US2637636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color stabilizers
Assignee: Shell Development Co
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Filing: 1951-05-14
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Granted: 1953-05-05
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Expires: 1971-05-14
Abstract
No abstract record available.
Inventors
- 👤 Ernest L Walters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:37
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/18; C10L1/182; C10L1/183; C10L1/1832; C10L1/22; C10L1/222; C10L1/2222; C10L1/223; C10L1/228; C10L1/2283; C10L1/232
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
AN AVIATION GASOLINE COMPOSITION SUBSTANTIALLY FREE FROM UNSATURATED GUM-FORMING HYDROCARBONS AND CONTAINING AN AROMATIC AMINE AND TETRA ETHYL LEAD, STABILIZED AGAINST GUM FORMATION AND TETRA ETHYL LEAD DECOMPOSITION BY THE INCORPORATION THEREIN OF A MINOR PROPORTION OF 8-HYDROXYQUINOLINE.
Claim 2
Dependent Claim
38 words
AN AVIATION GASOLINE COMPOSITION SUBSTANTIALLY FREE FROM UNSATURATED GUM-FORMING HYDROCARBONS AND CONTAINING AN AROMATIC AMINE AND TETRA ETHYL LEAD, STABILIZED AGAINST GUM FORMATION AND TETRA ETHYL LEAD DECOMPOSITION BY THE INCORPORATION THEREIN OF A MINOR PROPORTION OF 8-HYDROXYQUINOLINE.
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) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |