US3645884A
Expired / Lapsed
US
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Electrolytic ion exchange apparatus
Assignee: EDWIN R GILLILAND
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Filing: 1969-07-10
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Granted: 1972-02-29
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Expires: 1989-07-10
Abstract
Abstract THE INVENTION IS DIRECTED TO AN ION-SELECTIVE MEMBRANEELECTRODIALYSIS APPARATUS EMPLOYING A FILLER OF ION-EXCHANGE RESIN IN CERTAIN CHAMBERS OF SAID APPARATUS FOR THE PURPOSE OF DEIONIZING SOLUTIONS WHILE SIMULTANEOUSLY ELECTROLYTICALLY REGENERATING SAID ION-EXHANGE MATERIAL.
Inventors
- 👤 Edwin R Gilliland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:15
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/46; B01D61/48; B01J; B01J47/00; B01J47/02; B01J47/06; B01J47/08
Claims Analysis
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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) | 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 |