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US3637620A
Expired / Lapsed
US
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Process for the polymerization of vinyl chloride
Assignee: CHATILLON ITALIANA FIBRE
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Filing: 1970-02-26
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Granted: 1972-01-25
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Expires: 1990-02-26
Abstract
Abstract BULK POLYMERIZATION OF VINYL CHLORIDE IN THE PRESENCE OF A CATALYTIC SYSTEM CONSISTING ESSENTIALLY OF AN ORGANIC HYDROPEROXIDE ACTIVATED BY AN ALCOHOLIC SOLUTION OF SULPHUR DIOXIDE AND AT LEAST ONE OXIDE OR HYDROXIDE OF AN ALKAI METAL OR OF MAGNESIUM OR MAGNESIUM SULPHITE, WHEREIN THE POLYMERIZATION PROCESS IS CONDUCTED CONTINOUSLY OR SEMI-CONTINOUSLY AT A TEMPERATURE HIGHER THAN 0*C.
Inventors
- 👤 Luigi Patron
- 👤 Alberto Moretti
- 👤 Renato Pasqualetto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:29
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |