Patent US3013994A successfully refreshed from Google Patents.
US3013994A
Expired / Lapsed
US
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Anion exchange and chelate exchange resinous polymers
Assignee: Dow Chemical Co
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Filing: 1959-04-06
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Granted: 1961-12-19
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Expires: 1979-04-06
Abstract
No abstract record available.
Inventors
- 👤 Melvin J Hatch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:01
CPC Classifications
B; B01; B01J; B01J45/00; B01J41/00; B01J41/08; B01J41/12; B01J41/14; C; C08; C08F; C08F8/00; C08F8/30; C08F8/32; Y; Y10; Y10S; Y10S71/00; Y10S71/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A WATER-INSOLUBLE RESINOUS POLYMER THE MATRIX OF WHICH CONSISTS ESSENTIALLY OF POLYMERIC VINYLBENZYL UNITS HAVING FROM CA. 0.25 TO 1.5 TRIS(HYDROXYMETHYL)AMINOMETHANE GROUPS PER ARYL NUCLEUS, SAID POLYMER BEING CROSSLINKED WITH BETWEEN ABOUT 0.2 AND 20 WEIGHT PERCENT OF A CROSSLINKING AGENT HAVING TWO VINYLIDENE GROUPS.
Claim 2
Dependent Claim
45 words
A WATER-INSOLUBLE RESINOUS POLYMER THE MATRIX OF WHICH CONSISTS ESSENTIALLY OF POLYMERIC VINYLBENZYL UNITS HAVING FROM CA. 0.25 TO 1.5 TRIS(HYDROXYMETHYL)AMINOMETHANE GROUPS PER ARYL NUCLEUS, SAID POLYMER BEING CROSSLINKED WITH BETWEEN ABOUT 0.2 AND 20 WEIGHT PERCENT OF A CROSSLINKING AGENT HAVING TWO VINYLIDENE GROUPS.
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) | 1964-12-18 | 1965-06-19 | 1965-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-18 | 1969-06-19 | 1969-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-18 | 1973-06-19 | 1973-12-19 | $7700.00 | Window Closed / Lapsed |