Patent US3464491A successfully refreshed from Google Patents.
US3464491A
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Oil recovery from formations containing channels
Assignee: Pan American Petroleum Corp
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Filing: 1967-12-18
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Granted: 1969-09-02
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Expires: 1987-12-18
Abstract
No abstract record available.
Inventors
- 👤 H R Froning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:12
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; E21B43/243; E21B33/00; E21B33/10; E21B33/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3199588A
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US3251414A
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US3269460A
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US3273640A
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US3318379A
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US3369601A
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US3330346A
Cited
US3342261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-01 | 1973-03-03 | 1973-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-01 | 1977-03-03 | 1977-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-01 | 1981-03-03 | 1981-09-02 | $7700.00 | Window Closed / Lapsed |