Patent US2842424A successfully refreshed from Google Patents.
US2842424A
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Process for separating niobium and tantalum from materials containing these metals
Assignee: BASF Schweiz AG
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Filing: 1956-02-24
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Granted: 1958-07-08
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Expires: 1976-02-24
Abstract
No abstract record available.
Inventors
- 👤 Schornstein Waldemar
- 👤 Kern Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:11
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
PROCESS FOR SEPARATING NIOBIUM AND TANTALUM FROM ONE ANOTHER, WHEREIN IN A MIXTURE CONTAINING TANTALUM PENTACHLORIDE AND NIOBIUM OXYCHLORIDE THE TANTALUM PENTACHLORIDE IS DISSOLVED IN AN ANHYDROUS SOLVENT SELEKCTED FROM THE GROUP CONSISTING OF THIONYL CHLORIDE, SULFURYL CHLORIDE AND SULFUR DIOXIDE, AND THE RESULTING SOLUTION IS SEPARATED FROM THE UNDISSOLVED FRACTION OF THE STARTING MIXTURE.
Claim 2
Dependent Claim
55 words
PROCESS FOR SEPARATING NIOBIUM AND TANTALUM FROM ONE ANOTHER, WHEREIN IN A MIXTURE CONTAINING TANTALUM PENTACHLORIDE AND NIOBIUM OXYCHLORIDE THE TANTALUM PENTACHLORIDE IS DISSOLVED IN AN ANHYDROUS SOLVENT SELEKCTED FROM THE GROUP CONSISTING OF THIONYL CHLORIDE, SULFURYL CHLORIDE AND SULFUR DIOXIDE, AND THE RESULTING SOLUTION IS SEPARATED FROM THE UNDISSOLVED FRACTION OF THE STARTING MIXTURE.
References Cited (Backward Citations)
GB507124A
Cited
US2443254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-07 | 1962-01-06 | 1962-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-07 | 1966-01-06 | 1966-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-07 | 1970-01-06 | 1970-07-08 | $7700.00 | Window Closed / Lapsed |