Patents by Inventor Douglas James Simpson

Douglas James Simpson 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).

  • High-lift, low drag fin for surfboard and other watercraft
    Patent number: 7244157
    Abstract: This invention discloses a fin, for use on a surfboard and other watercraft, of a low-drag, high-lift, high-aspect-ratio, low-sweepback-angle planform of symmetrical foil section, with a fit root section that has a forwardly projecting leading edge and cutaway at the trailing edge, alone or in combination with winglets placed on the vertical fin element so as to minimize tip-vortex drag, so as to make the surfboard or watercraft more maneuverable, easier to propel through the water, and to stabilize the surfboard or watercraft.
    Type: Grant
    Filed: October 25, 2005
    Date of Patent: July 17, 2007
    Inventor: Douglas James Simpson