US3784489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anion exchange resins from alkylated condensation polymers of polyethyleneimine and dihaloalkanes
Assignee: Individual
•
Filing: 1972-03-06
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Granted: 1974-01-08
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Expires: 1992-03-06
Abstract
Abstract ANION EXCHANGE RESINS ARE PRODUCED BY (A) CONDENSING POLYETHYLENEIMINE WITH AT LEAST ONE DIHALOALKANE, FOLLOWED BY (B) REACTING THE PRODUCT OF (A) WITH AN ALKYLATING AGENT TO CONVERT SUBSTANTIALLY ALL OF THE NONTERTIARY AMINE GROUPS IN (A) TO TERTIARY OR QUATERNARY AMINE GROUPS.
Inventors
- 👤 M Dales
- 👤 Whang J Jai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:10
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; B; B01; B01J; B01J41/00; B01J41/08; B01J41/12; B01J41/13
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |