US2597437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cation-exchange polymers of the carboxylic type
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
2026-10-24 18:41
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/20; C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A PROCESS FOR PREPARING AN OPAQUE, INFUSIBLE, PROLIFEROUS POLYMER WHICH FORMS AN INSOLUBLE, IMPALPABLE SUSPENSION IN WATER AND IS CAPABLE OF EXCHANGING CATIONS, WHICH PROCESS COMPRISES PROLIFEROUSLY COPOLYMERIZING, 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, A MIXTURE OF (A) A MONOMERIC ESTER OF ACRYLIC ACID AND (B) A POLYOLEFINIC ORGANIC COMPOUND IN WHICH THE OLEFINIC LINKAGES ARE IN THE ACYCLIC PORTION OF THE MOLECULE AND ARE THE REACTIVE GROUPS WHICH ENTER INTO THE COPOLYMERIZATION REACTION, SAID MIXTURE CONTAINING AT LEAST 70% ACRYLIC ACID, AND THEN HYDROLYZING THE RESULTANT PROLIFEROUS COPOLYMER BY MEANS OF A SOLUTION OF A STRONG BASE AND THEREAFTER ISOLATING SAID OPAQUE, INFUSIBLE, PROLIFEROUS POLYMER.
Claim 2
Dependent Claim
131 words
A PROCESS FOR PREPARING AN OPAQUE, INFUSIBLE, PROLIFEROUS POLYMER WHICH FORMS AN INSOLUBLE, IMPALPABLE SUSPENSION IN WATER AND IS CAPABLE OF EXCHANGING CATIONS, WHICH PROCESS COMPRISES PROLIFEROUSLY COPOLYMERIZING, 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, A MIXTURE OF (A) A MONOMERIC ESTER OF ACRYLIC ACID AND (B) A POLYOLEFINIC ORGANIC COMPOUND IN WHICH THE OLEFINIC LINKAGES ARE IN THE ACYCLIC PORTION OF THE MOLECULE AND ARE THE REACTIVE GROUPS WHICH ENTER INTO THE COPOLYMERIZATION REACTION, SAID MIXTURE CONTAINING AT LEAST 70% ACRYLIC ACID, AND THEN HYDROLYZING THE RESULTANT PROLIFEROUS COPOLYMER BY MEANS OF A SOLUTION OF A STRONG BASE AND THEREAFTER ISOLATING SAID OPAQUE, INFUSIBLE, PROLIFEROUS POLYMER.
References Cited (Backward Citations)
US2340111A
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 |