Patents by Inventor David Wai Ming Sum

David Wai Ming 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).

  • Drying rack
    Patent number: D417536
    Type: Grant
    Filed: November 24, 1998
    Date of Patent: December 7, 1999
    Assignee: Forexim (H.K.) Limited
    Inventor: David Wai Ming Sum