Composition and method for reducing combustion chamber deposits, intake valve deposits or both in spark ignition internal combustion engines
US5752990A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1996 |
| Grant date | May 19, 1998 |
| Priority date | — |
| Expiry date | Mar 29, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10L1/2475
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Combustion chamber deposits and intake valve deposits in a spark ignition internal combustion engine which uses a liquid hydrocarbon or liquid hydrocarbon-oxygenate fuel, by using an unleaded fuel to which has been added an additive selected from the group consisting of low boiling alkyl pyridines, 4-vinylpyridine, DMF, N-formylpiperidine, sulfolane, polyolefin, polyether or polyether amine derivatives of DMF, amidene, or N-substituted-2 pyrrolidones, polyolefin in an amount of at least about 1,000 wppm and mixtures thereof. Functionalized polymer detergents can be used alone and added to the fuels in amounts in of about at least 3,000 wppm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.