ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,772,007, issued on Oct. 20, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou City, China).
"Speaker" was invented by Zhizhu Chen (Changzhou, China) and Zhaoyu Yin (Changzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A speaker includes a frame, a vibration system, and a magnetic circuit system. The magnetic circuit system includes a lower plate, a main magnetic component, a secondary magnetic component, and an upper plate. The upper plate includes a main body, the main body includes two long axis sides and two short axis sides, the two long axis sides are opposite to each other, the two short axis sides are opposite to each other...