ALEXANDRIA, Va., July 28 -- United States Patent no. 12,692,456, issued on July 28, was assigned to IDEMITSU KOSAN Co. LTD. (Chiyoda-ku, Japan).
"Lubricant composition" was invented by Kazushige Matsubara (Chiba, Japan) and Hiroyuki Tatsumi (Chiba, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A lubricating oil composition containing a phosphite ester derivative (A) having at least one alkyl group having 1 to 20 carbon atoms in which one -CH2- group is substituted with a -S- group, and a thiadiazole derivative (B). A method of lubricating an electric drive unit with the lubricating oil composition and an electric drive unit including the lubricating oil composition."
The patent was filed on March 25,...