Patents by Inventor John Chun Kuen Sham

John Chun Kuen Sham 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: 6571421
    Abstract: The vacuum cleaner and steamer apparatus of the present invention has a fluid assembly for generating and delivering true steam to a surface to be cleaned and a vacuum assembly for drawing deposited steam and other matter from the surface. The apparatus also includes a cleaning fluid reservoir for holding cleaning fluid and a waste reservoir for holding vacuumed matter. Preferably, both reservoirs are removable. Highly preferred embodiments have a housing 20 within which the cleaning fluid and waste reservoirs are received and retained. The fluid assembly preferably includes the cleaning fluid reservoir, a fluid pump for pumping cleaning fluid therefrom, a heater within which the cleaning fluid is turned into steam, and a sprayer head for spraying the steam upon the surface to be cleaned. The vacuum assembly preferably includes a vacuum fan driven by an electric motor, a vacuum head through which matter is drawn, and the waste reservoir.
    Type: Grant
    Filed: October 3, 2000
    Date of Patent: June 3, 2003
    Inventors: John Chun Kuen Sham, Kumkit Kunavongvorakul