Patent US3791956A successfully refreshed from Google Patents.
US3791956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conversion of coal to clean fuel
Assignee: Consolidation Coal Co
•
Filing: 1973-02-16
•
Granted: 1974-02-12
•
Expires: 1993-02-16
Abstract
Abstract PRODUCTION OF A LOW MINERAL CONTENT FUEL BY COAL LIQUEFACTION PROCESSES WHICH YEILD AS THEIR PRIMARY PRODUCT A MIXTURE OF LIQUID AND SOLIDS, A PART OF WHICH IS SUSPENDED IN THE LIQUID. THE SUSPENDED SOLIDS ARE EFFECTIVELY REMOVED WITH MINIMUM LOSS OF DESIRED PRODUCT BY MEANS OF A PRECIPITATING SOLVENT WHICH SERVES THREE FUNCTIONS, (1) TO EFFECT AGGLOMERATION OF THE SUSPENDED FINES, (2) TO PREVENT REDISPERSAL OF THE FINES IN THE WASHING OPERATION, AND (3) TO RECOVER DESIRED PRODUCT FROM THE REJECTED SOLIDS.
Inventors
- 👤 E Gorin
- 👤 C Kulik
- 👤 H Lebowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:17
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/04; C10G1/045
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |