US2819945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of separating values of columbium and/or tantalum from a concentrate also containing an element of group iv b
Assignee: Mallinckrodt Chemical Works
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Filing: 1955-02-15
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Granted: 1958-01-14
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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
2026-11-02 18:28
CPC Classifications
C; C01; C01G; C01G33/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
THE METHOD OF SEPARATING VALUES OF AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF COLUMBIUM AND TANTALUM FROM A CONCENTRATE SOLUTION IN WHICH AT LEAST ONE OF THESE VALUES AND AN ELEMENT OF GROUP IV B OF THE PERIODIC TABLE ARE PRESENT AS THEIR FLUOCOMPLEXES, COMPRISING ADDING A BASE SELECTED FROM THE GROUP CONSISTING OF AMMONIUM HYDROXIDE, SODIUM HYDROXIDE AND POTASSIUM HYDROXIDE TO SAID SOLUTION TO PRECIPITATE THE HYDROUS OXIDE OF AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF COLUMBIUM AND TANTALUM FROM THE SOLUTION CONTAINING OF SAID GROUP IV B ELEMENT.
Claim 2
Independent Claim
96 words
THE METHOD OF SEPARATING VALUES OF AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF COLUMBIUM AND TANTALUM FROM A CONCENTRATE SOLUTION IN WHICH AT LEAST ONE OF THESE VALUES AND AN ELEMENT OF GROUP IV B OF THE PERIODIC TABLE ARE PRESENT AS THEIR FLUOCOMPLEXES, COMPRISING ADDING A BASE SELECTED FROM THE GROUP CONSISTING OF AMMONIUM HYDROXIDE, SODIUM HYDROXIDE AND POTASSIUM HYDROXIDE TO SAID SOLUTION TO PRECIPITATE THE HYDROUS OXIDE OF AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF COLUMBIUM AND TANTALUM FROM THE SOLUTION CONTAINING OF SAID GROUP IV B ELEMENT.
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) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |