Patent US1851356A successfully refreshed from Google Patents.
US2761663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of underground gasification of coal
Assignee: Individual
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Filing: 1952-09-05
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Granted: 1956-09-04
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Expires: 1972-09-05
Abstract
No abstract record available.
Inventors
- 👤 Louis F Gerdetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:50
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/295
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PROCESS OF PRODUCING GAS FROM CARBONACEOUS MATERIAL IN SITU, COMPRISING THE STEPS OF FORMING A PANEL OF SAID MATERIAL WITH SUBSTANTIALLY HORIZONTAL INLET AND OUTLET PASSAGES ON OPPOSITE SIDES OF THE PANEL, WITH A ROW OF PILLARS OF SAID MATERIAL SPACED APART WITH OPENINGS THEREBETWEEN AND SUBSTANTIALLY SURROUNDING THE PANEL AND SPACED THEREFROM, DRILLING HOLES THROUGH SAID PANEL FROM THE FACES THEREOF, IGNITING SAID PANEL OF MATERIAL, CIRCULATING AIR THROUGH THE INLET PASSAGE AND THROUGH OPENINGS BETWEEN THE PILLARS TO SAID PANEL TO SUPPORT COMBUSTION THEREOF, REGULATING COMBUSTION BY CONTROLLING THE OPENINGS BETWEEN THE PILLARS, AND EXHAUSTING THE GAS THEREFROM THROUGH THE EXHAUST PASSAGE.
Claim 2
Dependent Claim
105 words
A PROCESS OF PRODUCING GAS FROM CARBONACEOUS MATERIAL IN SITU, COMPRISING THE STEPS OF FORMING A PANEL OF SAID MATERIAL WITH SUBSTANTIALLY HORIZONTAL INLET AND OUTLET PASSAGES ON OPPOSITE SIDES OF THE PANEL, WITH A ROW OF PILLARS OF SAID MATERIAL SPACED APART WITH OPENINGS THEREBETWEEN AND SUBSTANTIALLY SURROUNDING THE PANEL AND SPACED THEREFROM, DRILLING HOLES THROUGH SAID PANEL FROM THE FACES THEREOF, IGNITING SAID PANEL OF MATERIAL, CIRCULATING AIR THROUGH THE INLET PASSAGE AND THROUGH OPENINGS BETWEEN THE PILLARS TO SAID PANEL TO SUPPORT COMBUSTION THEREOF, REGULATING COMBUSTION BY CONTROLLING THE OPENINGS BETWEEN THE PILLARS, AND EXHAUSTING THE GAS THEREFROM THROUGH THE EXHAUST PASSAGE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |