US3718583A
Expired / Lapsed
US
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Method for the concentration of heavy metal cations using ion selective membranes
Assignee: United States Atomic Energy Commission
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Filing: 1971-11-29
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Granted: 1973-02-27
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Expires: 1991-11-29
Abstract
Abstract D R A W I N G THE CONCENTRATION OF HEAVY METAL CATIONS, SUCH AS URANYL OR PULTONIUM CATIONS, FROM IONIC SOLUTIONS SEPARATED BY AN ION SELECTIVE MEMBRANE, WHEREIN THE DIFFERENCE IN CHEMICAL POTENTIALS OF THE VARIOUS ION SPECIES PROVIDE THE DRIVING FORCE TO EFFECT A TRANSFER ACROSS THE MEMBRANE, IS ENHANCED BY SEPARATING A PORTION OF THE EXTRACT SOLUTION BEING CONCENTRATION IS HEAVY METAL CATION PRODUCT AND RECIRCULATING THAT PORTION ALONG WITH THE INITIAL STRIP SOLUTION INTO CONTACT WITH THE MEMBRANE. THE PREFERRED RATIO OF THE RECIRCULATING PORTION TO THE INITIAL STRIP SOLUTION IS BETWEEN ABOUT 1 TO 1 AND 5 TO 1.
Inventors
- 👤 J Wu
- 👤 B Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:55
CPC Classifications
C; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0252; C22B60/0265; B; B01; B01D; B01D61/00; B01D61/24; B01D61/246; B01D61/2461; B01J; B01J47/00; B01J47/12
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References Cited (Backward Citations)
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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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |