ALEXANDRIA, Va., Sept. 3 -- United States Patent no. 12,402,718, issued on Sept. 2, was assigned to SHANGHAI SHIFT ELECTRONICS Co. LTD. (Shanghai).
"Toothbrush" was invented by Zhenwu Xu (Shanghai) and Xiaoguo Dai (Shanghai).
According to the abstract* released by the U.S. Patent & Trademark Office: "A toothbrush includes a brush head linkage (100), a connecting mechanism (200) and a toothbrush handle (300); the connecting mechanism (200) includes a first connector (210), a second connector (220) and an elastic structural element (230) connected to the second connector (220); the first connector (100) is rotatably connected to the second connector (220), and the axis of rotation extends in a front-rear direction; and the elastic structura...