ALEXANDRIA, Va., July 9 -- United States Patent no. 12,356,171, issued on July 8, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).
"Sounding device" was invented by Long Zhang (Changzhou, China), Xiwen Du (Changzhou, China) and Xianjie Dong (Changzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention provides a sounding device having a frame, a vibration system, a magnetic circuit system, a front cover, a waterproof sealing ring and a waterproof and breathable spacer. The front cover includes a front cover body, a first through hole and a second through hole running through the front cover body, and a support wall of the front cover body. The waterproof and bre...