US2859099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the separation of columbium and tantalum values
Assignee: Mallinckrodt Chemical Works
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Filing: 1955-02-15
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Granted: 1958-11-04
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Expires: 1975-02-15
Abstract
No abstract record available.
Inventors
- 👤 John R Ruhoff
- 👤 George L Martin
- 👤 Charles O Gerfen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:17
CPC Classifications
C; C01; C01G; C01G35/00; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
THE METHOD OF RECOVERING TANTALUM VALUES FROM A CONCENTRATE CONTAINING COMPOUNDS OF TANTALUM AND COLUMBIUM, COMPRISING ADDING THE HYDROUS OXIDE OF COLUMBIUM TO AN AQUEOUS SOLUTION OF SAID CONCENTRATE CONTAINING THE FLUOCOMPLEXES OF COLUMBIUM AND TANTALUM WHILE MAINTAINING THE PH AT A VALUE BETWEEN APPROXIMATELY 2-6 TO EFFECT PRECIPITATION OF HYDROUS TANTALUM OXIDE.
Claim 2
Independent Claim
53 words
THE METHOD OF RECOVERING TANTALUM VALUES FROM A CONCENTRATE CONTAINING COMPOUNDS OF TANTALUM AND COLUMBIUM, COMPRISING ADDING THE HYDROUS OXIDE OF COLUMBIUM TO AN AQUEOUS SOLUTION OF SAID CONCENTRATE CONTAINING THE FLUOCOMPLEXES OF COLUMBIUM AND TANTALUM WHILE MAINTAINING THE PH AT A VALUE BETWEEN APPROXIMATELY 2-6 TO EFFECT PRECIPITATION OF HYDROUS TANTALUM OXIDE.
References Cited (Backward Citations)
US1802242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-03 | 1962-05-05 | 1962-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-03 | 1966-05-05 | 1966-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-03 | 1970-05-05 | 1970-11-04 | $7700.00 | Window Closed / Lapsed |