ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,477,268, issued on Nov. 18, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).
"Speaker device" was invented by Zhang Ren (Changzhou, China), Zhiwei Zhong (Changzhou, China) and Wei Song (Changzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present application provides a speaker device, including: a magnetic circuit system including a lower splint; a first main magnetic steel provided with two second through-holes; a sub-magnetic steel spaced apart from the first main magnetic steel to form a first magnetic gap; a pole core, including a pole core body, a pole core wall, a pole core plate and two third through-holes thr...