Patents by Inventor Qingfeng Ling

Qingfeng Ling 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).

  • Four prongs stud earring
    Patent number: D997022
    Type: Grant
    Filed: September 21, 2022
    Date of Patent: August 29, 2023
    Assignee: PROJECTION HOUSE TECHNOLOGY CO., LIMITED
    Inventor: Qingfeng Ling