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Patent US2859098A successfully refreshed from Google Patents.
US2859098A
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Process for the separation of columbium, tantalum, and titanium 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
2026-10-29 20:27
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1236; C22B34/1259
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
THE METHOD OF RECOVERING COLUMBIUM AND TANTALUM VALUES FROM A CONCENTRATE CONTAINING COMPOUNDS OF SAID ELEMENTS AND AN ELEMENT OF GROUP IV B OF THE PERIODIC TABLE, COMPRISING ADDING THE HYDROUS OXIDE OF A GROUP IV B ELEMENT TO A SOLUTION OF SAID CONCENTRATE CONTAINING THE FLUOCOMPLEXES OF COLUMBIUM, TANTALUM AND THE GROUP IV B ELEMENT WHILE MAINTAINING THE PH AT A VALUE BETWEEN APPROXIMATELY 2-7 TO PRECIPITATE HYDROUS OXIDES OF COLUMBIUM AND TANTALUM.
Claim 2
Independent Claim
74 words
THE METHOD OF RECOVERING COLUMBIUM AND TANTALUM VALUES FROM A CONCENTRATE CONTAINING COMPOUNDS OF SAID ELEMENTS AND AN ELEMENT OF GROUP IV B OF THE PERIODIC TABLE, COMPRISING ADDING THE HYDROUS OXIDE OF A GROUP IV B ELEMENT TO A SOLUTION OF SAID CONCENTRATE CONTAINING THE FLUOCOMPLEXES OF COLUMBIUM, TANTALUM AND THE GROUP IV B ELEMENT WHILE MAINTAINING THE PH AT A VALUE BETWEEN APPROXIMATELY 2-7 TO PRECIPITATE HYDROUS OXIDES OF COLUMBIUM AND TANTALUM.
References Cited (Backward Citations)
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 |