US3298434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gasification of coal
Assignee: Individual
•
Filing: 1964-05-27
•
Granted: 1967-01-17
•
Expires: 1984-05-27
Abstract
No abstract record available.
Inventors
- 👤 Thomas T Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:11
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 METHOD OF RECOVERING GASES FROM A COAL SEAM INTO WHICH A WELL BORE EXTENDS, SAID BORE HAVING A TUBING THEREIN EXTENDING DOWN TO AT LEST THE COAL SEAM COMPRISING, INJECTING AIR INTO SAID COAL, IGNITING THE COAL, THEREAFTER INJECTING AIR AND STEAM INTO THE COAL, PERIODICALLY OPENING SAID TUBING AT THE SURFACE TO REFLUX THE COAL SEAM AND REMOVE FROM THE WELL BORE LIQUIDS WHICH MAY HAVE ACCUMULATED THEREIN, DETERMINING THE TEMPERATURE IN THE COAL SEAM BY DETERMINING THE CONDITION OF THE RELFUX FLUIDS, CONTROLLING THE INJECTION OF STEAM AND AIR AS REQUIRED BY THE CONDITION OF THE REFLUX FLUIDS TO OBTAIN SELECTED TEMPERATURE CONDITIONS IN THE WELL, AND RECOVERING THE GASEOUS PRODUCTS OF COMBUSTION FROM SAID COAL SEAM.
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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) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |