US3812061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing anion exchange resins with sulfuryl chloride
Assignee: Rohm and Haas Co
•
Filing: 1972-04-27
•
Granted: 1974-05-21
•
Expires: 1992-04-27
Abstract
Abstract A NOVEL METHOD OF PREPARING ANION EXCHANGE RESINS IS PRESENTED WHICH UTILIZES THE CHLORINATION OF VINYL AROMATIC PPOLYMERS HAVING PENDANT METHYL GROUPS, E.G., CROSS-LINKED PPOLY(VINYLTOLUENE), SULFURYL CHLORIDE IS USED AS THE CHLORINATING AGENT IN THE PRESENCE OF A FREE RADICAL CATALYST. REACTION IS HIGHLY SELECTIVE AND ONLY TRACE AMOUNTS OF RING HALOGENATION ARE OBSERVED.
Inventors
- 👤 J Barrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:37
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20; B; B01; B01J; B01J41/00; B01J41/08; B01J41/12; B01J41/14; C08F8/34; C08F8/38
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |