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US3407003A
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Method of recovering hydrocarbons from an underground hydrocarbon-containing shale formation
Assignee: Shell USA Inc
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Filing: 1966-09-29
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Granted: 1968-10-22
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Expires: 1986-09-29
Abstract
No abstract record available.
Inventors
- 👤 Robert W Durie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:31
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US823749A
Cited
GB163519A
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US1612611A
Cited
US2561639A
Cited
US2847202A
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US2983103A
Cited
US3159562A
Cited
US3273640A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-22 | 1972-04-22 | 1972-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-22 | 1976-04-22 | 1976-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-22 | 1980-04-22 | 1980-10-22 | $7700.00 | Window Closed / Lapsed |