US2962372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Columbium and tantalum separation
Assignee: Union Carbide Corp
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Filing: 1958-01-17
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Granted: 1960-11-29
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Expires: 1978-01-17
Abstract
No abstract record available.
Inventors
- 👤 Raymond A Foos
- 👤 Howard F Gemperline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:47
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
A PROCESS FOR COEXTRACTING COLUMBIUM AND TANTALUM VALUES FROM A SOURCE MATERIAL CONTAINING SAID METAL VALUES WHICH COMPRISES DISSOLVING SAID SOURCE MATERIAL IN SUFFICIENT AQUEOUS HYDROFLOURIC ACID SOLUTION TO PRODUCE AN AQUEOUS SOLUTION HAVING A HYDROFLUOURIC ACID CONCENTRATION OF AT LEAST 5.5 NORMAL IN EXCESS OF THAT JUST NECESSARY TO DISSOLVE SAID SOURCE MATERIAL, FURTHER ACIDIFYING SAID AQUEOUS ACID SOLUTION OF SAID SOURCE MATERIAL WITH A STRONG MINERAL ACID UNTIL THE HYDROGEN ION CONCENTRATION IS AT LEAST ABOUT 12 NORMAL IN EXCESS OF THE HYDROGEN ION CONCENTRATION OF THE SOLUTION OBTAINED BY DISSOLVING THE SOURCE MATERIAL IN A MINIMUM QUANTITY OF AQUEOUS HYDROFLUORIC ACID, INTIMATELY CONTACTING SAID FURTHER ACIDIFIED AQUEOUS ACID SOLUTION OF SAID SOURCE MATERIAL WITH AT LEAST ONE ORGANIC EXTRACTANT SELECTED FROM THE GROUP CONSISTING OF LOWER ALIPHATIC KETONES, LOWER ALIPHATIC ESTERS, AND LOWER ALIPHATIC ETHERS WHICH ARE SUBSTANTIALLY IMMISCIBLE WITH THE AQUEOUS ACID SOLUTION, WHEREBY DISSOLVED TANTALUM AND COLUMBIUM VALUES ARE TRANSFERRED TO THE ORGANIC EXTRACTANT, AND SEPARATING THE ORGANIC PHASE AND THE AQUEOUS PHASE FROM THE EACH OTHER.
Claim 2
Dependent Claim
172 words
A PROCESS FOR COEXTRACTING COLUMBIUM AND TANTALUM VALUES FROM A SOURCE MATERIAL CONTAINING SAID METAL VALUES WHICH COMPRISES DISSOLVING SAID SOURCE MATERIAL IN SUFFICIENT AQUEOUS HYDROFLOURIC ACID SOLUTION TO PRODUCE AN AQUEOUS SOLUTION HAVING A HYDROFLUOURIC ACID CONCENTRATION OF AT LEAST 5.5 NORMAL IN EXCESS OF THAT JUST NECESSARY TO DISSOLVE SAID SOURCE MATERIAL, FURTHER ACIDIFYING SAID AQUEOUS ACID SOLUTION OF SAID SOURCE MATERIAL WITH A STRONG MINERAL ACID UNTIL THE HYDROGEN ION CONCENTRATION IS AT LEAST ABOUT 12 NORMAL IN EXCESS OF THE HYDROGEN ION CONCENTRATION OF THE SOLUTION OBTAINED BY DISSOLVING THE SOURCE MATERIAL IN A MINIMUM QUANTITY OF AQUEOUS HYDROFLUORIC ACID, INTIMATELY CONTACTING SAID FURTHER ACIDIFIED AQUEOUS ACID SOLUTION OF SAID SOURCE MATERIAL WITH AT LEAST ONE ORGANIC EXTRACTANT SELECTED FROM THE GROUP CONSISTING OF LOWER ALIPHATIC KETONES, LOWER ALIPHATIC ESTERS, AND LOWER ALIPHATIC ETHERS WHICH ARE SUBSTANTIALLY IMMISCIBLE WITH THE AQUEOUS ACID SOLUTION, WHEREBY DISSOLVED TANTALUM AND COLUMBIUM VALUES ARE TRANSFERRED TO THE ORGANIC EXTRACTANT, AND SEPARATING THE ORGANIC PHASE AND THE AQUEOUS PHASE FROM THE EACH OTHER.
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) | 1963-11-29 | 1964-05-30 | 1964-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-29 | 1968-05-30 | 1968-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-29 | 1972-05-30 | 1972-11-29 | $7700.00 | Window Closed / Lapsed |