Patent US3788992A successfully refreshed from Google Patents.
Patent US2935973A successfully refreshed from Google Patents.
US2935973A
Expired / Lapsed
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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 10:13
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
88 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 INTRODUCING INTO THE COMBUSTION CHAMBER SO THAT IT IS PRESENT AT THE TIME THE FUEL IS IGNITED, A LITHIUM SALT OF AN ORGANIC TERTIARY CARBOXYLIC ACID, THE ORGANIC RADICAL TO WHICH THE CARBOXYL GROUP IS ATTACHED CONTAINING ONLY CRABON AND HYDROGEN, AT THE RATE OF FROM 0.05 GRAM TO 50 GRAMS PER GALLON OF FUEL.
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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 |