US Patent Issued to HOYA LENS THAILAND on March 17 for "Photochromic compound, photochromic composition, photochromic article and spectacles" (Japanese Inventors)

ALEXANDRIA, Va., March 17 -- United States Patent no. 12,577,455, issued on March 17, was assigned to HOYA LENS THAILAND LTD. (Pathumthani, Thailand).

"Photochromic compound, photochromic composition, photochromic article and spectacles" was invented by Hironori Kawakami (Tokyo), Aoi Matsue (Tokyo) and Kei Kobayashi (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is a photochromic compound represented by the following General Formula 1. In General Formula 1, Az represents a monovalent azine ring group which is unsubstituted or has a substituent, L represents a divalent or higher linking group, D represents a photochromic dye structure, a and c each independently represent an integer of 1 or mo...