Patents by Inventor Cheung W. Keung

Cheung W. Keung 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: 5372511
    Abstract: An educational toy is disclosed which includes a sensor having an array of sensing points and a sensor sheet having a flexible face against which an object whose shape is to be recognized is placed, the object providing a change in electrical characteristics at points of the array which are contacted by the object, an output for detecting points whose electrical characteristics have been altered, a memory for comparing the relative positions of the points in such an array with information stored in memory to determine to which of the memorized set of objects the changed characteristics correspond and providing an output in a child recognizable manner associated with the shape placed on the sensor sheet.
    Type: Grant
    Filed: November 23, 1992
    Date of Patent: December 13, 1994
    Assignee: Tectron Manufacturing (HK) Limited
    Inventor: Cheung W. Keung
  • Patent number: D336316
    Type: Grant
    Filed: March 4, 1991
    Date of Patent: June 8, 1993
    Assignee: Wang Shing Plastic Factory Ltd.
    Inventors: Chan Pang, Cheung W. Keung
  • Patent number: D359526
    Type: Grant
    Filed: April 13, 1992
    Date of Patent: June 20, 1995
    Assignee: Tectron Manufacturing (HK) Limited
    Inventor: Cheung W. Keung