Low ash lubricant compositions containing multiple overbased materials and multiple antioxidants
US6596672B1 · kind B1 · utility
26Cited by
2References
12Claims
0Family size
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Key dates
| Filing date | May 28, 2002 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | May 28, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/28
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A low sulfate ash lubricating oil composition comprising an oil of lubricating viscosity, 0.1 to 3.0% of a calcium overbased acidic material, 0.1 to 2.0% of a magnesium overbased acidic material, and at least 0.5% of a combination of an alkylene-coupled hindered phenol antioxidant and an antioxidant other than an alkylene-coupled hindered phenol antioxidant, is particularly useful for lubricating stationary gas engines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.