US3642745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Procedure for the polymerization and copolymerization of vinyl chloride
Assignee: Solvay SA
•
Filing: 1969-06-05
•
Granted: 1972-02-15
•
Expires: 1989-06-05
Abstract
Abstract VINYL CHLORIDE IS POLYMERIZED AND COPOLYMERIZED IN THE ABSENCE OF A DISPERSING AGENT AND INTHE PESENCE OF A DISPERSION OF AN INERT SOLID AND A CATALYST IN A LIQUID WHICH IS NOT A SOLVENT FOR THE MONOMERIC COMPOUNDS UNDERGOING POLYMERIZATION OR COPOLYMERIZATION, AT A PRESSURE AND BELOW THE SATURATED VAPOR PRESSURE OF THE MONOMERIC COMPOUNDS. CRUSTING ON THE POLYMERIZATION REACTOR IS AVOIDED AND A PRODUCT OF HIGH PURITY IS PRODUCED BY MEANS OF THE PRESENT PROCESS.
Inventors
- 👤 Jean Golstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:17
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06; C08F259/00; C08F259/02; C08F259/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |