US3697410A
Expired / Lapsed
US
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Electrodialysis demineralization apparatus
Assignee: CCI Aerospace Corp
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Filing: 1971-02-08
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Granted: 1972-10-10
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Expires: 1991-02-08
Abstract
Abstract AN APPARATUS TO EFFECT DEMINERALIZATION OF WATER BY THE PROCESS OF ELECTRODIALYSIS WHEREIN AN ION EXCHANGE MEMBRANE AND A SALT STORAGE ELEMENT ARE LOCATED IN A CROSS SECTIONAL SPIRAL CONFIGURATION, THE WATER TO BE DEMINERALIZED BY PASSING THROUGH THE APPARATUS ALSO IN A CROSS SECTIONAL SPIRAL CONFIGURATION.
Inventors
- 👤 Allan M Johnson
- 👤 Richard F Gilman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:39
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/46; B01D61/461; B01D63/00; B01D63/06; B01D63/062
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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |