Patent US3034580A successfully refreshed from Google Patents.
US3034580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
In situ combustion of lignite
Assignee: Phillips Petroleum Co
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Filing: 1959-08-31
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Granted: 1962-05-15
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Expires: 1979-08-31
Abstract
No abstract record available.
Inventors
- 👤 Frederick E Frey
- 👤 Francis W Crawford
- 👤 John W Marx
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:27
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; E21B43/243
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
120 words
A PROCESS FOR PRODUCING FUEL GASED AND LIQUIDS FROM A LIGNITE STRATUM CONTAINING AT LEAST 10 WEIGHT PERCENT OXYGEN AUTOGENOUS IN SITU COMBUSTION WHICH COMPRISES PROVIDING A WALL EXTENDING FROM GROUND LEVEL INTO SAID STRATUM AND A TUBING STRING IN SAID WELL FORMING AN ANNULUS WITH THE WALL OF SAID WELL; IGNITE THE LIGNITE ADJACENT SAID WELL BY HEATING SAME TO IGNITION TEMPERATURE AND INJECTING COMBUSTION-SUPPORTING GAS THRU ONE OF SAID ANNULUS AND SAID TUBING SO AS TO CONTACT THE HEATED LIGNITED WITH SAID GAS AND ESTABLISH A COMBUSTION ZONE, IN SAID LIGNITE; AFTER INGINITION IS EFFECTED, TERMINATING THE FLOW OF SAID GAS AND SUBMITTING THEREFOR AN O2-FREE FLUSHING GAS TO REMOVE FROM SAID WELL FLUIDS PRODUCE BY THE COMBUSTION.
References Cited (Backward Citations)
US2786660A
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US2584605A
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US2780449A
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US2761512A
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US2917112A
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US2952450A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-14 | 1965-11-13 | 1966-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-14 | 1969-11-13 | 1970-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-14 | 1973-11-13 | 1974-05-15 | $7700.00 | Window Closed / Lapsed |