US Patent Issued to Nippon Sheet Glass on May 27 for "Optical filter, optical device, and light-absorbing composition" (Japanese Inventors)

ALEXANDRIA, Va., June 17 -- United States Patent no. 12,313,869, issued on May 27, was assigned to Nippon Sheet Glass Co. Ltd. (Tokyo).

"Optical filter, optical device, and light-absorbing composition" was invented by Yuichiro Kubo (Tokyo) and Katsuhide Shimmo (Kanagawa, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical filter 1a has a first transmission spectrum satisfying the following requirements (i), (ii), (iii), and (iv) at 25deg C. (i) A minimum of a transmittance in a wavelength range of 450 nm to 600 nm is 70% or more. (ii) A maximum of the transmittance in a wavelength range of 300 nm to 370 nm is 5% or less. (iii) A maximum of the transmittance in a wavelength range of 800 nm to 1000...