ALEXANDRIA, Va., Sept. 10 -- United States Patent no. 12,413,910, issued on Sept. 9, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).
"Speaker device" was invented by Zhang Ren (Changzhou, China), Zhiwei Zhong (Changzhou, China) and Qiaoling Li (Changzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present application provides a speaker device including a casing and a sounding driver. The casing has an accommodating space and a sound-conducting channel, and the sounding driver is accommodated in the accommodating space. The sounding driver comprises a first frame, a first vibration system, a magnetic circuit system, a second frame, a second vibration system, and a conducti...