ALEXANDRIA, Va., April 9 -- United States Patent no. 12,271,012, issued on April 8, was assigned to AGC Inc. (Tokyo).
"Glass for optical filter and optical filter" was invented by Takahiro Sakagami (Shizuoka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A glass for an optical filter, the glass being a phosphate glass including Cu, in which the glass has: an average transmittance of 80% or more at a wavelength of 430 nm to 550 nm; an average transmittance of 2% or less at a wavelength of 800 nm to 950 nm; an average transmittance of 3% or less at a wavelength of 1000 nm to 1200 nm; an average transmittance of 5% or less at a wavelength of 700 nm to 1200 nm; a transmittance of 25% or more at a waveleng...