Patent US3645922A successfully refreshed from Google Patents.
US3645922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion-exchange resins
Assignee: Commonwealth Scientific and Industrial Research Organisation
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Filing: 1968-11-22
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Granted: 1972-02-29
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Expires: 1988-11-22
Abstract
Abstract COMPOSITE ION EXCHANGE ADSORBENT IN PARTICULATE FORM COMPRISING PARTICULATE ACIDIC AND BASIC ION EXCHANGE MATERIALS DISPERSED IN A HOMOGENEOUS MATRIX OF A WATER INSOLUBLE AND ION-PERMEABLE POLYMERIC MATERIAL, PREFERABLY POLY (VINYL ALCHOL). SUCH ADSORBENTS MAY BE MADE BY DISPERSING THE ION EXCHANGE MATERIALS IN A SOLUTION OF THE POLYMERIC MATERIAL IN A SOLVENT, DISPERSING THE DISPERSION IN A MEDIUM IMMISCIBLE WITH THE SOLUTION, AND REMOVING AT LEAST A PART OF THE SOLVENT. THE ADSORBENT IS PARTICULARLY SUITABLE FOR USE IN THE DEMINERALISATION OF SALT SOLUTIONS.
Inventors
- 👤 Donald Eric Weiss
- 👤 Brian Alfred Bolto
- 👤 Donald Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:35
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/018
Claims Analysis
Total Claims: 0
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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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |