US2965595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerizing tetrafluoroethylene in the presence of polymerstabilizing agents
Assignee: EIDP Inc
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Filing: 1955-12-05
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Granted: 1960-12-20
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Expires: 1975-12-05
Abstract
No abstract record available.
Inventors
- 👤 Brinker Keith Clark
- 👤 Bro Manville Isager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:28
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F14/00; C08F14/18; C08F14/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A PROCESS FOR PREPARING AQUEOUS DISPERSION OF POLYTETRAFLUOROETHYLENE WHICH COMPRISES CONTACTING, AT A TEMPERATURE OF 0* TO 100*C., TETRAFLUOROETHYLENE WITH AN AQUEOUS MEDIUM, HAVING THEREIN DISSOLVED A WATER-SOLUBLE POLYMERIZATION CATALYST AND A SALT OF A POLYFLUOROALKANOIC ACID AS A DISPERSING AGENT, IN THE PRESENCE OF AN INSOLUBLE SATURATED HYDROCARBON HAVING MORE THAN 12 CARBON ATOMS WHICH IS LIQUID AT POLYMERIZATION TEMPERATURES AND IN THE PRESENCE OF 0.01 TO 2.5 MOL PERCENT OF THE MONOMER OF HYDROGEN.
Claim 2
Dependent Claim
76 words
A PROCESS FOR PREPARING AQUEOUS DISPERSION OF POLYTETRAFLUOROETHYLENE WHICH COMPRISES CONTACTING, AT A TEMPERATURE OF 0* TO 100*C., TETRAFLUOROETHYLENE WITH AN AQUEOUS MEDIUM, HAVING THEREIN DISSOLVED A WATER-SOLUBLE POLYMERIZATION CATALYST AND A SALT OF A POLYFLUOROALKANOIC ACID AS A DISPERSING AGENT, IN THE PRESENCE OF AN INSOLUBLE SATURATED HYDROCARBON HAVING MORE THAN 12 CARBON ATOMS WHICH IS LIQUID AT POLYMERIZATION TEMPERATURES AND IN THE PRESENCE OF 0.01 TO 2.5 MOL PERCENT OF THE MONOMER OF HYDROGEN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |