Patents by Inventor Qiujian Liu

Qiujian Liu 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).

  • Door knob
    Patent number: D1042083
    Type: Grant
    Filed: April 14, 2023
    Date of Patent: September 17, 2024
    Assignee: SHENZHEN HUANKE ENTERPRISE MNGT
    Inventor: Qiujian Liu
  • Tracker
    Patent number: D1044539
    Type: Grant
    Filed: August 7, 2023
    Date of Patent: October 1, 2024
    Assignee: Shenzhen Huanke Enterprise Management
    Inventor: Qiujian Liu
  • Humidifier
    Patent number: D1045047
    Type: Grant
    Filed: April 14, 2023
    Date of Patent: October 1, 2024
    Inventor: Qiujian Liu