US Patent Issued to TOKUYAMA on May 12 for "Photochromic cyclic compound and curable composition containing the photochromic cyclic compound" (Japanese Inventors)

ALEXANDRIA, Va., May 12 -- United States Patent no. 12,624,048, issued on May 12, was assigned to TOKUYAMA Corp. (Shunan, Japan).

"Photochromic cyclic compound and curable composition containing the photochromic cyclic compound" was invented by Masayuki Miyazaki (Shunan, Japan), Junji Takenaka (Shunan, Japan), Junji Momoda (Shunan, Japan), Srinivas Venu (Shunan, Japan) and Katsuhiro Mori (Shunan, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "The photochromic cyclic compound of the present invention is represented by Formula (1) below:in the formula, L is a divalent bridging group and PC is a divalent T-type photochromic basic structural group having a naphthopyran structure, where one end of the bridg...