US3773889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange process
Assignee: United States Department of the Interior
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Filing: 1971-06-30
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Granted: 1973-11-20
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Expires: 1991-06-30
Abstract
Abstract A METHOD FOR RECOVERING METALS FROM A SOLUTION OR SLURRY COMPRISING COUNTERCURRENTLY CONTACTING THE SOLUTION OR SLURRY WITH AN ION EXCHANGE RESIN COLUMN OPERATING ON THE SOLUTION UPFLOW PRINCIPLE. THE ION EXCHANGE RESIN COLUMN IS CHARACTERIZED BY SUBDIVISION INTO A SERIES OF MULTIPLE VERTICAL SECTIONS EACH SEPARATED FROM THE OTHER BY A ZONE OF REDUCED DIAMETER. THE METHOD OF THE INVENTION IS PARTICULARLY EFFECTIVE FOR RECOVERING URANIUM FROM SOLUTIONS OF LOW URANIUM CONTENT.
Inventors
- 👤 D George
- 👤 J Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:09
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/10; C; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0252; C22B60/0265
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |