US3579288A
Expired / Lapsed
US
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Permselective cellulose membranes reacted with a sulfonated trichloropyrimidine dye,2,3 - dichloroquinoxaline dye or dichloro-s-triozines
Assignee: PRIME MINISTER S OFFICE ISRAEL
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Filing: 1966-09-20
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Granted: 1971-05-18
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Expires: 1986-09-20
Abstract
Abstract A PROCESS FOR MAKING PERMSELECTIVE MEMBRANES COMPRISES REACTING A CELLULOSIC FILM OR PARCHMENTIZED CELLULOSIC SHEET OF ABOUT 0.1 MM. THICKNESS WITH AN AQUEOUS SOLUTION OF A SULFONATED COMPOUND OF THE GROUP CONSISTING OF A SULFONATED TRICHLOROPYRIMIDINE DYE, A SULFONATED 2,3-DICHLOROQUINOXALINE REACTIVE DYE, AND A SULFONATED DICHLORO-S-TRIAZINE, IN HIGH CONCENTRATION FOR A PERIOD OF TIME IN THE ORDER OF AT LEAST THREE HOURS UNTIL SAID CELLULOSIC FILM OR SHEET IS CONVERTED TO PERMSELECTIVE MEMBRANE EXHIBITING PERMSELECTIVITY EXCEEDING 14 MV. IN A CELL CONTAINING N/10 TO N/20 POTASSIUM CHLORIDE, AND EXHIBITING AN ELECTRICAL RESISTANCE OF LESS THAN 20 OHMS/ CM.2.
Inventors
- 👤 Adalbert Suszer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:17
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2212; C08J2301/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |