US2948668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodialysing apparatus with supported membranes
Assignee: Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
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Filing: 1958-11-03
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Granted: 1960-08-09
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Expires: 1978-11-03
Abstract
No abstract record available.
Inventors
- 👤 Whalley Christopher Hugh De
- 👤 Cornelis Van Hoek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:27
CPC Classifications
F; F16; F16K; F16K19/00; F16K19/003; B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/46; B01D61/50; B01D2313/00; B01D2313/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
IN A MULTICELL ELECTRODIALYZING APPARATUS COMPRISING A MEMBRANE STACK OF ALTERNATELY ARRANGED CATIONIC AND ANIONIC PERMSELECTIVE MEMBRANES, INSULATING SPACERS INTERPOSED BETWEEN SAID MEMBRANES TO GIVE A SERIES OF CONCENTRATION AND DEPLETION CELLS, MEANS FOR SUPPLYING. AND DISCHARGING LIQUIDS FROM SAID INDIVIDUAL CONCENTRATION AND DEPLETION CELLS AND MEANS OF SUPPLYING AN ELECTRIC CURRENT ACROSS SAID CONCENTRATION AND DEPLETION CELLS, THE IMPROVEMENT WHICH COMPRISES USING AS SAID INSULATING SPACER AN INTEGRAL SHEET OF SEMI-RIGID, PLASTIC, ELECTRICALLY-INSULATING, UNEXPANDED SPACED MATERIAL INCISED AND EXPANDED AT EACH INCISION TO PROVIDE SURFACES ON EACH SIDE OF THE SHEET SPACED FROM EACH OTHER BY A DISTANCE GREATER THAN ORIGINAL THICKNESS OF THE UNEXPANDED SHEET, SAID SURFACES BEING SEPARATED BY APERTURES APPROXIMATELY RHOMB-SPACED WITH ROUNDED OBTUSE ANGLES, THE PLANE OF THE MATERIAL BETWEEN EACH TWO ADJACENT OBTUSE ANGLES OF SAID RHOMBS BEING IN AN INCLINED POSITION WITH REGARD TO THE PLANE OF SAID SURFACES.
Claim 2
Dependent Claim
146 words
IN A MULTICELL ELECTRODIALYZING APPARATUS COMPRISING A MEMBRANE STACK OF ALTERNATELY ARRANGED CATIONIC AND ANIONIC PERMSELECTIVE MEMBRANES, INSULATING SPACERS INTERPOSED BETWEEN SAID MEMBRANES TO GIVE A SERIES OF CONCENTRATION AND DEPLETION CELLS, MEANS FOR SUPPLYING. AND DISCHARGING LIQUIDS FROM SAID INDIVIDUAL CONCENTRATION AND DEPLETION CELLS AND MEANS OF SUPPLYING AN ELECTRIC CURRENT ACROSS SAID CONCENTRATION AND DEPLETION CELLS, THE IMPROVEMENT WHICH COMPRISES USING AS SAID INSULATING SPACER AN INTEGRAL SHEET OF SEMI-RIGID, PLASTIC, ELECTRICALLY-INSULATING, UNEXPANDED SPACED MATERIAL INCISED AND EXPANDED AT EACH INCISION TO PROVIDE SURFACES ON EACH SIDE OF THE SHEET SPACED FROM EACH OTHER BY A DISTANCE GREATER THAN ORIGINAL THICKNESS OF THE UNEXPANDED SHEET, SAID SURFACES BEING SEPARATED BY APERTURES APPROXIMATELY RHOMB-SPACED WITH ROUNDED OBTUSE ANGLES, THE PLANE OF THE MATERIAL BETWEEN EACH TWO ADJACENT OBTUSE ANGLES OF SAID RHOMBS BEING IN AN INCLINED POSITION WITH REGARD TO THE PLANE OF SAID SURFACES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-09 | 1964-02-08 | 1964-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-09 | 1968-02-08 | 1968-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-09 | 1972-02-08 | 1972-08-09 | $7700.00 | Window Closed / Lapsed |