Patent US3092449A successfully refreshed from Google Patents.
US3092449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of europium from low grade europium mixtures with other rare earths
Assignee: Individual
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Filing: 1959-07-13
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Granted: 1963-06-04
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Expires: 1979-07-13
Abstract
No abstract record available.
Inventors
- 👤 Bril Kazimierz Jozef
- 👤 Madjar Jose Behmoiras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:21
CPC Classifications
C; C22; C22B; C22B59/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
IN A METHOD OF RECOVERING EUROPIUM VALUES FROM LOW GRADE EUROPIUM-CONTAINING MIXTURES WITH OTHER RARE EARTHS WHEREIN THE AMOUNT OF EUROPIUM VALUES IS SMALL RELATIVE TO THE OTHER RARE EARTHS, THE STEPS OF ADDING AN ALKALI METAL SULFATE SELECTED FROM THE GROUP CONSISTING OF SODIUM SULFATE AND POTASSIUM SULFATE TO A SOLUTION IN WHICH THE SOLUBILITY OF EUROPOUS SULFATE IS NOT SUFFICIENTLY LOW FOR A SUBSTANTIAL PORTION OF EUROPOUS SULFATE TO PRECIPITATE THEREFROM, SAID SOLUTION CONTAINING RARE EARTH SULFATES AND EUROPIUM VALUES IN EUROPOUS FORM IN AN AMOUNT SUFFICIENT TO PRECIPITATE PART OF SAID RARE EARTHS IN THE FORM OF RARE EARTH-ALKALI METAL-DOULBE SULFATES, THEREBY COPRECIPITATING SAID EUROPIUM VALUES IN THE FORM OF EUROPOUS SULFATE WITH SAID PART OF SAID RARE EARTHALKALI METAL-DOUBLE SULFATES; AND RECOVERING A PRODUCT CONTAINING AN INCREASED PRECENTAGE OF EUROPIUM VALUES AS COMPARED TO THE PERCENTAGE OF EUROPIUM VALUES IN SAID ORIGINAL EUROPIUM-CONTAINING MIXTURE.
Claim 2
Dependent Claim
148 words
IN A METHOD OF RECOVERING EUROPIUM VALUES FROM LOW GRADE EUROPIUM-CONTAINING MIXTURES WITH OTHER RARE EARTHS WHEREIN THE AMOUNT OF EUROPIUM VALUES IS SMALL RELATIVE TO THE OTHER RARE EARTHS, THE STEPS OF ADDING AN ALKALI METAL SULFATE SELECTED FROM THE GROUP CONSISTING OF SODIUM SULFATE AND POTASSIUM SULFATE TO A SOLUTION IN WHICH THE SOLUBILITY OF EUROPOUS SULFATE IS NOT SUFFICIENTLY LOW FOR A SUBSTANTIAL PORTION OF EUROPOUS SULFATE TO PRECIPITATE THEREFROM, SAID SOLUTION CONTAINING RARE EARTH SULFATES AND EUROPIUM VALUES IN EUROPOUS FORM IN AN AMOUNT SUFFICIENT TO PRECIPITATE PART OF SAID RARE EARTHS IN THE FORM OF RARE EARTH-ALKALI METAL-DOULBE SULFATES, THEREBY COPRECIPITATING SAID EUROPIUM VALUES IN THE FORM OF EUROPOUS SULFATE WITH SAID PART OF SAID RARE EARTHALKALI METAL-DOUBLE SULFATES; AND RECOVERING A PRODUCT CONTAINING AN INCREASED PRECENTAGE OF EUROPIUM VALUES AS COMPARED TO THE PERCENTAGE OF EUROPIUM VALUES IN SAID ORIGINAL EUROPIUM-CONTAINING MIXTURE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-06-03 | 1966-12-03 | 1967-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-03 | 1970-12-03 | 1971-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-03 | 1974-12-03 | 1975-06-04 | $7700.00 | Window Closed / Lapsed |