Patents by Inventor Theodore E. Ludden

Theodore E. Ludden 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).

  • Troll meter
    Patent number: 4548073
    Abstract: This troll meter is used to determine the speed of a boat in the range of one to three knots. Primarily, it consists of a shaft having three marked and different pitched propellers, which are rotated by the forward speed of the boat, and each is freely and rotatably received on shaft 11.
    Type: Grant
    Filed: April 12, 1984
    Date of Patent: October 22, 1985
    Inventor: Theodore E. Ludden