Patent US3872067A successfully refreshed from Google Patents.
US3872067A
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Process for preparing chloromethylated polystyrene-divinylbenzene copolymer
Assignee: ATK Launch Systems LLC
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Filing: 1973-09-17
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Granted: 1975-03-18
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Expires: 1993-09-17
Abstract
Abstract The invention described herein provides another process for preparing chloromethylated polystyrene - divinylbenzene copolymer involving the reaction of styrene, vinylbenzyl chloride and divinylbenzene.
Inventors
- 👤 Nicholas D Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:04
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08; C08F212/14; C08F212/16; C08F212/18; C08F212/34; C08F212/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
THE PROCESS FOR PREPARING CHLOROMETHYLATED POLYSTYRENEDIVINYLBENZENE COPOLYMER WHICH CONSISTS IN POLYMERIZING STYRENE, VINYLBENZYL CHLORIDE AND DIVINYLBENZENE IN THE PRESENCE OF BENZOYL PEROXIDE.
Claim 2
Dependent Claim
22 words
THE PROCESS FOR PREPARING CHLOROMETHYLATED POLYSTYRENEDIVINYLBENZENE COPOLYMER WHICH CONSISTS IN POLYMERIZING STYRENE, VINYLBENZYL CHLORIDE AND DIVINYLBENZENE IN THE PRESENCE OF BENZOYL PEROXIDE.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |