Patents by Inventor Koon Keung Tsang

Koon Keung Tsang 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).

  • Household appliance having plural coaxially rotatable or parallel linearly movable heads or tools
    Patent number: 6032313
    Abstract: A household appliance of the type in which a cleaning, polishing, or massaging effect is obtained by a rotating head or tool is improved by splitting the cleaning, polishing, or massaging head or tool into concentric or parallel multiple heads or tools arranged for coaxial or side-by-side differential motion.
    Type: Grant
    Filed: May 6, 1997
    Date of Patent: March 7, 2000
    Inventor: Koon Keung Tsang