Patent US2962476A successfully refreshed from Google Patents.
US2962476A
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Polymerized alkyl vinyl ethers of improved stability
Assignee: GAF Chemicals Corp
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Filing: 1956-11-30
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Granted: 1960-11-29
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Expires: 1976-11-30
Abstract
No abstract record available.
Inventors
- 👤 Robert M Verburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:35
CPC Classifications
C; C08; C08F; C08F16/00; C08F16/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
IN THE PROCESS FOR THE POLYMERIZATION OF VINYL ALKYL ETHERS WHEREIN A VINYL ALKYL ETHER IS POLYMERIZED UNDER ANHYDROUS CONDITIONS BY THE ACTION OF A FRIEDEL-CRAFTS CONDENSATION CATALYST, THE IMPROVEMENT WHEREBY THE VINYL ALKYL ETHER POLYMER WHICH IS OBTAINED IS STABILIZED AGAINST HEAT DISCOLORATION, WHICH COMPRISES INCORPORATING IN THE MATERIAL BEING POLYMERIZED A MINOR EFFECTIVE STABILIZING AMOUNT OF A SEQUESTERING AGENT SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL SALTS OF PHOSPHORIC ACIDS AND ETHYLENE POLYAMINE POLYACETIC ACIDS.
Claim 2
Dependent Claim
78 words
IN THE PROCESS FOR THE POLYMERIZATION OF VINYL ALKYL ETHERS WHEREIN A VINYL ALKYL ETHER IS POLYMERIZED UNDER ANHYDROUS CONDITIONS BY THE ACTION OF A FRIEDEL-CRAFTS CONDENSATION CATALYST, THE IMPROVEMENT WHEREBY THE VINYL ALKYL ETHER POLYMER WHICH IS OBTAINED IS STABILIZED AGAINST HEAT DISCOLORATION, WHICH COMPRISES INCORPORATING IN THE MATERIAL BEING POLYMERIZED A MINOR EFFECTIVE STABILIZING AMOUNT OF A SEQUESTERING AGENT SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL SALTS OF PHOSPHORIC ACIDS AND ETHYLENE POLYAMINE POLYACETIC ACIDS.
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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) | 1963-11-29 | 1964-05-30 | 1964-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-29 | 1968-05-30 | 1968-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-29 | 1972-05-30 | 1972-11-29 | $7700.00 | Window Closed / Lapsed |