ALEXANDRIA, Va., June 25 -- United States Patent no. 12,338,341, issued on June 24, was assigned to Nippon Sheet Glass Co. Ltd. (Tokyo).
"Infrared-cut filter" was invented by Yuichiro Kubo (Tokyo) and Katsuhide Shimmo (Kanagawa, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A composition for infrared-absorbing layers according to the present invention includes: a compound formed by copper ion and a phosphonic acid represented by the following formula (a); and at least one of a phosphoric acid diester represented by the following formula (b1) and a phosphoric acid monoester represented by the following formula (b2). In the composition, fine particles containing at least the compound are dispersed. A co...