US Patent Issued to TOKUYAMA on April 7 for "Photochromic compound, naphthol derivative, curable composition, optical article, lens, and eyeglasses" (Japanese Inventors)

ALEXANDRIA, Va., April 7 -- United States Patent no. 12,595,408, issued on April 7, was assigned to TOKUYAMA Corp. (Yamaguchi, Japan).

"Photochromic compound, naphthol derivative, curable composition, optical article, lens, and eyeglasses" was invented by Masayuki Miyazaki (Yamaguchi, Japan), Srinivas Venu (Yamaguchi, Japan) and Katsuhiro Mori (Yamaguchi, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "The purpose of the present invention is to provide: a photochromic compound having an excellent color fading rate and excellent durability; a naphthol derivative that can become an intermediate for the photochromic compound; and a curable composition, an optical article, a lens and eyeglasses each contain...