US3185545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of alumina
Assignee: Commonwealth Scientific and Industrial Research Organisation
•
Filing: 1962-11-08
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Granted: 1965-05-25
•
Expires: 1982-11-08
Abstract
No abstract record available.
Inventors
- 👤 Scott Thomas Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:24
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/20; C01F7/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
IN AN ACID PROCESS FOR THE PRODUCTION OF ALUMINA FROM AN ACID DIGESTION LIQUOR PRODUCED BY DISSOLVING AN ALUMINUM-BEARING ORE IN SULFURIC ACID, THE STEPS OF DIGESTING AN ALUMINUM-BEARING ORE IN THE ACID DIGESTION LIQUOR AT A TEMPERATURE BETWEEN ABOUT 100*C. AND ABOUT 140*C. TO REDUCE THE RATIO BY WEIGHT OF SO3$AL2O3 IN THE DIGESTION LIQUOR TO A VALUE WITHIN THE RANGE OF 1.3 TO 2.35, FILTERING THE LIQUOR TO REMOVE SOLID RESIDUE, TREATING THE THUSLY MODIFIED DIGESTION LIQUOR WITH A REDUCING AGENT
Claim 2
Dependent Claim
83 words
IN AN ACID PROCESS FOR THE PRODUCTION OF ALUMINA FROM AN ACID DIGESTION LIQUOR PRODUCED BY DISSOLVING AN ALUMINUM-BEARING ORE IN SULFURIC ACID, THE STEPS OF DIGESTING AN ALUMINUM-BEARING ORE IN THE ACID DIGESTION LIQUOR AT A TEMPERATURE BETWEEN ABOUT 100*C. AND ABOUT 140*C. TO REDUCE THE RATIO BY WEIGHT OF SO3$AL2O3 IN THE DIGESTION LIQUOR TO A VALUE WITHIN THE RANGE OF 1.3 TO 2.35, FILTERING THE LIQUOR TO REMOVE SOLID RESIDUE, TREATING THE THUSLY MODIFIED DIGESTION LIQUOR WITH A REDUCING AGENT
References Cited (Backward Citations)
US1256605A
Cited
GB123720A
Cited
US1663435A
Cited
US1752599A
Cited
US2323499A
Cited
US2332285A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-05-24 | 1968-11-23 | 1969-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-24 | 1972-11-23 | 1973-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-24 | 1976-11-23 | 1977-05-25 | $7700.00 | Window Closed / Lapsed |