US3723079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of coal
Assignee: Sun Research and Development Co
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Filing: 1971-07-23
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Granted: 1973-03-27
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Expires: 1991-07-23
Abstract
Abstract A process for stabilizing dried lignitic and subbituminous coal against spontaneous combustion which comprises treating said dried coal at about 175* to about 225* C. with oxygen in an amount of from about 0.5 percent to about 8 percent by weight of said coal and rehydrating the oxygen treated coal with water in an amount of from about 1.5 percent to about 6 percent by weight of said oxygen treated coal.
Inventors
- 👤 W Seitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:39
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/02; C10L9/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
19 words
The process of claim 1 where the amount of water is from about 3 percent to about 6 percent.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |