Patents by Inventor Chor Keung Chang

Chor Keung Chang 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).

  • Tool for coring and cutting
    Patent number: D386651
    Type: Grant
    Filed: August 13, 1996
    Date of Patent: November 25, 1997
    Inventor: Chor Keung Chang
  • Tool for coring and cutting food
    Patent number: D394372
    Type: Grant
    Filed: February 7, 1997
    Date of Patent: May 19, 1998
    Inventor: Chor Keung Chang