Patent US3583956A successfully refreshed from Google Patents.
US3583956A
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Vinyl chloride polymers
Assignee: Imperial Chemical Industries Ltd
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Filing: 1968-09-09
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Granted: 1971-06-08
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Expires: 1988-09-09
Abstract
Abstract PROCESS FOR PRODUCING VINYL CHLORIDE COPOLYMERS HAVING A LOWER SOFTENING POINT THAN POLYVINYL CHLRIDE, COMPRISING INITIALLY POLYMERIZING VINYL CHLORIDE TO AT LEAST 40% CONVERSION, ADDING A DIFFERENT VINYL MONOMER IN AN AMOUNT LESS THAN THE REMAINING UNREACTED VINYL CHLORIDE, AND CONTINUING THE POLYMERIZATION AT A TEMPERATURE WHICH IS AT LEAST 5*C. HIGHER THAN THE FIRST POLYMERIZATION TEMPERATURE.
Inventors
- 👤 Bruce Robert Owen Pointer
- 👤 Alex Edward Bond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:27
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/02; C08F214/04; C08F214/06; C08F259/00; C08F259/02; C08F259/04
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |