US Patent Issued to Nippon Kayaku on May 27 for "Anthraquinone compound, liquid crystal composition containing said compound, and dimming element" (Japanese Inventors)

ALEXANDRIA, Va., June 17 -- United States Patent no. 12,312,294, issued on May 27, was assigned to Nippon Kayaku K.K. (Tokyo).

"Anthraquinone compound, liquid crystal composition containing said compound, and dimming element" was invented by Kohei Ohtani (Tokyo), Hitomi Muto (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): (where R1 and R4 represent -H, a C1-C12 alkyl group, a C1-C12 alkyl group, a halogen atom, -CO2R9, -OCOR9, -COR9, a cyano group, or -CF3, R2, R3, R5 and R6 represent -H, a C1-C4 alkyl group, a C1-C4 alkoxy group, a halogen atom, -CO2R9, -OCOR9, -COR9, a cyano group, or -CF3. R7 and R8 re...