Patent US2747132A successfully refreshed from Google Patents.
US2597439A
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Weakly basic anion-exchange polymers
Assignee: Rohm and Haas Co
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Filing: 1951-05-12
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Granted: 1952-05-20
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Expires: 1971-05-12
Abstract
No abstract record available.
Inventors
- 👤 George W Bodamer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:37
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/44; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A PROCESS FOR PREPARING SOLID, WATER-INSOLUBLE, ANION-EXCHANGE RESINS WHICH COMPRISES PROLIFEROUSLY POLYMERIZING STYRENE AT A TEMPERATURE FROM ABOUT 20* C. TO ABOUT 80* C. IN THE SUBSTANTIALLY COMPLETE ABSENCE OF OXYGEN AND IN THE PRESENCE OF A SEED OF A PREVIOUSLY PREPARED PROLIFEROUS POLYMER, THEN CHLOROMETHYLATING THE RESULTANT PROLIFEROUS POLYMER WHEREBY CHLOROMETHYL GROUPS ARE ATTACHED TO THE AROMATIC NUCLEI IN AN AMOUNT EQUAL TO AT LEAST ONE CHLOROMETHYL GROUP FOR EVERY FITEEEN AROMATIC NUCLEI IN SAID PROLIFEROUS POLYMER, REACTING THE RESULTANT CHLOROMETHYLATED PROLIFEROUS POLYMER WITH AN AMINE FROM THE CLASS CONSISTING OF PRIMARY AND SECONDARY AMINES, AND THEREAFTER ISOLATING THE RESULTANT ANION-EXCHANGE RESIN.
Claim 2
Dependent Claim
103 words
A PROCESS FOR PREPARING SOLID, WATER-INSOLUBLE, ANION-EXCHANGE RESINS WHICH COMPRISES PROLIFEROUSLY POLYMERIZING STYRENE AT A TEMPERATURE FROM ABOUT 20* C. TO ABOUT 80* C. IN THE SUBSTANTIALLY COMPLETE ABSENCE OF OXYGEN AND IN THE PRESENCE OF A SEED OF A PREVIOUSLY PREPARED PROLIFEROUS POLYMER, THEN CHLOROMETHYLATING THE RESULTANT PROLIFEROUS POLYMER WHEREBY CHLOROMETHYL GROUPS ARE ATTACHED TO THE AROMATIC NUCLEI IN AN AMOUNT EQUAL TO AT LEAST ONE CHLOROMETHYL GROUP FOR EVERY FITEEEN AROMATIC NUCLEI IN SAID PROLIFEROUS POLYMER, REACTING THE RESULTANT CHLOROMETHYLATED PROLIFEROUS POLYMER WITH AN AMINE FROM THE CLASS CONSISTING OF PRIMARY AND SECONDARY AMINES, AND THEREAFTER ISOLATING THE RESULTANT ANION-EXCHANGE RESIN.
References Cited (Backward Citations)
US2311615A
Cited
US2537951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |