ALEXANDRIA, Va., Sept. 3 -- United States Patent no. 12,407,988, issued on Sept. 2, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).
"Speaker" was invented by Zhaoyu Yin (Changzhou, China), Ke Li (Changzhou, China), Wei Wei (Changzhou, China) and Zhizhu Chen (Changzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure discloses a speaker comprising a frame, a vibration system, a magnetic circuit system, and a flexible circuit board; the magnetic circuit system comprising a lower clamping plate and a main magnet; the lower clamping plate comprising a lower clamping body, four rectangular through-holes and four first flanges; a portion of the lower clamping body...