Patents by Inventor Frederick Lam-Tak Tsang

Frederick Lam-Tak 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).

  • Electronic educational activity toy
    Patent number: D358421
    Type: Grant
    Filed: November 10, 1993
    Date of Patent: May 16, 1995
    Assignee: Vtech Industries, Inc.
    Inventors: Chi Ka-Wah Chow, Frederick Lam-Tak Tsang
  • Electronic learning aid housing
    Patent number: D422033
    Type: Grant
    Filed: February 16, 1999
    Date of Patent: March 28, 2000
    Assignee: Vtech Electronics Limited
    Inventors: Maisy Min-Shih Wai, Frederick Lam-Tak Tsang