Patent US2935974A successfully refreshed from Google Patents.
US2935974A
Expired / Lapsed
US
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Hydrocarbon fuels having improved antiknock properties
Assignee: EIDP Inc
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Filing: 1957-02-18
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Granted: 1960-05-10
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Expires: 1977-02-18
Abstract
No abstract record available.
Inventors
- 👤 Charles A Sandy
- 👤 James H Werntz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:12
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/18; C10L1/188; C10L1/1881
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
86 words
IN THE METHOD OF OPERATING A SPARK IGNITION INTERNAL COMBUSTION ENGINE IN WHICH THE FUEL IS INTRODUCED INTO THE COMBUSTION CHAMBERS OF THE CYLINDERS UNDER SUBATMOSPHERIC TO SUPERATMOSPHERIC PRESSURES, THE STEP WHICH COMPRISES IMPROVING THE KNOCK RESISTANCE OF THE FUEL BY INTRODUCING INTO THE COMBUSTION CHAMBER SO THAT IT IS PRESENT AT THE TIME THE FUEL IS IGNITED, A LITHIUM SALT OF A SECONDARY CARBOXYLIC ACID AT THE RATE OF FROM 0.05 GRAM TO 50 GRAMS PER GALLON OF FUEL, SAID CARBOXYLIC ACID HAVING THE FORMULA
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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) | 1963-05-10 | 1963-11-09 | 1964-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-10 | 1967-11-09 | 1968-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-10 | 1971-11-09 | 1972-05-10 | $7700.00 | Window Closed / Lapsed |