US2921046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing stable vinyl chloride polymers
Assignee: Shell Development Co
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Filing: 1953-09-28
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Granted: 1960-01-12
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Expires: 1973-09-28
Abstract
No abstract record available.
Inventors
- 👤 Arlman Evert Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:24
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06; C08K; C08K5/00; C08K5/01
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
65 words
A PROCESS FOR PREPARING POLYMERS OF VINYL CHLORIDE HAVING IMPROVED STABILITY TO HEAT WHICH COMPRISES ADDING TO AN AQUEOUS EMULSION CONTAINING MONOMERIC VINYL CHLORIDE AND A FREE RADICAL POLYMERIZATION CATALYST, FROM .005 MOL TO 8 MOL PER 100 MOL OF VINYL CHLORIDE OF A STABILIZING COMPOUND OF THE GROUP CONSISTING OF CUMENE, BENZYL CHLORIDE AND TRIPHENYLMETHANE AND THEN HEATING THE MIXTURE TO A POLYMERZING TEMPERATURE.
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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) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |