US2510262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making ionic membranes
Assignee: University of Minnesota Twin Cities
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Filing: 1944-09-08
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Granted: 1950-06-06
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Expires: 1964-09-08
Abstract
No abstract record available.
Inventors
- 👤 Sollner Karl
- 👤 Charles W Carr
- 👤 Harry P Gregor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:56
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2212; C08J2301/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
THE PROCESS OF MAKING AN IONIC SELECTIVE PERMEABLE MEMBRANE HAVING LOW OHMIC VALUE AND HIGH ABSOLUTE PERMEABILITY WHICH COMPRISES CASTING A THIN LAYER OF A THERMOPLASTIC FILMFORMING CELLULOSE COMPOUND ON A FORMING MOLD, SOLIDIFYING SAID LAYER OF CELLULOSE COMPOUND ON SAID MOLD TO FORM A PERMEABLE MEMBRANE, OXIDIZING SAID PERMEABLE CELLULOSE MEMBRANE WHILE STILL ON THE MOLD WITH AN ALKALI METAL CAUSTIC TO FORM DISSOCIABLE GROUPS IN THE PORES OF SAID MEMBRANE, AND THEREAFTER DRYING THE MEMBRANE AND REMOVING THE MEMBRANE FROM SAID MOLD.
Claim 2
Dependent Claim
84 words
THE PROCESS OF MAKING AN IONIC SELECTIVE PERMEABLE MEMBRANE HAVING LOW OHMIC VALUE AND HIGH ABSOLUTE PERMEABILITY WHICH COMPRISES CASTING A THIN LAYER OF A THERMOPLASTIC FILMFORMING CELLULOSE COMPOUND ON A FORMING MOLD, SOLIDIFYING SAID LAYER OF CELLULOSE COMPOUND ON SAID MOLD TO FORM A PERMEABLE MEMBRANE, OXIDIZING SAID PERMEABLE CELLULOSE MEMBRANE WHILE STILL ON THE MOLD WITH AN ALKALI METAL CAUSTIC TO FORM DISSOCIABLE GROUPS IN THE PORES OF SAID MEMBRANE, AND THEREAFTER DRYING THE MEMBRANE AND REMOVING THE MEMBRANE FROM SAID MOLD.
References Cited (Backward Citations)
FR401355A
Cited
DE342621C
Cited
US1719633A
Cited
US1945933A
Cited
US1864244A
Cited
US1962327A
Cited
US2115044A
Cited
US2339885A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-05 | 1953-12-05 | 1954-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-05 | 1957-12-05 | 1958-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-05 | 1961-12-05 | 1962-06-06 | $7700.00 | Window Closed / Lapsed |