Patents by Inventor David Sum

David Sum 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).

  • Bottle stopper
    Patent number: D451337
    Type: Grant
    Filed: January 24, 2001
    Date of Patent: December 4, 2001
    Assignee: Forexim (H.K.) Limited
    Inventor: David Sum
  • Can opener
    Patent number: D454472
    Type: Grant
    Filed: January 24, 2001
    Date of Patent: March 19, 2002
    Assignee: Forexim (HK) Limited
    Inventor: David Sum
  • Corkscrew
    Patent number: D454473
    Type: Grant
    Filed: January 24, 2001
    Date of Patent: March 19, 2002
    Assignee: Forexim (HK) Limited
    Inventor: David Sum