Patents by Inventor Chi H. D. Chan

Chi H. D. Chan 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).

  • Pocket calculator
    Patent number: D306456
    Type: Grant
    Filed: July 27, 1987
    Date of Patent: March 6, 1990
    Assignee: Dah Sun Electronics Company Limited
    Inventor: Chi H. D. Chan
  • Digital display timepiece
    Patent number: D313354
    Type: Grant
    Filed: July 27, 1987
    Date of Patent: January 1, 1991
    Assignee: Dah Sun Electronics Company Limited
    Inventor: Chi H. D. Chan