US3748254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conversion of coal by solvent extraction
Assignee: Consolidation Coal Co
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Filing: 1971-12-08
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Granted: 1973-07-24
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Expires: 1991-12-08
Abstract
Abstract SOLID FUEL OR AS SOURCE OF CARBON IN CARBON-STEAM REACTIONS. COAL IS PARTIALLY CONVERTED BY SOLVENT EXTRACTION TO A MIXTURE OF EXTRACT, SOLVENT AND UNDISSOLVED CARBONACEOUS RESIDUE. THE MIXTURE IS SEPARATED INTO LOW SOLIDS-CONTAINING FRACTION AND A HIGH SOLIDS-CONTAINING FRACTION. THE COMPOSITION OF THE LATTER IS ADJUSTED SO THAT ITS ADMIXTURE OF SOLIDS AND LIQUID BINDER (I.E. EXTRACT AND SOLVENT) IS SUCH AS TO MAKE IT PELLETIZABLE. PELLETS ARE FORMED FROM THE PELLETIZABLE COMPOSITION, PREFERABLY IN A ROTARY DRUM AND INDURATED EITHER CONCURRENTLY WITH FORMATION OR SUBSEQUENTLY THERETO. THE INDURATED PELLETS SERVE EITHER AS
Inventors
- 👤 E Gorin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:11
CPC Classifications
C; C10; C10J; C10J3/00; C01; C01B; C01B3/00; C01B3/02; C01B3/32; C01B3/34; C01B3/38; C10B; C10B57/00; C10B57/08; C10G; C10G1/00; C10G1/006; C10G45/00; C10G45/02; C10J3/02; C10J3/20; C10J3/72; C10J3/82; C10J3/84; C10J2300/00; C10J2300/09; C10J2300/0903; C10J2300/0913; C10J2300/093; C10J2300/0946; C10J2300/0953; C10J2300/0956; C10J2300/0959; C10J2300/0973; C10J2300/0976
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |