US3585126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose mixed ester reverse osmosis membrane and its use
Assignee: Aerojet Rocketdyne Inc
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Filing: 1969-02-19
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Granted: 1971-06-15
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Expires: 1989-02-19
Abstract
Abstract A REVERSE OSMOSIS MEMBRANE PREPARED FROM MIXED ESTERS OF CELLULOSE, FOR EXAMPLE, CELLULOSE ACETATE PROPIONATE, CELLULOSE ACETATE ISOBUTYRATE, CELLULOSE ACETATE MALEATE, AND CELLULOSE ACETATE METHACRYLATE. THE PROPERTIES OF MEMBRANES CONTAINING AN UNSATURATED ESTER MAY BE ALTERED BY CROSS-LINKING THROUGH THE UNSATURATED GROUP. THE DEGREE OF TOTAL ESTER SUBSTITUTION IS DESIRABLY IN THE RANGE OF 2.4 TO 2.8, PREFERABLY IN THE RANGE OF 2.5 TO 2.7.
Inventors
- 👤 Charles R Cannon
- 👤 Paul A Cantor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:40
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/12; B01D71/14; B01D71/18; B01D2323/00; B01D2323/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |