Patent US3870237A successfully refreshed from Google Patents.
US3870237A
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Chemical comminution of coal and removal of ash including sulfur in inorganic form therefrom
Assignee: Syracuse University
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Filing: 1974-02-14
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Granted: 1975-03-11
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Expires: 1994-02-14
Abstract
Abstract Treatment of coal with ammonia which contains water, whether the coal is in a sub-surface stratum or in large lumps as mined by standard means weakens interlayer forces at natural interfaces present in the coal. The extent to which the interlayer forces may be reduced by this treatment is such that the coal may be reduced to fragments without application of mechanical force. Further, inorganic compounds present in the coal are unaffected by said treatment, as a result of which inorganic components, and, particularly, sulfur compounds may readily be separated from the coal fragments by known means.
Inventors
- 👤 Robert G Aldrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:21
CPC Classifications
B; B02; B02C; B02C19/00; C; C10; C10L; C10L9/00; E; E21; E21B; E21B43/00; E21B43/28; E21B43/29; E21B43/34; E21B43/35
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
38 words
A METHOD OF REDUCING INTERLAYER FORCES AT NATURAL INTERFACES PRESENT IN COAL, COMPRISING THE STEP OF TREATING SAID COAL WITH AN EFFECTIVE AMOUNT MOIST AMMONIA WHERE THE RATIO OF WATER TO AMMONIA IS UP TO 72.28 BY WEIGHT.
Claim 2
Independent Claim
38 words
A METHOD OF REDUCING INTERLAYER FORCES AT NATURAL INTERFACES PRESENT IN COAL, COMPRISING THE STEP OF TREATING SAID COAL WITH AN EFFECTIVE AMOUNT MOIST AMMONIA WHERE THE RATIO OF WATER TO AMMONIA IS UP TO 72.28 BY WEIGHT.
Claim 3
Independent Claim
39 words
A method of reducing interlayer forces at natural interfaces present in coal, comprising the step of treating said coal with an effective amount of moist ammonia where the ratio of water to ammonia is up to 72:28 by weight.
Claim 4
Independent Claim
39 words
A method of reducing interlayer forces at natural interfaces present in coal, comprising the step of treating said coal with an effective amount of moist ammonia where the ratio of water to ammonia is up to 72:28 by weight.
References Cited (Backward Citations)
US3815826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |