ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,545,850, issued on Feb. 10, was assigned to IDEMITSU KOSAN Co. LTD. (Tokyo).
"Lubricating oil composition" was invented by Daisuke Nakaue (Tokyo) and Masaya Kubota (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A lubricating oil composition may have excellent fuel economy and high shear stability. Such a lubricating oil composition may include: a comb-like polymer (A1) having a weight average molecular weight (Mw) of less than 300,000; and a comb-like polymer (A2) having a Mw of at least 400,000. The (A1)/(A2) mass content ratio of the comb-like polymer (A1) to the comb-like polymer (A2) in terms of resin content may be at least 0.25."
The paten...