ALEXANDRIA, Va., Sept. 3 -- United States Patent no. 12,407,978, issued on Sept. 2, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).
"Speaker box" was invented by Haijuan Yang (Changzhou, China) and Shuwen Wu (Changzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure discloses a speaker box including a metal cover fixed between the frame and the magnetic circuit system; the metal cover includes a bottom wall set at a bottom of the speaker unit and a side wall extending from the bottom wall and set at a side of the speaker unit; the vibration system, the frame, the metal cover and the magnetic circuit system enclosing a internal space of the speaker unit; the...