US Patent Issued to Chevron U.S.A. on March 17 for "Method for producing high quality base oils using two stage hydrofinishing" (California Inventors)

ALEXANDRIA, Va., March 17 -- United States Patent no. 12,577,478, issued on March 17, was assigned to Chevron U.S.A. Inc. (San Ramon, Calif.).

"Method for producing high quality base oils using two stage hydrofinishing" was invented by Yihua Zhang (Albany, Calif.), Subhasis Bhattacharya (San Ramon, Calif.) and Guan-Dao Lei (Walnut Creek, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Described are processes to produce base oils with one more improved properties, e.g., lower aromatics, economically and/or efficiently. In some embodiments, the processes relate to two stage (or more) hydrofinishing which advantageously provides base oils with lower aromatics than comparable one stage processes."

The pat...