US2767047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of separating tantalum and niobium values from each other
Assignee: Individual
•
Filing: 1953-10-20
•
Granted: 1956-10-16
•
Expires: 1973-10-20
Abstract
No abstract record available.
Inventors
- 👤 Harley A Wilhelm
- 👤 James V Kerrigan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:53
CPC Classifications
C; C01; C01G; C01G35/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS OF SEPARATING TANTALUM VALUES FROM NIOBIUM VALUES FROM A MIXTURE THEREOF, COMPRISING PREPARING AN AQUEOUS MINERAL ACID SOLUTION OF THE FLUORIDES OF SAID VALUES, CONTACTING SAID AQUEOUS SOLUTION AT ROOM TEMPERTURE WITH A SUBSTANTIALLY WATER-IMMISCIBLE ORGANIC OXYGEN-CONTAINING SOLVENT CONTAINING AT LEAST 5 CARBON ATOMS AND BEING SELECTED FROM THE GROUP CONSISTING OF TRIBUTYL PHOSPHATE, ISO-AMYL ALCOHOL, SEC.-AMYL ALCOHOL, METHYL-N-HEXYL CARBINOL, MESITYL OXIDE, DIISOPROPYL KETONE, CYCLOHEXANONE, AND ISOPHORONE, AND SEPARATING AN ORGANIC PREFERENTIALLY TANTALUM-CONTAINING PHASE FROM AN AQUEOUS NIOBIUM-CONTAINING PHASE.
Claim 2
Dependent Claim
81 words
A PROCESS OF SEPARATING TANTALUM VALUES FROM NIOBIUM VALUES FROM A MIXTURE THEREOF, COMPRISING PREPARING AN AQUEOUS MINERAL ACID SOLUTION OF THE FLUORIDES OF SAID VALUES, CONTACTING SAID AQUEOUS SOLUTION AT ROOM TEMPERTURE WITH A SUBSTANTIALLY WATER-IMMISCIBLE ORGANIC OXYGEN-CONTAINING SOLVENT CONTAINING AT LEAST 5 CARBON ATOMS AND BEING SELECTED FROM THE GROUP CONSISTING OF TRIBUTYL PHOSPHATE, ISO-AMYL ALCOHOL, SEC.-AMYL ALCOHOL, METHYL-N-HEXYL CARBINOL, MESITYL OXIDE, DIISOPROPYL KETONE, CYCLOHEXANONE, AND ISOPHORONE, AND SEPARATING AN ORGANIC PREFERENTIALLY TANTALUM-CONTAINING PHASE FROM AN AQUEOUS NIOBIUM-CONTAINING PHASE.
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) | 1959-10-16 | 1960-04-16 | 1960-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-16 | 1964-04-16 | 1964-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-16 | 1968-04-16 | 1968-10-16 | $7700.00 | Window Closed / Lapsed |