US2574008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of extracting gallium oxide from aluminous substances
Assignee: Pechiney SA
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Filing: 1947-12-20
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Granted: 1951-11-06
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Expires: 1967-12-20
Abstract
No abstract record available.
Inventors
- 👤 Beja Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:50
CPC Classifications
C; C22; C22B; C22B58/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
GIVEN A CAUSTIC ALKALI SOLUTION OF ALUMINOUS MATERIAL CONTAINING A SMALL AMOUNT OF GALLIUM AND OF SUFFICIENTLY HIGH CONCENTRATION IN AL2O3 TO BE UNSTABLE, THE METHOD OF SEPARATING AND RECOVERING THE GALLIUM CONTENT THEREOF WHICH COMPRISES FIRST PRECIPITATING BY HYDROLYSIS AND REMOVING FROM THE SOLUTION SUBSTANTIALLY PURE ALUMINUM HYDROXID TO REDUCE ITS CONCENTRATION IN AL2O3, PARTIALLY NEUTRALIZING THE SOLUTION BY AN ACID ADDED THERETO IN SMALL INCREMENTS TO SLOWLY PRECIPITATE FURTHER ALUMINUM HYDROXID, REMOVING THIS SECOND PRECIPITATE FROM THE SOLUTION, THEREAFTER ACIDIFYING THE SOLUTION SUFFICIENTLY TO CAUSE SUBSTANTIALLY ALL OF THE ALUMINUM AND GALLIUM CONTENT REMAINING IN THE SOLUTION TO PRECIPITATE TOGETHER AS HYDROXIDS, REMOVING THE LATTER HYDROXIDS AND TREATING THEM TO RECOVER THEIR GALLUM CONTENT.
Claim 2
Dependent Claim
116 words
GIVEN A CAUSTIC ALKALI SOLUTION OF ALUMINOUS MATERIAL CONTAINING A SMALL AMOUNT OF GALLIUM AND OF SUFFICIENTLY HIGH CONCENTRATION IN AL2O3 TO BE UNSTABLE, THE METHOD OF SEPARATING AND RECOVERING THE GALLIUM CONTENT THEREOF WHICH COMPRISES FIRST PRECIPITATING BY HYDROLYSIS AND REMOVING FROM THE SOLUTION SUBSTANTIALLY PURE ALUMINUM HYDROXID TO REDUCE ITS CONCENTRATION IN AL2O3, PARTIALLY NEUTRALIZING THE SOLUTION BY AN ACID ADDED THERETO IN SMALL INCREMENTS TO SLOWLY PRECIPITATE FURTHER ALUMINUM HYDROXID, REMOVING THIS SECOND PRECIPITATE FROM THE SOLUTION, THEREAFTER ACIDIFYING THE SOLUTION SUFFICIENTLY TO CAUSE SUBSTANTIALLY ALL OF THE ALUMINUM AND GALLIUM CONTENT REMAINING IN THE SOLUTION TO PRECIPITATE TOGETHER AS HYDROXIDS, REMOVING THE LATTER HYDROXIDS AND TREATING THEM TO RECOVER THEIR GALLUM CONTENT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-05 | 1955-05-07 | 1955-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-05 | 1959-05-07 | 1959-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-05 | 1963-05-07 | 1963-11-06 | $7700.00 | Window Closed / Lapsed |