Patent US2872407A successfully refreshed from Google Patents.
US2872407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for modifying the chemical composition of fluids by ion transfer
Assignee: Individual
•
Filing: 1957-04-17
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Granted: 1959-02-03
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Expires: 1977-04-17
Abstract
No abstract record available.
Inventors
- 👤 Kollsman Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:44
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/46; B01D61/50
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
90 words
AN APPARATUS FOR IONICALLY CONCENTRATING AND DEIONIZING LIQUIDS BY ION TRANSFER, COMPRISING MEANS FORMMING A PLURALITY OF CHAMBERS IN EXCESS OF FOUR, THE CHAMBERS BEING ARRANGED SIDE-BY-SIDE, AND LIQUID SEPARATING ION PERMEABLE MEMBRANES BETWEEN ADJACENT CHAMBERS FOR ESTABLISHING A PATH FOR IONS FROM ONE CHAMBER INTO AN ADJACENT CHAMBER UNDER THE INFLUENCE OF A BIAS, ALTERNATING MEMBRANES BEING PERMEABLE TO IONS OF ONE SIGN AND THE REMAINING MEMBRANES BEING PERMEABLE TO IONS OF THE OPPOSITE SIGN, AND MEANS FOR ESTABLISHING A BIAS TO DRIVE IONS FROM CERTAIN CHAMBERS THROUGH BORDERING.
References Cited (Backward Citations)
US2758965A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-02 | 1962-08-04 | 1963-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-02 | 1966-08-04 | 1967-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-02 | 1970-08-04 | 1971-02-03 | $7700.00 | Window Closed / Lapsed |