US3781265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing consistently high-quality vinylidene fluoride polymer
Assignee: Pennwalt Corp
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Filing: 1972-10-17
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Granted: 1973-12-25
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Expires: 1992-10-17
Abstract
Abstract VINYLIDENE FLUORIDE POLYMERS OF HIGH-QUALITY ARE PREPARED CONSISTENTLY BY A PROCESS OF SUSPENSION POLYMERIZATION IN WHICH THE CHAIN TRANSFER AGENT (ACETONE), INITIATOR (DIISOPROPYLPEROXYDICARBONATE), REACTION ACCELERATOR (I, 1,2-TRICHLOROTRIFLUOROETHANE) AND MONOMER ARE FED INCREMENTALLY TO THE AQUEOUS REACTION MEDIUM.
Inventors
- 👤 J Dohany
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:31
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/18; C08F14/22; C08F2438/00; C08F2438/01
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |