US2956857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of decomposing complex uranium-rare earth tantalo-columbates
Assignee: Mallinckrodt Chemical Works
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Filing: 1957-11-25
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Granted: 1960-10-18
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Expires: 1977-11-25
Abstract
No abstract record available.
Inventors
- 👤 John R Ruhoff
- 👤 Charles O Gerfen
- 👤 George B Wills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:12
CPC Classifications
C; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0221; C22B60/0247; C22B3/00; C22B3/04; C22B34/00; C22B34/20; C22B34/24; C22B60/0226; C22B60/023; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
THE METHOD COMPRISING ADDING AN AQUEOUS SLURRY OF A FINELY MILLED URANIUM-RATE EARTH TANTALO-COLUMBATE TO AN AQUEOUS SODIUM HYDROXIDE SOLUTION HAVING A CONCENTRATION OF BETWEEN APPROXIMATELY 35%-80% BY WEIGHT, DIGESTING SAID MIXTURE AT A TEMPERATURE BETWEEN APPROXIMATELY 122*C. AND 220*C TO FORM A MIXTURE OF CAUSTIC LIQUOR AND A RESIDUE CONTAINING URANIUM, EARTH ACID AND RATE EARTH VALUES, SEPARATING SAID RESIDUE FROM THE CAUSTIC LIQUOR, ADDING HYDROCHLORIC ACID TO SAID RESIDUE TO FORM AN ACIDIFIED AQUEOUS MIXTURE HAVING A FREE ACID CONCENTRATION OF BETWEEN APPROXIMATELY 0.5-1.5 N, AND HEATING THE ACIDIFIED MIXTURE WHEREBY A SOLID CONCENTRATE OF THE EARTH ACID VALUES AND AN AQUEOUS CONCENTRATE OF URANIUM AND THE RARE EARTH VALUES ARE FORMED.
Claim 2
Independent Claim
114 words
THE METHOD COMPRISING ADDING AN AQUEOUS SLURRY OF A FINELY MILLED URANIUM-RATE EARTH TANTALO-COLUMBATE TO AN AQUEOUS SODIUM HYDROXIDE SOLUTION HAVING A CONCENTRATION OF BETWEEN APPROXIMATELY 35%-80% BY WEIGHT, DIGESTING SAID MIXTURE AT A TEMPERATURE BETWEEN APPROXIMATELY 122*C. AND 220*C TO FORM A MIXTURE OF CAUSTIC LIQUOR AND A RESIDUE CONTAINING URANIUM, EARTH ACID AND RATE EARTH VALUES, SEPARATING SAID RESIDUE FROM THE CAUSTIC LIQUOR, ADDING HYDROCHLORIC ACID TO SAID RESIDUE TO FORM AN ACIDIFIED AQUEOUS MIXTURE HAVING A FREE ACID CONCENTRATION OF BETWEEN APPROXIMATELY 0.5-1.5 N, AND HEATING THE ACIDIFIED MIXTURE WHEREBY A SOLID CONCENTRATE OF THE EARTH ACID VALUES AND AN AQUEOUS CONCENTRATE OF URANIUM AND THE RARE EARTH VALUES ARE FORMED.
References Cited (Backward Citations)
US2815264A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |