ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,483,823, issued on Nov. 25, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).
"Sound-generating device" was invented by Zhang Ren (Changzhou, China) and Zhiwei Zhong (Changzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A sound-generating device, including a bass cone frame, a bass vibration system, a bass magnetic circuit system, a treble cone frame, a treble vibration system, a treble magnetic circuit system and a conductive component. The treble vibration system includes a treble diaphragm and a treble voice coil. The bass magnetic circuit system includes a bass bottom plate and a first bass primary magnet. The treble ...