Self-clearing Patents (Class 440/73)
  • Marine propeller defouling device
    Patent number: 4304559
    Abstract: Flexible linear members trail between the blades of a forward-moving marine shaft-driven propeller and impinge upon the blade surface to defoul the propeller blades.
    Type: Grant
    Filed: February 21, 1980
    Date of Patent: December 8, 1981
    Assignee: Thomas Y. Awalt, Jr.
    Inventor: Aroney M. Steward
  • Self-cleaning weedless propeller
    Patent number: 4246862
    Abstract: A self cleaning attachment for a propeller shaft having a gear box mounting parallel stub shafts driven in the same direction by a common gear, screw propeller surfaces on the shafts with teeth on the outer edge of each propeller surface and having weed shearing clearance with the shaft of the other surface, and stub shear bars supported in fixed relation to the box and disposed radially outward and parallel to the shafts with which the teeth also have weed shear clearance with the bars.
    Type: Grant
    Filed: March 7, 1979
    Date of Patent: January 27, 1981
    Inventor: Troy M. Deal
  • Weed guard for electric trolling motors
    Patent number: 4224893
    Abstract: A weed guard for electric trolling motors including a generally semi-cylindrical lower portion to embrace the bottom portion of the electric motor and a forwardly upwardly angle portion from the lower portion, terminating at a point somewhat above the normal water line.
    Type: Grant
    Filed: April 19, 1978
    Date of Patent: September 30, 1980
    Inventor: Andy F. Vollmar