US3898055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gasoline engine fuel
Assignee: Bray Oil Co
•
Filing: 1971-06-07
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Granted: 1975-08-05
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Expires: 1991-06-07
Abstract
Abstract Recession of exhaust valves in gasoline engines operating on lead-free fuel resulting from erosion of the cast iron seats is inhibited by adding to the fuel an overbased, oil soluble sulfonate of a Group II metal, thereby forming on the valve seats a protective deposit of Group II metal compound.
Inventors
- 👤 Ulric B Bray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:12
CPC Classifications
C; C10; C10L; C10L10/00; C10L10/08; C10L1/00; C10L1/10; C10L1/14; C10L1/24; C10L1/2431; C10L1/2437
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
84 words
THE METHOD OF PREVENTING EROSION OF CAST IRON EXHAUST VALVE SEATS IN AN INTERNAL COMBUSTION ENGINE OPERATING ON LEAD-FREE GASOLINE FUEL WHICH COMPRISES INCORPORATING IN SAID FUEL FROM 0.5 TO 5.0 GRAMS PER GALLON OF AN OVERBASED OIL SOLUBLE SULFONATE OF A GROUP II METAL HAVING AN ALKALI VALUE OF AT LEAST 50 MG. KOH PER GRAM EQUIVALENT FROM TRANSPARENT COLLOIDALLY DISPERSED GROUP II METAL CARBONATE SUFFICIENT TO INHINIT THE EROSION AND RECESSION OF SAID EXHAUST VALVES AND BURNING SAID FUEL IN SAID ENGINE.
Claim 2
Independent Claim
84 words
THE METHOD OF PREVENTING EROSION OF CAST IRON EXHAUST VALVE SEATS IN AN INTERNAL COMBUSTION ENGINE OPERATING ON LEAD-FREE GASOLINE FUEL WHICH COMPRISES INCORPORATING IN SAID FUEL FROM 0.5 TO 5.0 GRAMS PER GALLON OF AN OVERBASED OIL SOLUBLE SULFONATE OF A GROUP II METAL HAVING AN ALKALI VALUE OF AT LEAST 50 MG. KOH PER GRAM EQUIVALENT FROM TRANSPARENT COLLOIDALLY DISPERSED GROUP II METAL CARBONATE SUFFICIENT TO INHINIT THE EROSION AND RECESSION OF SAID EXHAUST VALVES AND BURNING SAID FUEL IN SAID ENGINE.
Claim 3
Dependent Claim
69 words
The method of claim 1 wherein there is also incorporated in said fuel an oil soluble organic phosphorous compound selected from the class consisting of the phosphoric acid esters and the phosphonates made by treating higher molecular weight olefines having upward of 12 carbon atoms with P2S5 followed by hydrolysis and neutralization, yielding phosphoric acid on combustion in an amount which is substantially equivalent, stoichometrically, to said colloidal carbonate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |