Patent US3759673A successfully refreshed from Google Patents.
US3759673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal desulfurization process
Assignee: Peabody Development Co
•
Filing: 1971-11-05
•
Granted: 1973-09-18
•
Expires: 1991-11-05
Abstract
Abstract COAL IS TREATED IN A REDUCING ATMOSPHERE IN A FLUID BED REACTOR TO PARTIALLY DEVOLATILIZE IT, REMOVE ALL MOISTURE, AND REMOVE SOME H2S AND SO2. THE THEN CHARRDD COAL IS TREATED IN A MULTI-STAGE CONTACTOR WITH HOT GAS COMPOSED OF HYDROGEN AND METHANE TO REMOVE MOST OF THE REMAINING SULFUR.
Inventors
- 👤 J Agarwal
- 👤 L Petrovic
- 👤 C Whitten
- 👤 V Mansfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:06
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/08; C10L9/02; C10L9/04
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |