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US3635926A
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Aqueous process for making improved tetrafluoroethylene / fluoroalkyl perfluorovinyl ether copolymers
Assignee: EIDP Inc
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Filing: 1969-10-27
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Granted: 1972-01-18
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Expires: 1989-10-27
Abstract
Abstract TOUGH, STABLE COPOLYMERS OF TETRAFLUOROETHYLENE MONOMER AND FLUOROVINYL ETHER MONOMERS CAN BE PRODUCED BY AQUEOUS POLYMERIZATION OF THE MONOMERS BY A PROCESS THAT REQUIRES THAT THE REATION BE CARRIED OUT AT FROM ABOUT 50 TO 110*C. IN THE PRESENCE OF A WATER-SOLUBLE INITIATOR SUCH AS AMMONIUM PERSULFATE, AN EMULSIFYING AGENT AND A GASEOUS CHAIN TRANSFER AGENT SUCH AS HYDROGEN, METHANE OR ETHANE.
Inventors
- 👤 William Franklin Gresham
- 👤 Alfons Franz Vogelpohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:26
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/262; C08F16/00; C08F16/12; C08F16/14; C08F16/24
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |