US2632001A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anion exchange resins from tertiary amines and methyl styrene polymers
Assignee: Dow Chemical Co
•
Filing: 1948-12-29
•
Granted: 1953-03-17
•
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
2026-10-24 09:33
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/44
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
111 words
A WATER-INSOLUBLE REACTION PRODUCT OF A HALOGENATED BENZENE-INSOLUBLE SOLID 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 ARALKYL-MONOVINYL-AROMATIC HYDROCARBON HAVING THE VINYL RAIDCAL AND FROM 1 TO 3 METHYL RADICALS AS NUCLEAR SUBSTITUENTS, WHICH HALOGENATED COPOLYMER CONTAINS SUBSTANTIAL NUCLEAR HALOGENATION AND HAS A REACTIVE HALOGEN ATOM SUBSTITUTED FOR A HYDROGEN ATOM IN AT LEAST A PORTION OF THE METHYL RADICALS, AND A TERTIARY AMINE IN AMOUNT SUCH THAT SUBSTANTIALLY EACH REACTIVE SUBSTITUENT HALOGEN ATOM ATTACHED TO CARBON OF A METHYL RADICAL IN THE HALOGENATED COPOLYMER IS REPLACED BY A NITROGEN ATOM OF THE TERTIARY AMINE.
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 |