ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,544,299, issued on Feb. 10, was assigned to Ruiduo (Shanghai) Intelligent Technology Co. Ltd. (Shanghai).
"Massage chair" was invented by Bing Zhao (Shanghai), Haitang Lai (Shanghai), Cheng Fan (Shanghai) and Fawen Luo (Shanghai).
According to the abstract* released by the U.S. Patent & Trademark Office: "A massage chair relates to the technical field of passive exercise equipment. It includes a seat and a driving device arranged under the seat. The driving device includes a base plate, a connecting frame, an up-and-down vibration device and a four-bar linkage device. A connecting rod is fixed on the bottom of the seat, and the connecting rod is hinged with the connecting frame. The ...