US3725235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamically formed electrodialysis membranes
Assignee: INTERIOR
•
Filing: 1971-03-23
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Granted: 1973-04-03
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Expires: 1991-03-23
Abstract
Abstract ELECTRODIALYSIS MEMBRANES ARE FORMED IN SITU BY CONTACTING AN AQUEOUS SUSPENSION OF AN ION EXCHANGE RESIN WITH A SUPPORT MATERIAL PRIOR TO APPLICATION OF AN ELECTRICAL POTENTIAL ACROSS THE SEPARATION UNIT.
Inventors
- 👤 M Mintz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:18
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D67/00; B01D67/0081; B01D67/0088; B01D69/00; B01D69/12; B01D69/1216; B01D69/14; B01D71/00; B01D71/06; B01D71/28; B01D71/281; B01D2321/00; B01D2321/16; B01D2321/168
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |