Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Inorganic compound
Reexamination Certificate
2011-04-05
2011-04-05
Caldarola, Glenn A (Department: 1771)
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Inorganic compound
C508S156000, C508S433000, C508S441000, C508S442000, C508S569000
Reexamination Certificate
active
07919440
ABSTRACT:
A lubricating composition with improved storage stability comprising a major amount of an oil of lubricating viscosity, at least one alkali metal borate, at least one polysulfide mixture having at least 40% dihydrocarbyl tetrasulfide or higher sulfides, and at least one non-acidic phosphorus compound comprised of a trihydrocarbyl phosphate and a dihydrocarbyl dithiophosphate derivative is disclosed. In addition to improved storage stability, the composition has improved wear performance when the ratio of polysulfides is controlled.
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Haire Michael J.
Zakarian John A.
Caldarola Glenn A
Chevron U.S.A. Inc.
Prater Penny L.
Roth Steven
Vasisth Vishal
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