US3955938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gasoline composition containing a sodium additive
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1973-08-21
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Granted: 1976-05-11
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Expires: 1993-08-21
Abstract
Abstract Sodium containing additives in gasoline reduce valve seat recession and give other improvements in automotive internal combustion engines operating on lead-free gasoline. Preferably, the sodium-containing additive is a sodium derivative of an organic compound, e.g., a salt of an organic acid, or a dispersion of a sodium salt of an inorganic acid, e.g., a sodium carbonate dispersion.
Inventors
- 👤 John P. Graham
- 👤 Jack Ryer
- 👤 Sidney J. Lestz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:09
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/12; C10L1/1233; C10L1/14; C10L1/18; C10L1/182; C10L1/1828; C10L1/188; C10L1/1881; C10L1/24; C10L1/2431; C10L1/2437; C10L1/26; C10L1/2691
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A lead-free gasoline composition comprising a major proportion of gasoline having a total metal content of less than about 2 parts per million of lead and about 1.7 to 13.6 parts per million of sodium; said sodium being present in the form of a sodium additive effective in inhibiting valve seat recession and in an amount equivalent to about 0.5 to about 4 pounds of sodium per thousand barrels of gasoline; said sodium additive being a colloidal dispersion of sodium carbonate formed by adding carbon dioxide and an aqueous solution of sodium hydroxide to an oil solution of: a P 2 S 5 treated polyisobutylene having a molecular weight in the range of about 700-100,000 as a surfactant, and an alkyl phenol having a molecular weight in the range of about 200 to 700 as a promoter; and heating to dehydrate the resulting mixture and to form said sodium additive.
Claim 2
Dependent Claim
150 words
A lead-free gasoline composition comprising a major proportion of gasoline having a total metal content of less than about 2 parts per million of lead and about 1.7 to 13.6 parts per million of sodium; said sodium being present in the form of a sodium additive effective in inhibiting valve seat recession and in an amount equivalent to about 0.5 to about 4 pounds of sodium per thousand barrels of gasoline; said sodium additive being a colloidal dispersion of sodium carbonate formed by adding carbon dioxide and an aqueous solution of sodium hydroxide to an oil solution of: a P 2 S 5 treated polyisobutylene having a molecular weight in the range of about 700-100,000 as a surfactant, and an alkyl phenol having a molecular weight in the range of about 200 to 700 as a promoter; and heating to dehydrate the resulting mixture and to form said sodium additive.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |