US2905549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering refractory metals
Assignee: Fansteel Inc
•
Filing: 1957-10-14
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Granted: 1959-09-22
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Expires: 1977-10-14
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
2026-10-30 03:08
CPC Classifications
C; C22; C22B; C22B34/00; C22B5/00; C22B5/02; C22B5/04; C22B5/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
THE METHOD OF SEPARATING A METAL SELECTED FROM THE GROUP CONSISTING OF TANTALUM, TUNGSTEN, MOLYBDENUM AND COLUMBIUM FROM AN ALLOY OF THE SELECTED METAL AND ALUMINUM, COMPRISING: ADDING THE SAID ALLOY TO A MOLTEN MASS OF LOW MELTING POINT THIRD METAL CAPABLE OF DISSOLVING THE ALUMINUM OF THE ALLOY AND OF FORMING ANALLOY WITH THE ALUMINUM AND IN WHICH THE SELECTED METAL IS SUBSTANTIALLY INSOLUBLE TO FORM AN ALLOY OF THE ALUMINUM AND THE THIRD METAL; AND SEPARATING THE SELECTED METAL FROM THE SAID ALUMINUM-THIRD METAL ALLOY.
Claim 2
Independent Claim
87 words
THE METHOD OF SEPARATING A METAL SELECTED FROM THE GROUP CONSISTING OF TANTALUM, TUNGSTEN, MOLYBDENUM AND COLUMBIUM FROM AN ALLOY OF THE SELECTED METAL AND ALUMINUM, COMPRISING: ADDING THE SAID ALLOY TO A MOLTEN MASS OF LOW MELTING POINT THIRD METAL CAPABLE OF DISSOLVING THE ALUMINUM OF THE ALLOY AND OF FORMING ANALLOY WITH THE ALUMINUM AND IN WHICH THE SELECTED METAL IS SUBSTANTIALLY INSOLUBLE TO FORM AN ALLOY OF THE ALUMINUM AND THE THIRD METAL; AND SEPARATING THE SELECTED METAL FROM THE SAID ALUMINUM-THIRD METAL ALLOY.
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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 |