Patent US2474345A successfully refreshed from Google Patents.
US2474345A
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US
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Recovery of hydrocarbons from oil shale
Assignee: Phillips Petroleum Co
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Filing: 1947-05-19
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Granted: 1949-06-28
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Expires: 1967-05-19
Abstract
No abstract record available.
Inventors
- 👤 Clark Alfred
- 👤 Howard R Sailors
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:09
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/02; C10G1/002; Y; Y10; Y10S; Y10S48/00; Y10S48/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1432101A
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US1115776A
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US1669439A
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US1899887A
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US1983943A
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US2245157A
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US2396036A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-27 | 1952-12-27 | 1953-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-27 | 1956-12-27 | 1957-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-27 | 1960-12-27 | 1961-06-28 | $7700.00 | Window Closed / Lapsed |