US3290286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Partially hydrolyzed cellulosic reverse osmosis membranes and methods of preparing the same
Assignee: Aerojet Rocketdyne Inc
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Filing: 1965-10-18
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Granted: 1966-12-06
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Expires: 1985-10-18
Abstract
No abstract record available.
Inventors
- 👤 Robert E Kesting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:41
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
28 words
IN THE PREPARATION OF CELLULOSIC ESTER REVERSE OSMOSIS MEMBRANCES, THE IMPROVEMENT WHICH COMPRISES REACTING THE MEMBRANE WITH AN ALKALI SOLUTION TO PARTIALLY CONVERT ESTER GROUPS TO HYDROXYL GROUPS.
Claim 2
Dependent Claim
10 words
A REVERSE OSMOSIS MEMBRANE PREPARED USING THE METHOD OF CLAIM2.
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) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |