ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,749,639, issued on Sept. 29, was assigned to HongQiSheng Precision Electronics (QingHuangdao) Co. Ltd. (Hebei Province, China), Avary Holding (Shenzhen) Co. Ltd. (Shenzen, China) and Garuda Technology Co. Ltd. (New Taipei City, Taiwan).
"Relay circuit board" was invented by Feng-Mei Liu (Hebei Province, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A relay circuit board includes a first external circuit structure, a second external circuit structure, an internal circuit structure, a magnetic induction element, and a switch assembly. The internal circuit structure is disposed between the first external circuit structure and the second external ci...