Patent US2595979A successfully refreshed from Google Patents.
US2595979A
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US
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Underground liquefaction of coal
Assignee: Texaco Inc
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Filing: 1949-01-25
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Granted: 1952-05-06
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Expires: 1969-01-25
Abstract
No abstract record available.
Inventors
- 👤 Ernest F Pevere
- 👤 George B Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:28
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/04; C10G1/042; C10G1/06; E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; E21B43/25; E21B43/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A PROCESS FOR THE RECOVERY OF COAL FROM UNDERGROUND DEPOSITS WHICH COMPRISES CONTACTING THE COAL IN SITU WITH A HYDROGENATING AGENT SELECTED FROM THE GROUP CONSISTING OF FREE HYDROGEN AND HYDROAROMATIC COMPOUNDS AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 550* F. TO ABOUT 850* F. AND A PRESSURE ABOVE ABOUT 1,000 POUNDS PER SQUARE INCH GAUGE EFFECTIVE TO HYDROGENATE A PORTION OF THE COAL SUBSTANCE TO FORM A LIQUID, AND
Claim 2
Dependent Claim
71 words
A PROCESS FOR THE RECOVERY OF COAL FROM UNDERGROUND DEPOSITS WHICH COMPRISES CONTACTING THE COAL IN SITU WITH A HYDROGENATING AGENT SELECTED FROM THE GROUP CONSISTING OF FREE HYDROGEN AND HYDROAROMATIC COMPOUNDS AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 550* F. TO ABOUT 850* F. AND A PRESSURE ABOVE ABOUT 1,000 POUNDS PER SQUARE INCH GAUGE EFFECTIVE TO HYDROGENATE A PORTION OF THE COAL SUBSTANCE TO FORM A LIQUID, AND
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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) | 1955-05-06 | 1955-11-05 | 1956-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-06 | 1959-11-05 | 1960-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-06 | 1963-11-05 | 1964-05-06 | $7700.00 | Window Closed / Lapsed |