Patent US3399722A successfully refreshed from Google Patents.
US3399722A
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Recovery of petroleum by a cyclic thermal method
Assignee: Pan American Petroleum Corp
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Filing: 1967-05-24
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Granted: 1968-09-03
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Expires: 1987-05-24
Abstract
No abstract record available.
Inventors
- 👤 Thomas S Buxton
- 👤 James E Pease
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:03
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; E21B43/243
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3172470A
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US3342258A
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US3349847A
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US3284281A
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US3332482A
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US3333637A
Cited
US3349843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-03 | 1972-03-04 | 1972-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-03 | 1976-03-04 | 1976-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-03 | 1980-03-04 | 1980-09-03 | $7700.00 | Window Closed / Lapsed |