US2905548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering tantalum and columbium
Assignee: Fansteel Inc
•
Filing: 1957-09-06
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Granted: 1959-09-22
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Expires: 1977-09-06
Abstract
No abstract record available.
Inventors
- 👤 Donald F Taylor
- 👤 Robert L Baughman
- 👤 Leonard F Yntema
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:57
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/24; C22B5/00; C22B5/02; C22B5/04; C22B5/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
IN THE RECOVERY OF A METAL SELECTED FROM THE GROUP CONSISTING OF TANTALUM AND COLUMBIUM THE METHOD WHICH COMPRISES: HEATING AN INORGANIC COMPOUND OF THE SELECTED METAL WITH AN ALLOY OF ALUMINUM INCLUDUNG A THIRD METAL, SAID COMPOUND BEING SUBSTANTIALLY COMPLETELY REDUCIBLE TO THE METAL STATE IN MOLTEN ALUMINUM, SAID THIRD METAL BEING PRESENT IN A SUFFICIENT QUANTITY TO DISSOLVE SUBSTANTIALLY ALL OF THE ALUMINUM AND BEING INCAPABLE OF DISSOLVING THE SELECTED METAL AND HAVING A LOWER MELTING POINT THAN THE SELECTED METAL, TO FORM A REACTION MIXTURE INCLUDING SAID SELECTED METAL IN A FINELY DIVIDED, SUBSTANTIALLY PURE STATE; AND SEPARATING THE SELECTED METAL FROM THE MIXTURE.
Claim 2
Dependent Claim
107 words
IN THE RECOVERY OF A METAL SELECTED FROM THE GROUP CONSISTING OF TANTALUM AND COLUMBIUM THE METHOD WHICH COMPRISES: HEATING AN INORGANIC COMPOUND OF THE SELECTED METAL WITH AN ALLOY OF ALUMINUM INCLUDUNG A THIRD METAL, SAID COMPOUND BEING SUBSTANTIALLY COMPLETELY REDUCIBLE TO THE METAL STATE IN MOLTEN ALUMINUM, SAID THIRD METAL BEING PRESENT IN A SUFFICIENT QUANTITY TO DISSOLVE SUBSTANTIALLY ALL OF THE ALUMINUM AND BEING INCAPABLE OF DISSOLVING THE SELECTED METAL AND HAVING A LOWER MELTING POINT THAN THE SELECTED METAL, TO FORM A REACTION MIXTURE INCLUDING SAID SELECTED METAL IN A FINELY DIVIDED, SUBSTANTIALLY PURE STATE; AND SEPARATING THE SELECTED METAL FROM THE MIXTURE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |