Patents by Inventor Changfang Tong

Changfang Tong 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).

  • Sight
    Patent number: D919036
    Type: Grant
    Filed: September 22, 2020
    Date of Patent: May 11, 2021
    Inventor: Changfang Tong
  • Sight
    Patent number: D919037
    Type: Grant
    Filed: September 22, 2020
    Date of Patent: May 11, 2021
    Inventor: Changfang Tong