ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,452,597, issued on Oct. 21, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).
"Coaxial speaker" was invented by Zhang Ren (Shenzhen, China), Qi Wang (Shenzhen, China) and Zhiwei Zhong (Shenzhen, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A coaxial speaker includes a magnetic circuit system, a first sound production unit, and a second sound production unit. The first sound production unit and the second sound production unit are coaxially disposed. The first sound production unit surrounds the second sound production unit. The first sound production unit includes a first vibrating diaphragm and a first voice coil. The first...