US2950966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of tantalum values
Assignee: Millennium Petrochemicals Inc
•
Filing: 1958-06-20
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Granted: 1960-08-30
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Expires: 1978-06-20
Abstract
No abstract record available.
Inventors
- 👤 Raymond A Foos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:33
CPC Classifications
C; C01; C01G; C01G35/00; C01G35/003; C01G33/00; C01G33/003; C22; C22B; C22B34/00; C22B34/20; C22B34/24; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A PROCESS FOR RECOVERING TANTALUM VALUES FROM TANTALUM-CONTAINING MATERIAL WHICH COMPRISES (A) REACTING SAID TANTALUM-CONTAINING MATERIAL WITH A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, POTASSIUM HYDROXIDE, SODIUM CARBONATE, SULFURIC ACID, AND HYDROFLUORIC ACID, (B) LEACHING THE RESULTING REACTION MIXTURE WITH WATER TO REMOVE WATER-SOLUBLE MATERIALS (C) LEACHING THE WATER-LEACHED REACTION MIXTURE WITH AN ACID SELECTED FROM THE GROUP CONSISTING OF NITRIC, HYDROCHLORIC AND SULFURIC TO REMOVE ACID SOLUBLE IMPURITIES (D) REACTING SAID LEACHED REACTION MIXTURE WITH HYDROFLUORIC ACID TO OBTAIN A MIXTURE COMPRISING FLUOCOMPLEXES OF TANTALUM AND COLUMBIUM IN ACCORDANCE WITH THE FOLLOWING REACTIONS:
Claim 2
Dependent Claim
97 words
A PROCESS FOR RECOVERING TANTALUM VALUES FROM TANTALUM-CONTAINING MATERIAL WHICH COMPRISES (A) REACTING SAID TANTALUM-CONTAINING MATERIAL WITH A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, POTASSIUM HYDROXIDE, SODIUM CARBONATE, SULFURIC ACID, AND HYDROFLUORIC ACID, (B) LEACHING THE RESULTING REACTION MIXTURE WITH WATER TO REMOVE WATER-SOLUBLE MATERIALS (C) LEACHING THE WATER-LEACHED REACTION MIXTURE WITH AN ACID SELECTED FROM THE GROUP CONSISTING OF NITRIC, HYDROCHLORIC AND SULFURIC TO REMOVE ACID SOLUBLE IMPURITIES (D) REACTING SAID LEACHED REACTION MIXTURE WITH HYDROFLUORIC ACID TO OBTAIN A MIXTURE COMPRISING FLUOCOMPLEXES OF TANTALUM AND COLUMBIUM IN ACCORDANCE WITH THE FOLLOWING REACTIONS:
References Cited (Backward Citations)
US2795481A
Cited
US2773737A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-30 | 1964-02-29 | 1964-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-30 | 1968-02-29 | 1968-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-30 | 1972-02-29 | 1972-08-30 | $7700.00 | Window Closed / Lapsed |