Marine engine lubrication

Details Marine engine lubrication Marine engine lubrication

2009-05-18

2011-12-13

Griffin, Walter D (Department: 1774)

Solid anti-friction devices, materials therefor, lubricant or se

Lubricants or separants for moving solid surfaces and...

Organic -co- compound

C508S502000, C508S503000

Reexamination Certificate

active

08076276

ABSTRACT:
A trunk piston marine engine lubricating oil composition for a medium-speed compression-ignited marine engine comprises, in a major amount, an oil of lubricating viscosity containing 50 mass % or more of a Group II basestock, and, in respective minor amounts, (A) an overbased metal hydrocarbyl-substituted hydroxybenzoate detergent having a basicity index of 5.5 or greater, and (B) an overbased metal hydrocarbyl-substituted hydroxybenzoate detergent having a basicity index of 2 or less. The ratio of the mass of metal in detergent (A) to the mass of metal in detergent (B) is 10 or less.

REFERENCES:
patent: 2004/0121918 (2004-06-01), Rea et al.
patent: 2004/0138076 (2004-07-01), Muir et al.
patent: 2005/0119140 (2005-06-01), Chambard et al.
patent: 1889896 (2008-02-01), None
patent: 23590093 (2001-08-01), None
patent: 2005263861 (2005-09-01), None

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