ALEXANDRIA, Va., April 15 -- United States Patent no. 12,604,143, issued on April 14, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).
"Sound device" was invented by Xudong Yan (Changzhou, China), Tao Shao (Changzhou, China) and Xiaojiang Gu (Changzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A sound device includes a frame, a first vibration system, a second vibration system, and a magnetic circuit system. The first vibration system includes a first vibrating diaphragm and a first voice coil. The second vibration system includes a second vibrating diaphragm and a second voice coil. The first vibrating diaphragm includes a first vibrating portion, a first folding ring porti...