Patent US2894894A successfully refreshed from Google Patents.
US2894894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic cells
Assignee: Individual
•
Filing: 1958-03-19
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Granted: 1959-07-14
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Expires: 1978-03-19
Abstract
No abstract record available.
Inventors
- 👤 Kressman Theodore Roger Ernest
- 👤 Tye Frank Laurence
- 👤 Bott Hugh Randall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:45
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/52; B01D61/46; B01D61/50; B01D2313/00; B01D2313/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
AN ELECTRODIALYSIS CELL COMPRISING TWO ELECTRODES, A SERIES OF ION-EXCHANGE MEMBRANCE BETWEEN TWO ELECTRODES DIVIDING THE SPACE THEREBETWEEN INTO COMPARTMENTS, SPACERS AROUND THE EDGES OF THE MEMBRANCES IN THE SHAPES OF OPEN FRAMES SEPARATING THE MEMBRANCES, SAID MEMBRANCES AND SPACERS EACH HAVING SUCCESSIVELY COMMUNICATING HOLES THROUGH THEM COOPERATING TO FORM CONDUITS THROUGH THE CELL AT RIGHT ANGLES TO THE MEMBRANCES, SOME OF SAID HOLES EXTENDING TO THE INSIDE EDGES OF SAID SPACERS TO FORM PASSAGE MEANS THROUGH THEM SUBSTANTIALLY RECTANGULAR IN PLAN CONNECTING SAID CONDUITS TO SAID COMPARTMENTS, SAID PASSAGE MEANS EXTENDING ACROSS A SUBSTANTIAL PART OF THE LENGTH OF THE EDGES TO WHICH THEY EXTEND, AND RECTANGULAR INSERT MEANS FILL-
Claim 2
Dependent Claim
111 words
AN ELECTRODIALYSIS CELL COMPRISING TWO ELECTRODES, A SERIES OF ION-EXCHANGE MEMBRANCE BETWEEN TWO ELECTRODES DIVIDING THE SPACE THEREBETWEEN INTO COMPARTMENTS, SPACERS AROUND THE EDGES OF THE MEMBRANCES IN THE SHAPES OF OPEN FRAMES SEPARATING THE MEMBRANCES, SAID MEMBRANCES AND SPACERS EACH HAVING SUCCESSIVELY COMMUNICATING HOLES THROUGH THEM COOPERATING TO FORM CONDUITS THROUGH THE CELL AT RIGHT ANGLES TO THE MEMBRANCES, SOME OF SAID HOLES EXTENDING TO THE INSIDE EDGES OF SAID SPACERS TO FORM PASSAGE MEANS THROUGH THEM SUBSTANTIALLY RECTANGULAR IN PLAN CONNECTING SAID CONDUITS TO SAID COMPARTMENTS, SAID PASSAGE MEANS EXTENDING ACROSS A SUBSTANTIAL PART OF THE LENGTH OF THE EDGES TO WHICH THEY EXTEND, AND RECTANGULAR INSERT MEANS FILL-
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) | 1962-07-13 | 1963-01-12 | 1963-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-13 | 1967-01-12 | 1967-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-13 | 1971-01-12 | 1971-07-14 | $7700.00 | Window Closed / Lapsed |