US3073774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodialytic cells
Assignee: Individual
•
Filing: 1961-08-10
•
Granted: 1963-01-15
•
Expires: 1981-08-10
Abstract
No abstract record available.
Inventors
- 👤 William J Roberts
- 👤 Rogers Albert William John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:29
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/46; B01D61/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
IN AN ELECTRODIALYTIC CELL COMPRISING A STACK OF IONPERMEABLE MEMBRANES SEPARATED BY HOLLOW FRAME-LIKE SPACERS, THE OPEN CENTRES OF WHICH FORM COMPARTMENTS WHICH ARE BOUNDED ON THEIR MAJOR FACES BY THE MEMBRANES, AND FILLERS OF A PLASTIC IN SAID COMPARTMENTS FOR MAINTAINING THE MEMBRANES AT PROPER SPACING, THE IMPROVEMENT IN WHICH THE SAID FILLERS ARE UNITARY SHEETS RESEMBLING WOVEN FABRIC IN WHICH THE EQUIVALENT OF THE WEFT AND WARP THREADS DO NOT INTERLACE BUT FORM TWO LAYERS WITH EACH WEFT THREAD IN CONTACT WITH AND UNITED TO EACH WARP THREAD THAT IT CROSSES.
Claim 2
Dependent Claim
93 words
IN AN ELECTRODIALYTIC CELL COMPRISING A STACK OF IONPERMEABLE MEMBRANES SEPARATED BY HOLLOW FRAME-LIKE SPACERS, THE OPEN CENTRES OF WHICH FORM COMPARTMENTS WHICH ARE BOUNDED ON THEIR MAJOR FACES BY THE MEMBRANES, AND FILLERS OF A PLASTIC IN SAID COMPARTMENTS FOR MAINTAINING THE MEMBRANES AT PROPER SPACING, THE IMPROVEMENT IN WHICH THE SAID FILLERS ARE UNITARY SHEETS RESEMBLING WOVEN FABRIC IN WHICH THE EQUIVALENT OF THE WEFT AND WARP THREADS DO NOT INTERLACE BUT FORM TWO LAYERS WITH EACH WEFT THREAD IN CONTACT WITH AND UNITED TO EACH WARP THREAD THAT IT CROSSES.
References Cited (Backward Citations)
US2758083A
Cited
US2919467A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |