Patents by Inventor Ted Lee Butterfield

Ted Lee Butterfield 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).

  • Unloader valve for spray guns
    Patent number: RE28842
    Abstract: An unloader type valve for spray guns supplied from pumps to limit operating pressures of the pump when the spray gun is stopped. The valve utilizes an adjustable spring to select pressure forces for opening the valve and a variable flow passage from the valve to an outlet when the valve is open, the allowing matching of the valve to the precise operating pressures and flow rates in spray gun and pumping system installations.
    Type: Grant
    Filed: July 18, 1974
    Date of Patent: June 8, 1976
    Assignee: Spraying Systems Co.
    Inventor: Ted Lee Butterfield