ALEXANDRIA, Va., Dec. 9 -- United States Patent no. 12,492,340, issued on Dec. 9, was assigned to Samsung Display Co. Ltd. (Yongin-si, South Korea) and DONGWOO FINE-CHEM Co. Ltd. (Iksan-si, South Korea).
"Etchant" was invented by Shinhyuk Yang (Yongin-si, South Korea), Beomsoo Kim (Iksan-si, South Korea), Hyeonsu Cho (Iksan-si, South Korea), Jeehoon Kim (Yongin-si, South Korea), Youngjin Yoon (Iksan-si, South Korea), Eunwon Lee (Iksan-si, South Korea), Donghan Kang (Yongin-si, South Korea), Jihun Park (Yongin-si, South Korea) and Jongmoo Huh (Yongin-si, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "An etchant including: persulfate; a fluorine-containing compound; a chlorine-containing compound; ...