ALEXANDRIA, Va., June 19 -- United States Patent no. 12,335,703, issued on June 17, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).
"Multifunctional sounding device" was invented by Xin Jin (Changzhou, China), Fan Zhang (Changzhou, China), Wei Song (Changzhou, China) and Ronglin Linghu (Changzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure provides a multifunctional sounding device, which includes a lower housing, an upper housing and a sounding unit. The sounding unit includes a frame, a vibration system and a magnetic circuit system. The magnetic circuit system includes a main magnetic circuit, a first auxiliary magnetic circuit and a second auxiliary...