US2656241A
Expired / Lapsed
US
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Further aminized aminoalkylated celluloses by reacting with ethylenimine
Assignee: Individual
•
Filing: 1951-05-11
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Granted: 1953-10-20
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Expires: 1971-05-11
Abstract
No abstract record available.
Inventors
- 👤 Jr George L Drake
- 👤 John D Guthrie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:11
CPC Classifications
B; B01; B01J; B01J41/00; B01J41/08; B01J41/12; B01J41/16; C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/14; C08B11/145; Y; Y10; Y10T; Y10T24/00; Y10T24/16; Y10T24/1688
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
70 words
A PROCESS OF PRODUCING AN ION-EXCHANGE FABRIC WHICH AFTER USE AND REGENERATIONF OR AT LEAST FOUR CYCLES HAS AN ION-EXCHANGE CAPACITY OF AT LEAST ABOUT 1400 MILLI-EQUIVALENTS, AND WHICH POSSESSES CELLULOSIC FIBROUS CHARACTER COMPRISING: REACTING AMINOETHYLATED COTTON FABRIC CONTAINING 0.5 TO 1.8% NITROGEN WITH ETHYLENIMINE UNTIL THE FABRIC CONTAINS FROM 2 TO 5% NITROGEN, THE AMINOETHYLATED COTTON BEING ONE OBTAINED BY TREATING COTTON FABRIC WITH AMINOETHYLSULFURIC ACID AND SODIUM HYDROXIDE.
References Cited (Backward Citations)
US2097120A
Cited
US2459222A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-19 | 1957-04-20 | 1957-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-19 | 1961-04-20 | 1961-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-19 | 1965-04-20 | 1965-10-20 | $7700.00 | Window Closed / Lapsed |