US Patent Issued to IDEMITSU KOSAN on Jan. 27 for "Viscosity index enhancer composition, additive composition for lubricating oil, and lubricating oil composition" (Japanese Inventors)

ALEXANDRIA, Va., Jan. 28 -- United States Patent no. 12,534,682, issued on Jan. 27, was assigned to IDEMITSU KOSAN Co. LTD. (Tokyo).

"Viscosity index enhancer composition, additive composition for lubricating oil, and lubricating oil composition" was invented by Shota Kato (Chiyoda-ku, Japan) and Yukio Yoshida (Chiyoda-ku, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A viscosity index improver composition which has an excellent viscosity index improving effect. A viscosity index improver composition which includes a poly(meth)acrylate (A) including a constituent unit (Y) derived from a monomer (y) having a diol functional group, and a poly(meth)acrylate (B) including a constituent unit (Z) derived fr...