US3692718A
Expired / Lapsed
US
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Gas phase polymerization of vinyl chloride
Assignee: Solvay SA
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Filing: 1970-06-22
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Granted: 1972-09-19
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Expires: 1990-06-22
Abstract
Abstract POLYVINYL CHLORIDE IS PREPARED BY CONTACTING GASEOUS VINYL CHLORIDE WITH A FREE RADICAL INITIATOR IN THE COMPLETE ABSENCE OF A LIQUID PHASE AND IN THE PRESENCE OF AN INERT SOLID, AT A TEMPERATURE BETWEEN ABOUT 40 AND 80*C. AND AT A PRESSURE ABOVE THE POLYVINYL CHLORIDE-GASEOUS VINYL CHLORIDE MODIFICATION POINT AND BELOW THE SATURATED VAPOR PRESSURE OF VINYL CHLORIDE.
Inventors
- 👤 Jean Pierre Golstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:48
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06; B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/36; B01J8/38; B01J8/382; C08F259/00; C08F259/02; C08F259/04; B01J2219/00; B01J2219/18; B01J2219/182; B01J2219/185; B01J2219/19; B01J2219/194; B01J2219/1941; B01J2219/1946; Y; Y10; Y10S; Y10S526/00; Y10S526/913
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |