Patents Assigned to Hydra-Troll, Inc.
  • Trolling driving means for boat
    Patent number: 4200055
    Abstract: This invention relates to a trolling propeller in connection with an inboard-outboard type of boat in which the improvement consists of mounting the trolling propeller onto the main propeller assembly without requiring any adjustment of the relative positions of the main and trolling propellers with respect to the boat and in utilizing the main power source to drive a main propeller or to drive the trolling propeller.
    Type: Grant
    Filed: December 21, 1978
    Date of Patent: April 29, 1980
    Assignee: Hydra-Troll, Inc.
    Inventor: Dale Siegel