Patents by Inventor Tong Yiu Lun

Tong Yiu Lun 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).

  • Calculator housing
    Patent number: D408442
    Type: Grant
    Filed: July 31, 1998
    Date of Patent: April 20, 1999
    Assignee: Cedar Base Electronic Limited
    Inventor: Tong Yiu Lun