US4437436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antiknock additive compositions and unleaded gasoline containing same
Assignee: Shell USA Inc
•
Filing: 1982-10-04
•
Granted: 1984-03-20
•
Expires: 2002-10-04
Abstract
Abstract A method of operating a spark ignition internal combustion engine with unleaded gasoline is disclosed wherein methylcyclopentadienyl manganese tricarbonyl (MMT) is used as a primary antiknock compound and from about 5 to about 60 moles of benzoylacetone or methyl benzoylacetone per mole of manganese is used as a co-antiknock compound. These co-antiknock compounds are particularly suitable because they do not react with wet rusted steel in gasoline distribution systems, nor with terneplate surface coatings in automobile fuel storage tanks.
Inventors
- 👤 L. B. Graiff
- 👤 John L. Laity
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:41
CPC Classifications
F; F02; F02B; F02B47/00; F02B47/04; F02B1/00; F02B1/02; F02B1/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
An improved method of operating a spark ignition internal combustion engine which comprises burning in said engine an unleaded gasoline which has been transported to the engine through a gasoline distribution system which includes rusted steel lines and/or has been stored in an automobile fuel tank which includes a terneplate internal surface coating, said unleaded gasoline containing as a primary antiknock compound from about 0.005 to about 0.1 gram manganese per gallon as methylcyclopentadienyl manganese tricarbonyl (MMT) and containing as a co-antiknock compound which is unreactive with rusted steel or terneplate from 5 to about 60 moles of benzoylacetone or methyl benzoylacetone per mole of manganese and optionally a suitable corrosion inhibitor.
Claim 2
Dependent Claim
112 words
An improved method of operating a spark ignition internal combustion engine which comprises burning in said engine an unleaded gasoline which has been transported to the engine through a gasoline distribution system which includes rusted steel lines and/or has been stored in an automobile fuel tank which includes a terneplate internal surface coating, said unleaded gasoline containing as a primary antiknock compound from about 0.005 to about 0.1 gram manganese per gallon as methylcyclopentadienyl manganese tricarbonyl (MMT) and containing as a co-antiknock compound which is unreactive with rusted steel or terneplate from 5 to about 60 moles of benzoylacetone or methyl benzoylacetone per mole of manganese and optionally a suitable corrosion inhibitor.
Claim 3
Dependent Claim
15 words
The method of claim 1, wherein the corrosion inhibitor is dicyclohexyl ammonium nitrite or diisopropanolamine.
Claim 4
Dependent Claim
25 words
The method of claim 1, wherein the gasoline contains from about 10 to about 30 moles of benzoylacetone or methyl benzoylacetone per mole of manganese.
Claim 5
Dependent Claim
27 words
The method of claim 1, wherein the co-antiknock compound is benzoylacetone and the gasoline contains from 10 to 200 ppm by weight dicyclohexyl ammonium nitrite or diisopropanolamine.
Claim 6
Dependent Claim
12 words
The method of claim 1, wherein the co-antiknock compound is p-methyl benzoylacetone.
References Cited (Backward Citations)
CA707695A
Cited
US2449962A
Cited
US2643176A
Cited
US2868816A
Cited
US2960514A
Cited
US4031864A
Cited
US4214615A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |