ALEXANDRIA, Va., Aug. 26 -- United States Patent no. 12,401,939, issued on Aug. 26, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).
"Coaxial speaker box" was invented by Zhang Ren (Shenzhen, China), Zhiwei Zhong (Shenzhen, China) and Qi Wang (Shenzhen, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A coaxial speaker box includes a housing, a speaker, and a sound guide channel for guiding sound outside. The speaker includes a frame, a magnetic circuit system, a first vibration system, and a second vibration system. The first vibration system is disposed in the frame. The second vibration system is disposed on an outer side of the frame. A front cavity is formed among the first vib...