ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,449,578, issued on Oct. 21, was assigned to AGC INC. (Tokyo).
"Optical filter" was invented by Takashi Nagata (Shizuoka, Japan), Takahiro Sakagami (Shizuoka, Japan) and Kazuhiko Shiono (Fukushima, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical filter includes: a dielectric multilayer film 1; a substrate comprising a near-infrared ray absorbing glass and a resin film; and a dielectric multilayer film 2 in this order. The resin film comprises a near-infrared ray absorbing dye and a resin, the near-infrared ray absorbing glass is a fluorophosphate glass containing P, Cu, and F, and the optical filter satisfies all of the spectral character...