Patents by Inventor David J. Rawlins

David J. Rawlins 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).

  • Automatic swimming pool cleaner
    Patent number: 4686728
    Abstract: A pool cleaner for brushing the sides of a pool and vacuuming the debris therein which attaches to the existing pool pump negating the need for an auxiliary pump. The device employs an expanding air chamber that expands and contracts to control the buoyancy of the device. The flow of water is drawn into the base, passes through a valve system and out through the return pipe to the pool.
    Type: Grant
    Filed: March 1, 1985
    Date of Patent: August 18, 1987
    Inventor: David J. Rawlins
  • Vehicle tire
    Patent number: D307120
    Type: Grant
    Filed: August 22, 1986
    Date of Patent: April 10, 1990
    Assignee: SP Typres UK Ltd.
    Inventors: Peter Ingley, Gerald A. Griffiths, David J. Rawlins