Patent US2905548A successfully refreshed from Google Patents.
US2905548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering tantalum and columbium
Assignee: Fansteel Inc
•
Filing: 1957-09-06
•
Granted: 1959-09-22
•
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 15:57
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.
References Cited (Backward Citations)
US2239277A
Cited
US1321684A
Cited
US324659A
Cited
GB536258A
Cited
US1022599A
Cited
US1042694A
Cited
US1373038A
Cited
US1648954A
Cited
US1644000A
Cited
US2031486A
Cited
US2030357A
Cited
US2183517A
Cited
US2205854A
Cited
US2241514A
Cited
US2296196A
Cited
US2516863A
Cited
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 |