Patent US2862894A successfully refreshed from Google Patents.
US2862894A
Expired / Lapsed
US
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Preparation of anion-exchange resins containing weakly basic and strongly basic functional groups
Assignee: Rohm and Haas Co
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Filing: 1956-11-28
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Granted: 1958-12-02
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Expires: 1976-11-28
Abstract
No abstract record available.
Inventors
- 👤 Jesse C H Hwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:48
CPC Classifications
B; B01; B01J; B01J41/00; B01J41/08; B01J41/12; B01J41/14; B01J41/13; C; C08; C08F; C08F8/00; C08F8/30; C08F8/32; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
A PROCESS FOR PREPARING AN ANION-EXCHANGE RESIN WHICH CONTAINS BOTH WEAKLY BASIC ANION-ABSORBING GROUPS AND STRONGLY BASIC QUATERANRY AMONIUM ANIONABSORBING GROUPS WHICH COMPRISES REACTING A POLYAMINE OF THE GENERAL FORMULA
Claim 2
Dependent Claim
30 words
A PROCESS FOR PREPARING AN ANION-EXCHANGE RESIN WHICH CONTAINS BOTH WEAKLY BASIC ANION-ABSORBING GROUPS AND STRONGLY BASIC QUATERANRY AMONIUM ANIONABSORBING GROUPS WHICH COMPRISES REACTING A POLYAMINE OF THE GENERAL FORMULA
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) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |