US3671418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal liquefaction process using ash as a catalyst
Assignee: Universal Oil Products Co
•
Filing: 1970-12-18
•
Granted: 1972-06-20
•
Expires: 1990-12-18
Abstract
Abstract A method for the liquefaction of coal using a solvent extraction process in which finely-divided coal, a solvent, and a catalystacting ash derived from coal are admixed and subjected to solvent extraction conditions. The ash utilized in the solvent extraction process is a substantially carbon-free residue resulting from the decarbonization of coal.
Inventors
- 👤 John G Gatsis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:38
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/08; C10G1/083; C10G1/006
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
18 words
The process of claim 1 further characterized in that said catalytic ash is derived from said solid residuum.
Claim 2
Dependent Claim
21 words
The process of claim 1 further characterized in that said catalytic ash is derived from the decarbonization of said solid residuum.
Claim 3
Dependent Claim
17 words
The process of claim 1 further characterized in that said solvent extraction conditions include a hydrogen atmosphere.
Claim 4
Dependent Claim
15 words
The process of claim 1 further characterized in that said solid carbonaceous material is coal.
Claim 5
Dependent Claim
28 words
The process of claim 1 further characterized in that said solid residuum is subjected to coking at a temperature below about 1,150* F. to produce said catalytic ash.
Claim 6
Dependent Claim
29 words
The process of claim 1 further characterized in that said solid residuum is burned in air at a temperature below about 1, 150* F. to produce said catalytic ash.
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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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |