US2795481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction process for the separation of tantalum and niobium values
Assignee: Individual
•
Filing: 1953-11-13
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Granted: 1957-06-11
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Expires: 1973-11-13
Abstract
No abstract record available.
Inventors
- 👤 Harry G Hicks
- 👤 Walter E Nervik
- 👤 Peter C Stevenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:34
CPC Classifications
C; C01; C01G; C01G33/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
99 words
A METHOD FOR SEPARATING NIOBIUM AND TANTALUM VALUES COMPRISING PRODUCING A SOLUTION OF SAID VALUES IN A MIXTURE OF HYDROFLUORIC ACID AND A MINERAL ACID SELECTED FROM THE GROUP CONSISTING OF SULFURIC, NITRIC, HYDROCHLORIC AND PERCHLORIC WHEREIN SAID VALUES EXIST IN A PENTAVALENT OXIDATION STATE; CONTACTING THE SOLUTION WITH DIISOPROPYL KETONE; SEPARATING THE KETONE PHASE FROM THE AQUEOUS PHASE; RECOVERING THE NIOBIUM FROM THE AQUEOUS PHASE BY TREATING SUCH PHASE WITH BORIC ACID AND AMMONIUM HYDROXIDE TO PRECIPITATE NIOBIUM OXIDE THEREFROM SEPARATING THE NIOBIUM OXIDE FROM THE AQUEOUS PHASE; WASHING THE OXIDE WITH 4.0M NITRIC ACID AND THEN WITH
Claim 2
Independent Claim
99 words
A METHOD FOR SEPARATING NIOBIUM AND TANTALUM VALUES COMPRISING PRODUCING A SOLUTION OF SAID VALUES IN A MIXTURE OF HYDROFLUORIC ACID AND A MINERAL ACID SELECTED FROM THE GROUP CONSISTING OF SULFURIC, NITRIC, HYDROCHLORIC AND PERCHLORIC WHEREIN SAID VALUES EXIST IN A PENTAVALENT OXIDATION STATE; CONTACTING THE SOLUTION WITH DIISOPROPYL KETONE; SEPARATING THE KETONE PHASE FROM THE AQUEOUS PHASE; RECOVERING THE NIOBIUM FROM THE AQUEOUS PHASE BY TREATING SUCH PHASE WITH BORIC ACID AND AMMONIUM HYDROXIDE TO PRECIPITATE NIOBIUM OXIDE THEREFROM SEPARATING THE NIOBIUM OXIDE FROM THE AQUEOUS PHASE; WASHING THE OXIDE WITH 4.0M NITRIC ACID AND THEN WITH
Claim 3
Dependent Claim
59 words
0 M HYDROCHLORIC ACID; AND RECOVERING THE TANTALUM FROM THE KETONE PHASE BY BACK-EXTRACTING THE TANTALUM INTO WATER FROM THE DIISOPROPYL KENTONE, TREATING THE AQUEOUS EXTRACT WITH BORIC ACID AND AMMONIUM HYDROXIDE TO PRECIPITATE TANTALUM ODICE THEREFROM SEPARATING THE TANTALUM OXIDE FROM THE EXTRACT, WASHING THE OXIDE WITH 4.0 M NITRIC ACID, AND THEN WITH 4.0 M HYDROCHLORIC ACID.
Claim 4
Dependent Claim
59 words
0 M HYDROCHLORIC ACID; AND RECOVERING THE TANTALUM FROM THE KETONE PHASE BY BACK-EXTRACTING THE TANTALUM INTO WATER FROM THE DIISOPROPYL KENTONE, TREATING THE AQUEOUS EXTRACT WITH BORIC ACID AND AMMONIUM HYDROXIDE TO PRECIPITATE TANTALUM ODICE THEREFROM SEPARATING THE TANTALUM OXIDE FROM THE EXTRACT, WASHING THE OXIDE WITH 4.0 M NITRIC ACID, AND THEN WITH 4.0 M HYDROCHLORIC ACID.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-10 | 1960-12-10 | 1961-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-10 | 1964-12-10 | 1965-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-10 | 1968-12-10 | 1969-06-11 | $7700.00 | Window Closed / Lapsed |