ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,554,051, issued on Feb. 17, was assigned to AGC Inc. (Tokyo).
"Optical filter" was invented by Yuichiro Orita (Fukushima, Japan), Kazuhiko Shiono (Fukushima, Japan), Motoshi Nakayama (Fukushima, Japan) and Takuro Shimada (Fukushima, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical filter includes: a transparent substrate; and an absorption layer on the transparent substrate, the absorption layer containing at least one dye (X) having a maximum absorption wavelength in 600 to 1000 nm. A laminate of the transparent substrate and the absorption layer satisfies all of the following characteristics (i-2) to (i-4): (i-2) a maximum internal tran...