ALEXANDRIA, Va., March 19 -- United States Patent no. 12,253,090, issued on March 18, was assigned to BEIJING ROBOROCK TECHNOLOGY Co. LTD. (Beijing).
"Fan and cleaning device" was invented by Yuanjian Liang (Beijing), Changcheng Li (Beijing) and Zhimin Yang (Beijing).
According to the abstract* released by the U.S. Patent & Trademark Office: "A fan includes a rotor; a stator; a first bearing assembly disposed at a radial outer side of an end of the rotor; and an impeller including an impeller body, where the impeller body is provided with a receiving cavity for receiving the first bearing assembly; and one end of the first bearing assembly is disposed in the receiving cavity, and the rotor, the first bearing assembly and the impeller body...