Automatic transmission fluids and additives therefor
US5387346A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1993 |
| Grant date | Feb 7, 1995 |
| Priority date | — |
| Expiry date | Jul 19, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2070/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A lubricant composition especially adapted for use as an automatic transmission fluid, which composition consists essentially of: a) from 50 to 85 weight percent of a mineral oil having a viscosity at 100.degree. C. in the range of 3 to 5 centistokes; b) from 5 to 35 weight percent of a poly-.alpha.-olefin lubricating oil having a viscosity at 100.degree. C. in the range of 1 to 8 centistokes; and c) from 8 to 15 weight percent of a combination of alkenyl succinimide dispersant, viscosity index improver and antioxidant; said composition being further characterized in that it contains less than 7.0 weight percent of viscosity index improver and in that the composition has a Brookfield viscosity at -40.degree. C. of no more than 20,000 cP.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.