Patents by Inventor Yajuan Ma

Yajuan Ma 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).

  • Smart doorbell
    Patent number: D1034270
    Type: Grant
    Filed: May 11, 2022
    Date of Patent: July 9, 2024
    Assignee: TianJin HuaLai Technology Co., Ltd.
    Inventors: Xiyin Xu, Jincan Lv, Yajuan Ma, Bo Li, Qing Zhang, Huaizhong Xie