US2974007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of niobium and/or tantalum from mixtures of their pentahalides
Assignee: BASF Schweiz AG
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Filing: 1957-11-08
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Granted: 1961-03-07
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Expires: 1977-11-08
Abstract
No abstract record available.
Inventors
- 👤 Scheller Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:09
CPC Classifications
C; C01; C01G; C01G33/00; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A PROCESS FOR THE SEPARATION OF NIOBIUM AND TANTALUM VALUES FROM MIXTURES OF THEIR PENTACHLORIDES COMPRISING THE STEPS OF REACTING UNDER ANHYDROUS AND OXYGENFREE CONDITIONS A MIXTURE OF SUCH PENTACHLORIDES WITH A METAL HALIDE, THE METAL BEING A MEMBER SELECTED FROM THE GROUP CONSISTING OF AN ALKALI METAL AND AN ALKALINE EARTH METAL AND SAID METAL ION HAVING A DIAMETER LARGER THAN THAT OF THE SODIUM ION, AND THEREBY SELECTIVELY FORMING A DOUBLE SALT WITH THE TANTALUM-CONTAINING DOUBLE SALT TION, AND SEPARATING THE TANTALUM-CONTAINING DOUBLE SALT FROM THE MIXTURE THEREBY ENRICHED IN NIOBIUM.
Claim 2
Dependent Claim
93 words
A PROCESS FOR THE SEPARATION OF NIOBIUM AND TANTALUM VALUES FROM MIXTURES OF THEIR PENTACHLORIDES COMPRISING THE STEPS OF REACTING UNDER ANHYDROUS AND OXYGENFREE CONDITIONS A MIXTURE OF SUCH PENTACHLORIDES WITH A METAL HALIDE, THE METAL BEING A MEMBER SELECTED FROM THE GROUP CONSISTING OF AN ALKALI METAL AND AN ALKALINE EARTH METAL AND SAID METAL ION HAVING A DIAMETER LARGER THAN THAT OF THE SODIUM ION, AND THEREBY SELECTIVELY FORMING A DOUBLE SALT WITH THE TANTALUM-CONTAINING DOUBLE SALT TION, AND SEPARATING THE TANTALUM-CONTAINING DOUBLE SALT FROM THE MIXTURE THEREBY ENRICHED IN NIOBIUM.
References Cited (Backward Citations)
US2816816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-06 | 1964-09-05 | 1965-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-06 | 1968-09-05 | 1969-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-06 | 1972-09-05 | 1973-03-07 | $7700.00 | Window Closed / Lapsed |