US2556496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of coal
Assignee: GREAT LAKES CARBON Corp
•
Filing: 1947-12-09
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Granted: 1951-06-12
•
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 15:49
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
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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) | 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 |