Patent US2631999A successfully refreshed from Google Patents.
US2631999A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anion exchange resins from primary or secondary amines and methyl styrene polymers
Assignee: Dow Chemical Co
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Filing: 1948-12-29
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Granted: 1953-03-17
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Expires: 1968-12-29
Abstract
No abstract record available.
Inventors
- 👤 Elmer L Mcmaster
- 👤 Robert M Wheaton
- 👤 Skidmore James Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:58
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30; C08F8/32; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A METHOD OF MAKING AN ANION EXCHANGE RESIN WHICH COMPRISES REACTING, AT TEMPERATURES BETWEEN 25* AND 100* C. A SOLID HALOGENATED BENZENE-INSOLUBLE COPOLYMER, CONTAINING IN CHEMICALLY COMBINED FROM 0.5 TO 40 PARTS BY WEIGHT OF A POLYVINYL-AROMATIC HYDROCARBON AND FROM 99.5 TO 60 PARTS OF AN AR-ALKYL-MONOVINYLAROMATIC HYDROCARBON HAVING THE VINYL RADICAL AND FROM 1 TO 3 METHYL RADICALS AS NUCLEAR SUBSTITUENTS, SAID HALOGENATED COPOLYMER HAVING A REACTIVE SUBSTITUENT HALOGEN ATOM ATTACHED TO EACH OF AT LEAST A PORTION OF THE METHYL RADICALS, WITH A NITROGEN-CONTAINING BASE SELECTED FROM THE GROUP CONSISTING OF AMMONIA AND PRIMARY AND SECONDARY AMINES, IN AMOUNT SUCH THAT AT LEAST ONE TRIVALENT NITROGEN ATOM HAVING AT LEAST ONE HYDROGEN ATOM ATTACHED THERETO IS PRESENT IN THE REACTION MIXTURE FOR EACH REACTIVE SUBSTITUENT HALOGEN ATOM ATTACHED TO CARBON OF A METHYL RADICAL IN THE POLYMERIC REACTANT.
Claim 2
Independent Claim
140 words
A METHOD OF MAKING AN ANION EXCHANGE RESIN WHICH COMPRISES REACTING, AT TEMPERATURES BETWEEN 25* AND 100* C. A SOLID HALOGENATED BENZENE-INSOLUBLE COPOLYMER, CONTAINING IN CHEMICALLY COMBINED FROM 0.5 TO 40 PARTS BY WEIGHT OF A POLYVINYL-AROMATIC HYDROCARBON AND FROM 99.5 TO 60 PARTS OF AN AR-ALKYL-MONOVINYLAROMATIC HYDROCARBON HAVING THE VINYL RADICAL AND FROM 1 TO 3 METHYL RADICALS AS NUCLEAR SUBSTITUENTS, SAID HALOGENATED COPOLYMER HAVING A REACTIVE SUBSTITUENT HALOGEN ATOM ATTACHED TO EACH OF AT LEAST A PORTION OF THE METHYL RADICALS, WITH A NITROGEN-CONTAINING BASE SELECTED FROM THE GROUP CONSISTING OF AMMONIA AND PRIMARY AND SECONDARY AMINES, IN AMOUNT SUCH THAT AT LEAST ONE TRIVALENT NITROGEN ATOM HAVING AT LEAST ONE HYDROGEN ATOM ATTACHED THERETO IS PRESENT IN THE REACTION MIXTURE FOR EACH REACTIVE SUBSTITUENT HALOGEN ATOM ATTACHED TO CARBON OF A METHYL RADICAL IN THE POLYMERIC REACTANT.
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) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |