US Patent Issued to Idemitsu Kosan on Feb. 11 for "Method for using lubricating oil composition and method for evaluating degradation" (Japanese Inventors)

ALEXANDRIA, Va., Feb. 12 -- United States Patent no. 12,222,344, issued on Feb. 11, was assigned to Idemitsu Kosan Co. Ltd. (Chiyoda-ku, Japan).

"Method for using lubricating oil composition and method for evaluating degradation" was invented by Moritsugu Kasai (Tokyo) and Tatsuya Kusumoto (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for utilizing a lubricating oil composition in which the content of a metal-based cleaning agent (X) having a base value of 100 mgKOH/g or less is 630 mass ppm or less in terms of metal atoms, and the content of sulfated ash is 1.5 mass % or less. The method includes measuring at least one physical property value among the capacitance and the dielectric constan...