ALEXANDRIA, Va., Oct. 8 -- United States Patent no. 12,438,494, issued on Oct. 7, was assigned to Nanjing Chervon Industry Co. Ltd. (Nanjing, China).
"Power tool" was invented by Guang Li (Nanjing, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A power tool includes a motor, a switch, a driver circuit, an operating element, and a controller. The motor includes a multi-phase winding. The driver circuit has multiple power elements and is configured to change a rotational state of the motor. The operating element has a first operating state and a second operating state, where a strength of an effective magnetic field of the multi-phase winding when the operating element is in the first operating state is ...