Patent US3092448A successfully refreshed from Google Patents.
US3092448A
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Process for separating niobium and tantalum
Assignee: EIDP Inc
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Filing: 1960-08-31
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Granted: 1963-06-04
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Expires: 1980-08-31
Abstract
No abstract record available.
Inventors
- 👤 John H Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:42
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
THE PROCESS FOR SEPARATING NIOBIUM AND TANTALUM FROM EACH OTHER WHICH COMPRISES PREPARING A NIOBATE-TANTALATE SOLUTION CONTAINING HYDROXIDE ION IN A CONCENTRATION OF AT LEAST ABOUT 0.01 MOLAR; ADDING SODIUM ION AND POTASSIUM ION TO SAID SOLUTION IN A CONCENTRATION SUFFICIENT TO PROVIDE A MOLAR RATIO OF COMBINED SODIUM AND POTASSIUM TO NIOBIUM OF GREATER THAN 8 TO 6, THE POTASSIUM ION CONSTITUTING AT LEAST ABOUT 50 MOL PERCENT OF THE TOTAL CONCENTRATION OF SODIUM ION AND POTASSIUM ION, WHEREBY MIXED ALKALI METAL NIOBATE CRYSTALLIZES FROM SOLUTION.
Claim 2
Dependent Claim
87 words
THE PROCESS FOR SEPARATING NIOBIUM AND TANTALUM FROM EACH OTHER WHICH COMPRISES PREPARING A NIOBATE-TANTALATE SOLUTION CONTAINING HYDROXIDE ION IN A CONCENTRATION OF AT LEAST ABOUT 0.01 MOLAR; ADDING SODIUM ION AND POTASSIUM ION TO SAID SOLUTION IN A CONCENTRATION SUFFICIENT TO PROVIDE A MOLAR RATIO OF COMBINED SODIUM AND POTASSIUM TO NIOBIUM OF GREATER THAN 8 TO 6, THE POTASSIUM ION CONSTITUTING AT LEAST ABOUT 50 MOL PERCENT OF THE TOTAL CONCENTRATION OF SODIUM ION AND POTASSIUM ION, WHEREBY MIXED ALKALI METAL NIOBATE CRYSTALLIZES FROM SOLUTION.
References Cited (Backward Citations)
US2976246A
Cited
US2758008A
Cited
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 |