ALEXANDRIA, Va., Sept. 10 -- United States Patent no. 12,414,233, issued on Sept. 9, was assigned to LG INNOTEK Co. LTD. (Seoul, South Korea).
"Circuit board" was invented by Dong Hwa Lee (Seoul, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "A circuit board according to the embodiment includes a first substrate including a first insulating layer and a first pad disposed on an upper surface of the first insulating layer; a second substrate including a second insulating layer including a via hole and a metal layer formed on upper and lower surfaces of the second insulating layer and an inner wall of the via hole; a third insulating layer disposed between the first substrate and the second substrat...