US2722277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery by combustion of petroleum oil from partially depleted subterranean reservoirs
Assignee: ExxonMobil Oil Corp
•
Filing: 1950-01-27
•
Granted: 1955-11-01
•
Expires: 1970-01-27
Abstract
No abstract record available.
Inventors
- 👤 Paul B Crawford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:28
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; E21B43/243
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
IN A PROCESS FOR THE RECOVERY OF PETROLEUM OIL FROM A PARTIALLY DEPLETED SUBTERRANEAN PETROLEUM OIL RESERVOIR WHEREIN AN OXIDIZING GAS IS PASSED TO SAID RESERVOIR THROUGH AN INPUT WELL LEADING THERETO AND FORCED THROUGH SAID RESERVOIR TO AN OUTPUT WELL LEADING THEREFROM AND COMBUSTION OF A PORTION OF THE PETROLEUM OIL CONTAINED IN SAID RESERVOIR IS MAINTAINED WITHIN SAID RESERVOIR FOR THE PURPOSE OF WITHDRAWING PETROLEUM PRODUCTS AND COMBUSTION PRODUCTS FROM SAID RESERVOIR THROUGH SAID OUTPUT WELL, THE IMPROVEMENT COMPRISING ADDING FORMALDEHYDE TO SAID OXIDIZING GAS PASSED TO SAID RESERVOIR.
Claim 2
Dependent Claim
91 words
IN A PROCESS FOR THE RECOVERY OF PETROLEUM OIL FROM A PARTIALLY DEPLETED SUBTERRANEAN PETROLEUM OIL RESERVOIR WHEREIN AN OXIDIZING GAS IS PASSED TO SAID RESERVOIR THROUGH AN INPUT WELL LEADING THERETO AND FORCED THROUGH SAID RESERVOIR TO AN OUTPUT WELL LEADING THEREFROM AND COMBUSTION OF A PORTION OF THE PETROLEUM OIL CONTAINED IN SAID RESERVOIR IS MAINTAINED WITHIN SAID RESERVOIR FOR THE PURPOSE OF WITHDRAWING PETROLEUM PRODUCTS AND COMBUSTION PRODUCTS FROM SAID RESERVOIR THROUGH SAID OUTPUT WELL, THE IMPROVEMENT COMPRISING ADDING FORMALDEHYDE TO SAID OXIDIZING GAS PASSED TO SAID RESERVOIR.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-31 | 1959-05-02 | 1959-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-31 | 1963-05-02 | 1963-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-31 | 1967-05-02 | 1967-11-01 | $7700.00 | Window Closed / Lapsed |