Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic compound containing boron
Reexamination Certificate
2008-08-06
2009-08-04
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
07569524
ABSTRACT:
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, and d) blending the fraction with an ashless antioxidant. A process for making ashless paper machine oil, comprising:a. selecting two lubricating base oils both having a consecutive number of carbon atoms, greater than 35 wt % total molecules with cycloparaffinic functionality, and a viscosity index greater than 150;b. blending the two lubricating base oils with an ashless antioxidant additive concentrate and no viscosity index improver to make an ashless paper machine oil; wherein the ashless paper machine oil has a result of greater than 680 minutes in the rotary pressure vessel oxidation test.
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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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