US3474862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reverse combustion method of recovering oil from steeply dipping reservoir interval
Assignee: Shell USA Inc
•
Filing: 1968-07-23
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Granted: 1969-10-28
•
Expires: 1988-07-23
Abstract
No abstract record available.
Inventors
- 👤 Edmond Hubert Bruist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:11
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/30; E21B43/305; E21B43/16; E21B43/24; E21B43/243
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2874777A
Cited
US2793696A
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US3024013A
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US3228468A
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US3223158A
Cited
US3227211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |