US Patent Issued to Central Glass on July 8 for "Polyamide acid, polyimide, optical film, display device and production methods thereof" (Japanese Inventors)

ALEXANDRIA, Va., July 9 -- United States Patent no. 12,351,685, issued on July 8, was assigned to Central Glass Co. Ltd. (Ube, Japan).

"Polyamide acid, polyimide, optical film, display device and production methods thereof" was invented by Hiroshi Eguchi (Kawagoe, Japan), Ayumi Yamaguchi (Kawagoe, Japan), Yukari Hara (Kawagoe, Japan), Kei Matsunaga (Kawagoe, Japan), Hiroto Hori (Kawagoe, Japan), Yosuke Murakami (Kawagoe, Japan), Kensuke Hirotaki (Kawagoe, Japan) and Kenji Hosoi (Kawagoe, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A polyimide which is obtained by a reaction of an aromatic diamine having a 1,1,1-trifluoro-2,2-ethanediyl group (-C(CF3)H-), as a linkage skeleton, with a tetracarboxylic...