Patent US3265678A successfully refreshed from Google Patents.
US3265678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyvinyl fluoride
Assignee: EIDP Inc
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Filing: 1961-05-18
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Granted: 1966-08-09
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Expires: 1981-05-18
Abstract
No abstract record available.
Inventors
- 👤 Hecht James Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:14
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/20; C08F214/205; C08F114/00; C08F114/18; C08F114/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
IN A PROCESS FOR THE HOMOPOLYMERIZATION OF VINYL FLUORIDE WHEREIN VINYL FLUORIDE, WATER AND A WATER-SOLUBLE FREE RADICAL REACTION INITIATOR ARE INTRODUCED INTO A REACTOR MAINTAINED AT A CONSTANT TEMPERATURE AND A SUPERATMOSPHERIC PRESSURE, THE CONTENTS OF THE REACTOR ARE MAINTAINED IN A HIGHLY DISPERSED STATE, A SLURRY CONSISTING SUBSTANTIALLY OF VINYL FLUORIDE POLYMER AND WATER IS REMOVED FROM THE REACTOR AND THE VINYL FLUORIDE POLYMER RECOVERED FROM THE SLURRY, THE IMPROVEMENT COMPRISING INTRODUCING INTO THE REACTOR A MONO-OLEFIN OF FROM 3 TO 7 CARBON ATOMS TO THE EXTENT OF FROM ABOUT 10 TO LESS THAN 10,000 PARTS PER MILLION PARTS BY WEIGHT OF VINYL FLUORIDE.
Claim 2
Dependent Claim
106 words
IN A PROCESS FOR THE HOMOPOLYMERIZATION OF VINYL FLUORIDE WHEREIN VINYL FLUORIDE, WATER AND A WATER-SOLUBLE FREE RADICAL REACTION INITIATOR ARE INTRODUCED INTO A REACTOR MAINTAINED AT A CONSTANT TEMPERATURE AND A SUPERATMOSPHERIC PRESSURE, THE CONTENTS OF THE REACTOR ARE MAINTAINED IN A HIGHLY DISPERSED STATE, A SLURRY CONSISTING SUBSTANTIALLY OF VINYL FLUORIDE POLYMER AND WATER IS REMOVED FROM THE REACTOR AND THE VINYL FLUORIDE POLYMER RECOVERED FROM THE SLURRY, THE IMPROVEMENT COMPRISING INTRODUCING INTO THE REACTOR A MONO-OLEFIN OF FROM 3 TO 7 CARBON ATOMS TO THE EXTENT OF FROM ABOUT 10 TO LESS THAN 10,000 PARTS PER MILLION PARTS BY WEIGHT OF VINYL FLUORIDE.
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) | 1969-08-08 | 1970-02-07 | 1970-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-08 | 1974-02-07 | 1974-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-08 | 1978-02-07 | 1978-08-09 | $7700.00 | Window Closed / Lapsed |