Patents by Inventor Roland V. R. Martin

Roland V. R. Martin 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).

  • Weed resistant boat propeller
    Patent number: 5249993
    Abstract: A weed resistant boat propeller is disclosed. The propeller includes a generally circular hub that is adapted for mounting to and being rotatably driven by a boat motor. There are a plurality of blades mounted to a circumferential surface of the hub and extending therefrom in a spiral configuration. Each blade includes a curved leading edge that has an arc dy/dx<1 for the entire length of the leading edge.
    Type: Grant
    Filed: July 19, 1991
    Date of Patent: October 5, 1993
    Inventor: Roland V. R. Martin