ALEXANDRIA, Va., July 16 -- United States Patent no. 12,363,483, issued on July 15, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).
"Speaker" was invented by Xiwen Du (Changzhou, China), Long Zhang (Changzhou, China) and Yu Qi (Changzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention provides a speaker including a first frame, a second frame forming a receiving room with the first frame, a first vibration system, a second vibration system, and a magnetic circuit system. The first vibration system includes a first diaphragm and a first voice coil. The second vibration system includes a second diaphragm and a second voice coil. Winding planes of the first voi...