ALEXANDRIA, Va., June 9 -- United States Patent no. 12,289,573, issued on April 29, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).
"Speaker box" was invented by Yi Chen (Shenzhen, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention provides a speaker box including a housing and a speaker unit accommodated in the housing. The speaker box also includes an air-permeable spacer accommodated in the housing. The housing includes a bottom wall away from the speaker unit and a side wall bent and extended from the bottom wall toward the speaker unit. The air-permeable spacer is enclosed with the bottom wall and the side wall to form a containment space filled with sound ...