Patents by Inventor Sanford Campbell

Sanford Campbell 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).

  • Variable output pressure backup valve
    Publication number: 20050155655
    Abstract: A backup valve for use with a pool cleaner coupled to a source of water under pressure. The valve includes a housing having an inlet and at least a first outlet and a second outlet. The valve further includes a timing apparatus directing water from said inlet to the first outlet or the second outlet. In addition, an adjustable flow controller over the second outlet is provided to increase the flow speed of fluid exiting the outlet.
    Type: Application
    Filed: January 21, 2004
    Publication date: July 21, 2005
    Inventors: Sanford Campbell, Suresh Gopalan
  • Suction flow regulator
    Patent number: 6357478
    Abstract: A suction control regulator for a suction cleaner, comprising: a y-shaped housing having an inlet and an outlet, and a regulator section; a valve mount positioned in the regulator section; a valve having a stem adapted to be received in the valve mount; a window in the regulator section; and a cap having a tapered bore engaging the valve, and a threads adapted to engage the regulator section such that rotation of the cap seals or opens the window and the tapered bore.
    Type: Grant
    Filed: October 17, 2000
    Date of Patent: March 19, 2002
    Assignee: Letro Products, Inc.
    Inventors: Sanford Campbell, Suresh Cherulassery Gopalan