Mineral oils: processes and products – Products and compositions – Lubricating oils
Reexamination Certificate
2005-12-21
2010-02-16
Griffin, Walter D (Department: 1797)
Mineral oils: processes and products
Products and compositions
Lubricating oils
C208S019000, C508S460000
Reexamination Certificate
active
07662271
ABSTRACT:
A lubricating oil (made from Group III base oil having a sequential number of carbon atoms) having a VI between 155 and 300, a RPVOT greater than 680 minutes, and a kinematic viscosity at 40° C. from 19.8 cSt to 748 cSt. A lubricating oil having a high VI and high RPVOT comprising: a) a Group III base oil with a sequential number of carbon atoms, and defined cycloparaffin composition or low traction coefficient, b) an antioxidant additive concentrate and c) no VI improver. A process comprising: a) hydroisomerization dewaxing of a waxy feed, b) fractionating the produced base oil, c) selecting a fraction having a VI greater than 150, and a high level of molecules with cycloparaffinic functionality or a low traction coefficient, and d) blending the fraction with an antioxidant additive concentrate. Also, a method of improving the oxidation stability of a lubricating oil.
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U.S. Appl. No. 11/296,636, “Manual transmission fluid made with lubricating base oil having high monocycloparaffins and low multicycloparaffins,” Rosenbaum, Filed: Dec. 7, 2005, 31 pages.
Bertrand Nancy J.
Frazier Rawls
LeMay Patricia
Loh William
Okazaki Mark E.
Abernathy Susan M.
Campanell Frank C
Chevron U.S.A. Inc.
Griffin Walter D
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