular combination of blade area ratio and blade rake is provided to enable quick acceleration to a high-speed on-plane condition in blade surfacing racing applications, and without bobbing up and down. The blade area ratio is at least 40%, and the blade rake is 10.degree. to 25.degree..
    Type: Grant
    Filed: October 6, 1988
    Date of Patent: September 12, 1989
    Assignee: Brunswick Corporation
    Inventors: Robert H. Hetzel, Stephan R. Konrad