US Patent Issued to Nippon Kayaku on June 17 for "Anthraquinone compound, liquid crystal composition containing said compound, and light-controlling element" (Japanese Inventors)

ALEXANDRIA, Va., June 19 -- United States Patent no. 12,331,240, issued on June 17, was assigned to Nippon Kayaku K.K. (Tokyo).

"Anthraquinone compound, liquid crystal composition containing said compound, and light-controlling element" was invented by Hitomi Muto (Tokyo), Kohei Ohtani (Tokyo), Yu Hattori (Tokyo) and Saori Suzuki (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "An anthraquinone compound represented by formula (1) (In the formula, R1 and R4 represent a hydrogen atom, a C1-12 alkyl group, a C1-12 alkoxy group, a halogen atom, -CO2R9, -OCOR9, -COR9, a cyano group, or a trifluoromethyl group. R2, R3, R5, and R6 represent a hydrogen atom, a C1-4 alkyl group, a C1-4 alkoxy group, a halogen at...