Patents by Inventor Jia Jian Du

Jia Jian Du 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).

  • Set of combined brushes
    Patent number: D886461
    Type: Grant
    Filed: September 10, 2018
    Date of Patent: June 9, 2020
    Assignee: HAYCO MANUFACTURING LIMITED
    Inventor: Jia Jian Du
  • Interlocking brush set
    Patent number: D886462
    Type: Grant
    Filed: September 10, 2018
    Date of Patent: June 9, 2020
    Assignee: HAYCO MANUFACTURING LIMITED
    Inventor: Jia Jian Du