US2980635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion-exchange articles and method of manufacture from acrylonitrile polymer aquagels
Assignee: Dow Chemical Co
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Filing: 1957-02-07
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Granted: 1961-04-18
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Expires: 1977-02-07
Abstract
No abstract record available.
Inventors
- 👤 Clyde W Davis
- 👤 Forrest A Ehlers
- 👤 Robert D Barnard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:05
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/018
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
67 words
A POLYMERIC ACRYLONITRILE AQUAGEL COMPOSITION CONSISTING OF A POLYMER OF AT LEAST 80 PERCENT ACRYLONITRILE IN THE AQUAGEL FORM IN THE POLYMER MOLECULE, THE BAL. ANCE OF THE POLYMER MOLECULE BEING COPOLYMERIZED ETHYLENICALLY UNSATURATED COMONOMER, ABOUT 50 WEIGHT PERCENT OF WATER, COMPOSITION BASIS, SAID AQUAGEL HAVINE FINELY DIVIDED ION EXCHANGE RESIN PARTICLES DISPERSED THEREIN IN AMOUNT SUFFICIENT TO CAUSE THE COMPOSITION TO FUNCTION AS AN ION EXCHANGER.
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) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |