US3772226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suspension polymerization of vinyl chloride
Assignee: Gulf Canada Ltd
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Filing: 1971-06-04
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Granted: 1973-11-13
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Expires: 1991-06-04
Abstract
Abstract AN IMPROVEMENT IN AQUEOUS SUSPENSION POLYMERIZATION OF VINYL CHLORIDE IS DISCLOSED WHEREIN PARTICULAR COPOLYMERS OF MALEIC ANHYDRIDE AND ALPHA-OLEFINS OF 6-20 CARBON ATOMS ARE USED, IN COMBINATION WITH KNOWN PROTECTIVE COLLOIDS, AS SUSPENDING AGENTS.
Inventors
- 👤 E Powell
- 👤 R Kitchen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:13
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06; C08F255/00
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |