ALEXANDRIA, Va., June 9 -- United States Patent no. 12,287,501, issued on April 29, was assigned to Nippon Sheet Glass Co. Ltd. (Tokyo).
"Light-absorbing composition, light-absorbing film, and optical filter" was invented by Yuichiro Kubo (Tokyo), Katsuhide Shimmo (Kanagawa, Japan), Lei Cai (Kanagawa, Japan) and Hitomi Masuda (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "The light-absorbing composition according to the present invention includes: a light absorber made of a phosphonic acid represented by the following formula (A) and copper ion; and a curable resin. Alight-absorbing film having desired properties can be provided by curing a coating film of the light-absorbing composition. In the formu...