Patent US3632479A successfully refreshed from Google Patents.
US3632479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of coal to prevent agglomeration
Assignee: BERNARD S LEE
•
Filing: 1969-08-25
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Granted: 1972-01-04
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Expires: 1989-08-25
Abstract
Abstract A liquid slurry of coal is treated with an oxygen-containing gas at elevated temperature and pressure to effect surface oxidation of the coal. The coal is thus rendered nonagglomerating and is suitable for utilization as feed in a high-pressure hydrogasification process.
Inventors
- 👤 Bernard S Lee
- 👤 Frank C Schora Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:59
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/30; C; C10; C10L; C10L9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
The process of claim 1 in which the oxygen-containing gas is oxygen.
Claim 2
Dependent Claim
12 words
The process of claim 1 in which the oxygen-containing gas is air.
References Cited (Backward Citations)
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Cited
GB304404A
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US2054725A
Cited
US1960917A
Cited
GB453265A
Cited
US2336151A
Cited
US2336154A
Cited
US2704704A
Cited
US2805189A
Cited
US2712495A
Cited
DE1103889B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |