Patent US3769368A successfully refreshed from Google Patents.
US3769368A
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US
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Grafted copolymer with two sequences of recurring units and methods of producing same
Assignee: Compagnie Francaise de Raffinage SA
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Filing: 1971-12-20
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Granted: 1973-10-30
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Expires: 1991-12-20
Abstract
Abstract A COPOLYMER WITH TWO SEQUENCES OF RECURRING UNITS IS PRODUCED BY FIRST FORMING A HOMOPOLYMER WITH A BENZENE RING AT ONE OF ITS ENDS, THEN EFFECTING CHLOROMETHYLATION OF THE BENZENE RING AND FINALLY EFFECTING CATIONIC GRAFTING OF A MONOMER ONTO THE CHLOROMETHYL GROUP OF THE HOMOPOLYMER.
Inventors
- 👤 J Peyrot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:26
CPC Classifications
C; C08; C08F; C08F293/00; Y; Y10; Y10S; Y10S525/00; Y10S525/918
Claims Analysis
Total Claims: 0
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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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |