Patent US3787379A successfully refreshed from Google Patents.
US3787379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of vinyl fluoride and hexafluoropropene
Assignee: Arkema Inc
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Filing: 1971-10-05
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Granted: 1974-01-22
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Expires: 1991-10-05
Abstract
Abstract HIGH MOLECULAR WEIGHT, HEAT STABLE, EASILY PROCESSABLE COPOLYMER OF VINYL FLUORIDE AND HEXAFLUOROPROPENE CONTAINING FROM 2 TO 10 MOLE PERCENT OF POLYMERIZED UNITS OF HEXAFLUOROPROPENE ARE PREPARED BY POLYMERIZING THE COMONOMERS AT PRESSURE BELOW 7000 P.S.I. IN A REACTION MEDIUM COMPRISED OF PERFLUOROALKANE OR PERFLUOROCHALOROALKANE SOLVENT, OR A MIXTURE THEREOF WITH WATER, CONTAINING AN EFFECTIVE AMOUNT OF POLYMERIZATION INITIATOR HAVING A TEN-HOUR HALF LIFE AT A TEMPERATURE BETWEEN 0 AND 50 C., WITHIN WHICH RANGE THE POLYMERIZATION IS CARRIED OUT
Inventors
- 👤 R Ferren
- 👤 D Dimmig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:12
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/20
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |