Patents by Inventor Douglas B. Hauff

Douglas B. Hauff 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).

  • Three tank carpet spotter
    Patent number: 6481048
    Abstract: A three-tank carpet spot cleaning device having a cleaning fluid tank, a rinse water tank, and a recovery tank. In use, a user uses cleaning fluid to spot treat the spot, and then is able to rinse all residue of the cleaning fluid from the carpet using the rinse water.
    Type: Grant
    Filed: June 13, 2000
    Date of Patent: November 19, 2002
    Assignee: Palouse Holdings LLC
    Inventors: Douglas B. Hauff, Dennis C. Duerr, Steven G. Williams