Patent US3723387A successfully refreshed from Google Patents.
US3723387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of curable and cured fluoropolymer products
Assignee: EIDP Inc
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Filing: 1971-05-12
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Granted: 1973-03-27
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Expires: 1991-05-12
Abstract
Abstract A CURABLE FLUOROPOLYMER WHICH WILL UNDERGO CROSSLINKING WHEN HEATED IN THE PRESENCE OF A CROSS-LINKING AGENT (E.G. RESORCINOL) AND AN ACID CATALYST (E.G. ISOPROPYLTOSYLATE) CAN BE MADE FROM A COPOLYMER-FORMING REACTION MIXTURE CONTAINING VINYLIDENE FLUORIDE, AT LEAST ONE OTHER FLUORINATED ETHYLENICALLY UNSATURATED MONOMER CONTAINING AT LEAST AS MANY FLUORINE ATOMS AS CARBON ATOMS, AND A SMALL AMOUNT OF ALLYLIDENE DIACETATE OR ACROLEIN DIMETHYLACETAL. THE RESULTING VINYLEDENE FLUORIDE COPOLYMER CAN BE USED TO MAKE CURED OR CROSS-LINKED FLUOROPOLYMER PRODUCTS HAVING BENEFICIAL UTILITY IN APPLICATIONS WHERE RESISTANCE TO DEGRADATION BY STREAM IS REQUIRED.
Inventors
- 👤 J Nyce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:58
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/22; C08F214/225
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |