Patents by Inventor Changqin Ji

Changqin Ji 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).

  • Pet hair clipper
    Patent number: D936901
    Type: Grant
    Filed: April 8, 2020
    Date of Patent: November 23, 2021
    Assignee: Qinglao Kaipu Dun International Trade Co., Ltd.
    Inventor: Changqin Ji
  • Pet water fountain
    Patent number: D972228
    Type: Grant
    Filed: October 26, 2021
    Date of Patent: December 6, 2022
    Inventor: Changqin Ji
  • Pet clipper
    Patent number: D977752
    Type: Grant
    Filed: June 22, 2021
    Date of Patent: February 7, 2023
    Assignee: Qingdao Kaipu Dun International Trade Co., Ltd
    Inventor: Changqin Ji