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: 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: 7789034
    Abstract: A suspension system for an airboat is disclosed. The suspension system may support a seating system on an airboat and may be configured to absorb forces from waves, running over dry ground, et cetera. The suspension system may include one or more dampers configured to absorb forces to smooth out the ride on the airboat. In at least one embodiment, the suspension system may include adjustable dampers that enable the amount of dampening to be adjusted to accommodate different loads, such as more or less people seated on the airboat.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: September 7, 2010
    Inventor: David W. Simpson, Sr.
  • Patent number: 6109362
    Abstract: A multi-purpose hand tool, comprising: first, second, third and fourth flat rectangular sections connected edgewise to one another in succession and having a cross-section defining a concave side, the first and fourth sections being outer sections and the second and third sections being inner sections with respect to the concave cross-section; and, a handle attached to and extending perpendicularly from one of the inner sections, outwardly from the concave side, whereby the sections form a multi-purpose grading blade that can be used for pushing, pulling, smoothing and tamping. The first and second sections are attached at a first angle in a range of 15.degree. to 30.degree., the second and third sections are attached at a second angle in a range of 30.degree. to 50.degree. and the third and fourth sections are attached at a third angle in a range of 30.degree. to 50.degree..
    Type: Grant
    Filed: May 29, 1998
    Date of Patent: August 29, 2000
    Inventor: David W. Simpson, Sr.
  • Patent number: D452424
    Type: Grant
    Filed: March 21, 2001
    Date of Patent: December 25, 2001
    Inventor: David W. Simpson, Sr.
  • Patent number: D469497
    Type: Grant
    Filed: March 7, 2001
    Date of Patent: January 28, 2003
    Inventor: David W. Simpson, Sr.
  • Patent number: D408696
    Type: Grant
    Filed: May 29, 1998
    Date of Patent: April 27, 1999
    Inventor: David W. Simpson, Sr.
  • Patent number: D412548
    Type: Grant
    Filed: February 12, 1999
    Date of Patent: August 3, 1999
    Inventor: David W. Simpson, Sr.
  • Patent number: D423627
    Type: Grant
    Filed: February 12, 1999
    Date of Patent: April 25, 2000
    Inventor: David W. Simpson, Sr.
  • 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