Patents by Inventor Ruibo Cai

Ruibo Cai 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).

  • Earphone
    Patent number: D935434
    Type: Grant
    Filed: March 2, 2021
    Date of Patent: November 9, 2021
    Inventor: Ruibo Cai
  • Earphone
    Patent number: D935435
    Type: Grant
    Filed: March 10, 2021
    Date of Patent: November 9, 2021
    Inventor: Ruibo Cai