US3061407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of columbite and related minerals
Assignee: National Research Development Corp UK
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Filing: 1959-09-02
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Granted: 1962-10-30
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Expires: 1979-09-02
Abstract
No abstract record available.
Inventors
- 👤 Burkin Alfred Richard
- 👤 Meddings Basil
- 👤 Sawyer Hugh David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:16
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PROCESS FOR DECOMPOSING A MINERAL SELECTED FROM THE GROUP CONSISTING OF COLUMBITES AND TANTALO-COLUMBITES HAVING A WEIGHT RATIO OF NIOBIUM TO TANTALUM OF AT LEAST ABOUT 1:4, WHICH COMPRISES LEACHING SAID MINERAL IN FINELY DIVIDED FORM WITH AN AQUEOUS CAUSTIC POTASH SOLUTION CONTAINING BETWEEN ABOUT 5 AND ABOUT 50% BY WEIGHT KOH IN THE PRESENCE OF AN ADDED OXIDIZING AGENT IN CONTACT WITH THE MINERAL AND THE LEACHING SOLUTION AT A TEMPERATURE BETWEEN ABOUT 300 AND 100*C, WHILE MAINTAINING LIQUID LEACHING SOLUTION IN CONTACT WITH SAID MINERAL TO THEREBY SOLUBILIZE NIOBIUM AND TANTALUM VALUES.
Claim 2
Dependent Claim
95 words
A PROCESS FOR DECOMPOSING A MINERAL SELECTED FROM THE GROUP CONSISTING OF COLUMBITES AND TANTALO-COLUMBITES HAVING A WEIGHT RATIO OF NIOBIUM TO TANTALUM OF AT LEAST ABOUT 1:4, WHICH COMPRISES LEACHING SAID MINERAL IN FINELY DIVIDED FORM WITH AN AQUEOUS CAUSTIC POTASH SOLUTION CONTAINING BETWEEN ABOUT 5 AND ABOUT 50% BY WEIGHT KOH IN THE PRESENCE OF AN ADDED OXIDIZING AGENT IN CONTACT WITH THE MINERAL AND THE LEACHING SOLUTION AT A TEMPERATURE BETWEEN ABOUT 300 AND 100*C, WHILE MAINTAINING LIQUID LEACHING SOLUTION IN CONTACT WITH SAID MINERAL TO THEREBY SOLUBILIZE NIOBIUM AND TANTALUM VALUES.
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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) | 1965-10-29 | 1966-04-30 | 1966-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-29 | 1970-04-30 | 1970-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-29 | 1974-04-30 | 1974-10-30 | $7700.00 | Window Closed / Lapsed |