Mineral oils: processes and products – Products and compositions – Lubricating oils
Reexamination Certificate
2005-03-11
2008-10-14
Griffin, Walter D. (Department: 1797)
Mineral oils: processes and products
Products and compositions
Lubricating oils
C508S126000
Reexamination Certificate
active
07435327
ABSTRACT:
This invention provides a hydraulic oil comprising: 1) a lubricant base oil having an average molecular weight greater than 475, a viscosity index greater than 140, and a weight percent olefins less than 10; and 2) an antiwear hydraulic oil additive package. The hydraulic oil of this invention has an air release by ASTM D 3427-03 of less than 0.8 minutes at 50 degrees C., and a sequence II foam tendency by ASTM D 892-03 of less than 50 ml. We describe a process for making the hydraulic oil of this invention, and a method of operating a hydraulic pump without pump cavitation using the hydraulic oil of this invention.
REFERENCES:
patent: 6090758 (2000-07-01), Pillon et al.
patent: 6103099 (2000-08-01), Wittenbrink et al.
patent: WO00/14183 (2000-03-01), None
Abernathy Susan M.
Bertrand Nancy J.
Miller Stephen J.
Rosenbaum John M.
Abernathy Susan M.
Campanell Frank C
Chevron U.S.A. Inc.
Griffin Walter D.
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