Patents by Inventor Kei Tun Sang

Kei Tun Sang 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).

  • Switch
    Patent number: D511504
    Type: Grant
    Filed: January 18, 2005
    Date of Patent: November 15, 2005
    Assignee: Merchant Corporation Limited
    Inventor: Kei Tun Sang