US2905550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of 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
2026-10-26 22:51
CPC Classifications
C; C22; C22B; C22B34/00; C22B5/00; C22B5/02; C22B5/04; C22B5/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
76 words
THE METHOD OF RECOVERING A METAL SELECTED FROM THE GROUP CONSISTING OF TANTALUM, COLUMBIUM, MOLYBDENUM AND TUNGSTEN FROM AN ALLOY OF THE SELECTED METAL AND ALUMINUM, COMPRISING HEATING THE SAID ALUMINUM ALLOY WITH COPPER CHLORIDE TO FORM A MIX OF COPPER AND THE SELECTED METAL IN A FINELY DIVIDED STATE, THE COPPER BEING CAPABLE OF DISSOLVING ALUMINUM AND INCAPABLE OF DISSOLVING THE SELECTED METAL, AND SEPARATING THE SELECTED METAL FROM THE FINELY DIVIDED COPPER-SELECTED METAL MIX.
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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 |