ALEXANDRIA, Va., June 16 -- United States Patent no. 12,659,638, issued on June 16, was assigned to AAG Microtech (Changzhou) Co. Ld. (Changzhou, China).
"Speaker box" was invented by Chao Zhang (Changzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention provides a speaker box including a housing having a receiving room and a speaker received in the receiving room. The speaker includes a frame, a diaphragm and a magnetic circuit system supported on the frame. The speaker separates the receiving room into a front cavity for transmitting a sound and a rear cavity. The speaker has a back cavity, and the back cavity is communicated with the rear cavity. The housing includes an outer su...