ALEXANDRIA, Va., June 19 -- United States Patent no. 12,335,705, issued on June 17, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).

"Speaker" was invented by Dijiang Tong (Shenzhen, China), Huanbin Liao (Shenzhen, China) and Yajian Zheng (Shenzhen, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A speaker includes: a frame, a vibration system fixed to the frame, including a diaphragm fixed to the frame and a voice coil driving the diaphragm to vibrate and emit sounds, and a magnetic circuit system fixed to the frame, wherein the diaphragm includes a dome and a suspension surrounding and connected with the dome, the dome includes a first metal dome with a through hole and a second ...