Lubricating oil composition for internal combustion engine
US7648947B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 27, 2003 |
| Grant date | Jan 19, 2010 |
| Priority date | — |
| Expiry date | Jul 9, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/25
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides a lubricating oil composition for an internal combustion engine which is very good in base number retention property, detergency at high temperature and valve train anti-wear property and does not substantially contain phosphorus- and/or sulfur-containing anti-wear agent. The composition comprises a lubricant base oil comprising a mineral oil and/or a synthetic oil, (A) 0.001 to 0.5% by mass of an ester of a boric acid in terms of boron element therein and (B) 0.01 to 5% by mass of an ashless antioxidant, wherein said composition contains substantially no metal salts of dithiophosphoric acid and has a sulfur content of 0.2% by mass or less, each percentage being based on a total mass of the composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.