ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,771,978, issued on Oct. 20, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou City, China).
"Sound-producing unit" was invented by Chao Zhang (Changzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure provides a sound-producing unit having a flexible printed circuit board that includes a first fixing portion, a first elastic arm extending from the first fixing portion along a first direction, a second elastic arm extending from the first elastic arm along a second direction, and a second fixing portion connected to the second elastic arm. By providing two elastic arms extending in different directions, the first ...