US Patent Issued to SANYO CHEMICAL INDUSTRIES, ENEOS on Feb. 17 for "Viscosity index improver, refrigerator oil, and working fluid composition for refrigerators" (Japanese Inventors)

ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,552,889, issued on Feb. 17, was assigned to SANYO CHEMICAL INDUSTRIES LTD. (Kyoto, Japan) and ENEOS Corp. (Tokyo).

"Viscosity index improver, refrigerator oil, and working fluid composition for refrigerators" was invented by Kazuki Ogata (Kyoto, Japan), Yoshimitsu Sugiyama (Kyoto, Japan), Naohiro Torii (Kyoto, Japan), Satoshi Goto (Tokyo), Yuya Mizutani (Tokyo), Hidetoshi Ogata (Tokyo), Yuma Seki (Tokyo) and Tatsuki Nakajima (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a viscosity index improver containing a copolymer (A) that contains, as essential constituent monomers, a fluorine atom-containing monomer (a) re...