ALEXANDRIA, Va., Aug. 26 -- United States Patent no. 12,398,331, issued on Aug. 26, was assigned to Chevron U.S.A. Inc. (San Ramon, Calif.).
"Catalyst and process using SSZ-91 and ZSM-12" was invented by Yihua Zhang (Albany, Calif.), Adeola Florence Ojo (Pleasant Hill, Calif.) and Guan-Dao Lei (Walnut Creek, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An improved hydroisomerization catalyst and process for making a base oil product using a catalyst comprising SSZ-91 molecular sieve and ZSM-12 molecular sieve. The catalyst and process generally involves the use of a catalyst comprising an SSZ-91 molecular sieve combined with a ZSM-12 molecular sieve to produce dewaxed base oil products by contacting...