Patent US5419807A successfully refreshed from Google Patents.
Patent US3110704A successfully refreshed from Google Patents.
US3110704A
Expired / Lapsed
US
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Low pressure tetrafluoroethylene polymerization process
Assignee: EIDP Inc
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Filing: 1960-03-31
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Granted: 1963-11-12
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Expires: 1980-03-31
Abstract
No abstract record available.
Inventors
- 👤 Halliwell Ronald Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:01
CPC Classifications
C; C08; C08F; C08F114/00; C08F114/18; C08F114/26; Y; Y10; Y10S; Y10S526/00; Y10S526/915
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
46 words
A PROCESS FOR POLYMERRIZING TETRAFLUOROETHYLENE WHICH COMPRISES CONTACTING ETRAFLUOROETHYLENE AT A TEMPERATURE IN THE RANGE OF 30*C. TO 80*C. WITH AN AQUEOUS POLYMERIZATION MEDIUM CONTAINING AN INORGANIC REDOX INTIATOR SYSTEM AND COPPER ION ACCELERATOR, AT A PRESSURE IN THE RANGE OF 0.6 TO 4 ATMOSPHERES ABSOLUTE.
Claim 2
Dependent Claim
46 words
A PROCESS FOR POLYMERRIZING TETRAFLUOROETHYLENE WHICH COMPRISES CONTACTING ETRAFLUOROETHYLENE AT A TEMPERATURE IN THE RANGE OF 30*C. TO 80*C. WITH AN AQUEOUS POLYMERIZATION MEDIUM CONTAINING AN INORGANIC REDOX INTIATOR SYSTEM AND COPPER ION ACCELERATOR, AT A PRESSURE IN THE RANGE OF 0.6 TO 4 ATMOSPHERES ABSOLUTE.
Claim 3
Dependent Claim
75 words
A PROCESS FOR POLYMERIZING TETAFLUOROETHYLENE WHICH COMPRISES CONTACTING TETRAFLUOROETHYLENE AT A TEMPERATURE IN THE RANGE OF 30*C. TO 80*C. WITH AN AQUEOUS POLYMERIZATION MEDIUM CONTAINING, PERMILLION PARTS BY WEIGHT, 5 TO 180 PARTS PERSULFATE ION AND 10 TO 360 PARTS BISUFITE ION AS AN INORGANIC INIATOR, AND 0.02 TO 2 PARTS COPPER ION AND 1 TO 500 PARTS OF INERT HALOGENATED ORGANIC DISPERSING AGENT AS ACCELERATORS, UNDER A PRESSURE OF 0.6 TO 4 ATMOSPHERES ABSOLUTE.
Claim 4
Dependent Claim
75 words
A PROCESS FOR POLYMERIZING TETAFLUOROETHYLENE WHICH COMPRISES CONTACTING TETRAFLUOROETHYLENE AT A TEMPERATURE IN THE RANGE OF 30*C. TO 80*C. WITH AN AQUEOUS POLYMERIZATION MEDIUM CONTAINING, PERMILLION PARTS BY WEIGHT, 5 TO 180 PARTS PERSULFATE ION AND 10 TO 360 PARTS BISUFITE ION AS AN INORGANIC INIATOR, AND 0.02 TO 2 PARTS COPPER ION AND 1 TO 500 PARTS OF INERT HALOGENATED ORGANIC DISPERSING AGENT AS ACCELERATORS, UNDER A PRESSURE OF 0.6 TO 4 ATMOSPHERES ABSOLUTE.
References Cited (Backward Citations)
US2559752A
Cited
US2820026A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-11-11 | 1967-05-13 | 1967-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-11 | 1971-05-13 | 1971-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-11 | 1975-05-13 | 1975-11-12 | $7700.00 | Window Closed / Lapsed |