Patents by Inventor Tao Shi Gao

Tao Shi Gao 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).

  • Magnetic writing screen dispersion medium
    Patent number: 6878306
    Abstract: A magnetic dispersion medium is used in a magnetic writing screen toy. The dispersion medium is attracted to the underside of the screen when a magnetic tipped pen is passed over the upper surface of the screen. A user can create drawings and figures. The dispersion medium is non-toxic, creates lines having good contrast and can be easily erased without permanently forming black marks on the screen. The dispersion medium works well in temperature ranges between ?20° C. to 45° C.
    Type: Grant
    Filed: August 24, 2001
    Date of Patent: April 12, 2005
    Assignee: Tsuen Lee Metals & Plastic Toys Co., Ltd.
    Inventor: Tao Shi Gao
  • Magnetic writing screen dispersion medium
    Publication number: 20020166991
    Abstract: A magnetic dispersion medium is used in a magnetic writing screen toy. The dispersion medium is attracted to the underside of the screen when a magnetic tipped pen is passed over the upper surface of the screen. A user can create drawings and figures. The dispersion medium is non-toxic, creates lines having good contrast and can be easily erased without permanently forming black marks on the screen. The dispersion medium works well in temperature ranges between −20° C. to 45° C.
    Type: Application
    Filed: August 24, 2001
    Publication date: November 14, 2002
    Inventor: Tao Shi Gao