Patent · US Active

Marine engine lubrication

US9534185B2 · kind B2 · utility

0Cited by

1References

7Claims

0Family size

Assignee

Infineum International Limited · GB

Inventors

James C. Dodd · Biggenden, AU
Louise Renouf · East Hagbourne, GB

Key dates

Filing date	Mar 28, 2013
Grant date	Jan 3, 2017
Priority date	—
Expiry date	Mar 28, 2033

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC10N2030/78
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Trunk piston marine engine lubrication, when the engine is fueled by heavy fuel oil, is effected by a composition of TBN in the range of 20 to 60 comprising a major amount of an oil of lubricating viscosity containing 50 mass % or more of a Group 1 basestock, and respective minor amounts of a calcium alkyl salicylate detergent system providing 40 to 90 mmol of calcium alkyl salicylate per kg of the composition, and 1 to 7 mass %, based on the mass of the composition, of an oil-soluble polyalkenyl-substituted carboxylic acid anhydride, wherein the or at least one polyalkenyl group is derived from a polyalkene having a number average molecular weight of from 200 to 3,000. Asphaltene precipitation in the lubricant, caused by the presence of contaminant heavy fuel oil, is prevented or inhibited.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.