ALEXANDRIA, Va., March 24 -- United States Patent no. 12,587,792, issued on March 24, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).
"Sound device" was invented by Zhongfeng Gao (Changzhou, China), Jingwei Yu (Changzhou, China), Siyuan Ni (Changzhou, China) and Qibo Li (Changzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure discloses a sound device including a frame, a magnet system, and a vibration system; the vibration system includes a diaphragm and a coil fixed to the diaphragm; the diaphragm includes a rectangular dome and an edge surrounding the dome; the dome includes a first protrusion, a second protrusion and a third protrusion recessed towards...