Patents by Inventor David W. Simpson

David W. 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).

  • Patent number: 12680602
    Abstract: A gearbox dampening system configured to absorb axial movement of the crank of the airboat engine to reduce damage causing vibration and noise is disclosed. The gearbox dampening system enables a gearbox to be releasably coupled to outer support structures of an engine to support the gearbox and enables one or more gears of the gearbox to be in communication with a crank of an airboat engine via one or more dampeners. In at least one embodiment, the one or more dampeners significantly reduces stresses imparted on the gears of the gearbox via axial movement of the crank of the engine created when the engine is running. In particular, axial movement of the crank of the engine, which would usually create noise, chatter and engine damage, is absorbed by the dampeners positioned between the crank and the one or more gears in the gearbox supporting an airboat propeller.
    Type: Grant
    Filed: January 30, 2023
    Date of Patent: July 14, 2026
    Assignee: Simpson Quality Designs, Inc.
    Inventor: David W. Simpson
  • Patent number: 11179987
    Abstract: An airboat rudder that results in increased turning force on the airboat while also being easily controlled by the airboat driver is disclosed. Airboats can be configured to run on both water and dry ground. Many times, somewhat dry mud and some types of grass are very difficult to run over and will cause an airboat to get stuck. One way of getting an airboat free is to oscillate the one or more airboat rudders from a hard right hand turn to a hard left hand turn. Doing so creates lateral forces on the airboat from both directions at different times causing the back of the airboat to move to the side and slightly forward as well. The airboat rudder disclosed herein increases the amount of lateral force generated on the airboat without increasing the horsepower of the airboat engine, which is highly desirable.
    Type: Grant
    Filed: July 13, 2020
    Date of Patent: November 23, 2021
    Inventor: David W. Simpson
  • Patent number: PP24394
    Abstract: A new and distinct cultivar of strawberry plant ‘Mayflower’ characterized by its firm berries that are tolerant to rain, and bright red in color and by its vigorous growth habit with tolerance to Phytophthora cactorum.
    Type: Grant
    Filed: February 15, 2012
    Date of Patent: April 22, 2014
    Assignee: East Mailing Research
    Inventor: David W. Simpson