Patent US3787193A successfully refreshed from Google Patents.
US3787193A
Expired / Lapsed
US
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Production of water gas
Assignee: FMC Corp
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Filing: 1971-11-18
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Granted: 1974-01-22
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Expires: 1991-11-18
Abstract
Abstract Water gas is produced by blowing steam through carbon suspended in a coal ash melt in a gasification section, the endothermic heat of reaction being supplied by the ash melt, which is continuously recirculating through a separate superheating section where the ash is superheated by burning fuel separately introduced into that section; the superheated ash is then conveyed to the gasification section, substantially free of oxidative gas, preferably by means of a heated gas lift.
Inventors
- 👤 L Seglin
- 👤 C Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:08
CPC Classifications
C; C10; C10J; C10J3/00; C10J3/57; C10J3/72; C10J3/74; C10J3/76; C10J3/82; C10J3/84; C10J2300/00; C10J2300/09; C10J2300/0913; C10J2300/093; C10J2300/094; C10J2300/0953; C10J2300/0956; C10J2300/0973; C10J2300/0976; C10J2300/12; C10J2300/1253; C10J2300/16; C10J2300/164; C10J2300/1656; C10J2300/1662; C10J2300/18; C10J2300/1861; C10J2300/1884; C10J2300/1892
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
The method of claim 1, in which the heated slag is propelled into the gasification zone by an air lift operated by hot products of combustion.
Claim 2
Dependent Claim
26 words
The method of claim 1, in which the carbon is coal or coal char, and the slag is ash derived from the coal or coal char.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |