US3582505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchangers from poly(aminostyrene) and ethylene imine
Assignee: Nv Octrooien Activit Mij
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Filing: 1969-10-23
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Granted: 1971-06-01
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Expires: 1989-10-23
Abstract
Abstract ANION EXCHANGES ARE PREPARED FROM POLYMERS OF VINYL AROMATIC HYDROCARBONS IN WHICH PRIMARY AMINO GROUPS HAVE BEEN INTRODUCED INTO THE AROMATIC NUCLEI BY REACTING SUCH AMINATED POLYMERS WITH ETHYLENE IMINE. IF DESIRED, THE THUS OBTAINED WEAKLY BASIC POLYAMINE RESIN MAY BE QUATERNARIZED.
Inventors
- 👤 Geert Jan De Jong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:19
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30; B; B01; B01J; B01J41/00; B01J41/08; B01J41/12; B01J41/14; C08F8/44
Claims Analysis
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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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |