Patent US2556496A successfully refreshed from Google Patents.
US2556496A
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Purification of coal
Assignee: GREAT LAKES CARBON Corp
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Filing: 1947-12-09
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Granted: 1951-06-12
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Expires: 1967-12-09
Abstract
No abstract record available.
Inventors
- 👤 John H Hickey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:52
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/02; C01; C01B; C01B32/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A PROCESS FOR PURIFYING BITUMINOUS COAL WHICH COMPRISES HEATING SAID COAL IN PARTICULATE FORM WITH AN AQUEOUS SOLUTION OF AN ALKALI METAL HYDROXIDE AND AN ADDED VOLTALIZABLE ALKALI SOLUBLE ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF AN ALIPHATIC ALCOHOL, A MONO-HYDROXYL PHENOL, A POLYHYDROXY PHENOL AND A SAPONIFIABLE ESTER OF SAID COMPOUNDS, SAID COMPOUND BEING PRESENT IN AN AMOUNT OF ABOUT 0.1 TO ABOUT 10% BY WEIGHT OF THE TREATING SOLUTION, THE TEMPERATURE OF TREATMENT BEING ABOUT 90 TO ABOUT 200* C., FOR A TIME SUFFICIENT TO DISSOLVE
Claim 2
Dependent Claim
89 words
A PROCESS FOR PURIFYING BITUMINOUS COAL WHICH COMPRISES HEATING SAID COAL IN PARTICULATE FORM WITH AN AQUEOUS SOLUTION OF AN ALKALI METAL HYDROXIDE AND AN ADDED VOLTALIZABLE ALKALI SOLUBLE ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF AN ALIPHATIC ALCOHOL, A MONO-HYDROXYL PHENOL, A POLYHYDROXY PHENOL AND A SAPONIFIABLE ESTER OF SAID COMPOUNDS, SAID COMPOUND BEING PRESENT IN AN AMOUNT OF ABOUT 0.1 TO ABOUT 10% BY WEIGHT OF THE TREATING SOLUTION, THE TEMPERATURE OF TREATMENT BEING ABOUT 90 TO ABOUT 200* C., FOR A TIME SUFFICIENT TO DISSOLVE
References Cited (Backward Citations)
US831805A
Cited
US1188936A
Cited
US1420754A
Cited
US1416955A
Cited
US1824326A
Cited
US1614352A
Cited
US1538626A
Cited
US1780154A
Cited
US1820917A
Cited
US1871121A
Cited
FR875633A
Cited
US2342585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |