US3605885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth formation heating apparatus
Assignee: Individual
•
Filing: 1969-07-14
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Granted: 1971-09-20
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Expires: 1989-07-14
Abstract
Abstract A DOUBLE WALLED INSULATED COMBUSTION CHAMBER HAVING FUEL INLET PORTS AND A HEATED GAS EXHAUSE PORT HAS ITS EXHAUSE PORT CONNECTED TO TUBING EXTENDING INTO A WELL BORE. WATER RECEIVED BY A JACKET SURROUNDING THE COMBUSTION CHAMBER IS CONVERTED TO STEAM AND INJECTED INTO THE FLOW OF HEATED GASES DOWN STREAM FROM THE EXHAUST PORT. PRESSURE GENERATED BY COMBUSTIONS FORCES THE HEATED GASES AND STEAM INTO THE WELL BORE FOR HEATING PIPE AND EARTH FORMATION.
Inventors
- 👤 Johnnie L Leeper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:29
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/02; E21B36/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |