Patent US3549562A successfully refreshed from Google Patents.
US3549562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of ion exchange resin particles
Assignee: Dow Chemical Co
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Filing: 1965-06-14
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Granted: 1970-12-22
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Expires: 1985-06-14
Abstract
No abstract record available.
Inventors
- 👤 Morris Mindick
- 👤 Jerry J Svarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:23
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08J9/286; B; B01; B01J; B01J41/00; B01J41/08; B01J41/12; B01J41/14; C08F; C08F8/00; C08F8/18; C08F8/24; C08F8/44; C08F2800/00; C08F2800/20; C08F2810/00; C08F2810/20; C08J2325/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A PROCESS FOR THE PRODUCTION OF A COPOLYMER OF A MONOVINYL BENZENOID MONOMER AND A DIVINYL BENZENOID MONOMER WHICH COMPRISES: DISPERSING IN WATER, AS A DISPERSION OF DROPLETS, A SOLUTION IN A WATER-IMMISCIBLE, LIQUID SOLVENT SELECTED FROM THE GROUP CONSISTING OF BENZENE, LOWER ALKYL BENZENE, CHLOROBENZENE, BROMOBENZENE, ETHYLENE DICHLORIDE AND ETHYLENT DIBROMIDE OF A MIXTURE OF SAID MONOMERS IN A WEIGHT PROPORTION OF ABOUT 20% TO 40% OF SAID DIVINYL MONOMER AND WITH THE BALANCE BEING SAID MONOVINYL MONOMER, IN WHICH SOLUTION SAID SOLVENT CONSTITUTES ABOUT 30% TO 70% BY WEIGHT BASED ON THE WEIGHT OF SAID MONOMERS PLUS SAID SOLVENT, AND COPOLYMERIZING SAID MONOMERS IN SAID DISPERSION.
Claim 2
Dependent Claim
70 words
A PROCESS FOR PRODUCING A QUATERNARY AMMONIUM ION EXCHANGE RESIN WHICH COMPRISES CHLOROMETHYLATING A COPOLYMER PRODUCED IN ACCORDANCE WITH THE PROCESS OF CLAIM 7 WITH CHLOROMETHYL METHYL ETHER AT ABOUT REFLUX TEMPERATURE IN THE PRESENCE OF A FRIEDEL-CRAFTS CATALYST UNTIL SAID COPOLYMER CONTAINS AN AVERAGE OF 0.8 TO 1.2 CHLOROMETHYL GROUPS PER AROMATIC NUCLEUS OF SAID, COPOLYMER, AND THEREAFTER QUATERNIZING THE CHLOROMETHYL GROUPS OF SAID COPOLYMER WITH A TERTIARY AMINE.
References Cited (Backward Citations)
US2591574A
Cited
US2800445A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |