Patent US3637631A successfully refreshed from Google Patents.
US3637631A
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Homopolymerization of vinyl fluoride to orientable polyvinyl fluoride in a medium containing tertiary butyl alcohol
Assignee: Montedison SpA
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Filing: 1969-04-08
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Granted: 1972-01-25
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Expires: 1989-04-08
Abstract
Abstract THERE IS DISCLOSED HEREIN AN IMPROVED PROCESS FOR POLYMERIZING VINYL FLUORIDE TO ORIENTABLE POLYVINYL FLUORIDE. THE ORIENTABLE HOMOPOLYMER IS OBTAINED BY POLYMERIZING VINYL FLUORIDE IN TERT. BUTYL ALCOHOL AS LIQUID MEDIUM, AND IN CONTACT WITH RADICAL INITIATORS UNDER PRACTICAL TEMPERATURE AND PRESSURE CONDITIONS.
Inventors
- 👤 Dario Sianesi
- 👤 Gerardo Caporiccio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:15
CPC Classifications
C; C08; C08F; C08F114/00; C08F114/18; C08F114/20; C08F14/00; C08F14/18; C08F14/20
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |