Patent US3779979A successfully refreshed from Google Patents.
US3779979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of novel high chlorinated butyl rubber and vulcanizable compositions containing the same
Assignee: Eneos Corp
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Filing: 1971-12-21
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Granted: 1973-12-18
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Expires: 1991-12-21
Abstract
Abstract A PROCESS FOR THE PREPARATION OF CHLORINATED ISOBUTYLENEMULTIOLEFIN COPOLYMER IN WHICH MORE THAN ONE BUT NOT EXCEEDING 2 CHLORINE ATOMS PER ONE DOUBLE BOND IN THE COPOLYMER ARE INTRODUCED BY CHLORINATING THE COPOLYMER IN THE PRESENCE OF A DAIRYLAMINE DERIVATE OF THE FORMULA R2-C6H4-N(-R1)-C6H4-R3 WHEREIN R1 REPRESENTS A HYDROCARBON RESIDUE OF 1-20 CARBON ATOMS AND R2 AND R3 EACH REPRESENT HYDROGEN OR A HYDROCARBON RESIDUE OF 1-20 CARBON ATOMS. THE CHLORINATED COPOLYMER EXHIBITS PARTICULARLY IMPROVED CO-VULCANIZABILITY, HEAT STABILITY AND ADHERABILITY.
Inventors
- 👤 S Tsuchiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:08
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |