Patent US3412794A successfully refreshed from Google Patents.
US3412794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of oil by steam flood
Assignee: Phillips Petroleum Co
•
Filing: 1966-11-23
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Granted: 1968-11-26
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Expires: 1986-11-23
Abstract
No abstract record available.
Inventors
- 👤 Emery M Craighead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:05
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; E21B43/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2734578A
Cited
US2731414A
Cited
US2897894A
Cited
US3155160A
Cited
US3129758A
Cited
US3269460A
Cited
US3347313A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-26 | 1972-05-27 | 1972-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-26 | 1976-05-27 | 1976-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-26 | 1980-05-27 | 1980-11-26 | $7700.00 | Window Closed / Lapsed |