Patent US3061407A successfully refreshed from Google Patents.
US3061407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of columbite and related minerals
Assignee: National Research Development Corp UK
•
Filing: 1959-09-02
•
Granted: 1962-10-30
•
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 22:16
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.
References Cited (Backward Citations)
US664488A
Cited
US2086570A
Cited
US2187750A
Cited
US2773737A
Cited
US2819945A
Cited
US2974014A
Cited
GB805501A
Cited
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 |