ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,429,827, issued on Sept. 30, was assigned to CITIZEN WATCH Co. LTD. (Tokyo).
"Mechanical timepiece" was invented by Yu Takyo (Nishitokyo, Japan), Yusaku Niida (Kawagoe, Japan), Takuya Shirai (Tokyo) and Yosuke Abe (Fuchu, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A mechanical timepiece includes: a hairspring; a permanent magnet; a soft magnetic core; a control circuit for performing rate adjustment based on a counter-electromotive voltage caused in a coil by a motion of the permanent magnet accompanying a forward direction motion and a reverse direction motion of the balance wheel. The permanent magnet is arranged so that, under a state in w...