Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic compound containing boron
Reexamination Certificate
2005-12-21
2009-06-16
Griffin, Walter D (Department: 1797)
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic compound containing boron
C208S018000, C208S019000
Reexamination Certificate
active
07547666
ABSTRACT:
An ashless hydraulic fluid or paper machine oil 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. An ashless hydraulic fluid or paper machine 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 ashless antioxidant additive concentrate, and c) low amount of VI improver. A process for making an ashless hydraulic fluid or paper machine oil comprising a) hydroisomerization dewaxing, b) fractionating, c) selecting a fraction having a very high VI, and a high level of molecules with cycloparaffinic functionality or a low traction coefficient, and d) blending the fraction with an ashless antioxidant. Also, a method of improving the oxidation stability of an ashless hydraulic fluid or paper machine 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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