Patent US2399955A successfully refreshed from Google Patents.
US2628223A
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Polymerization of acrylonitrile to polymers of controlled molecular weight
Assignee: EIDP Inc
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Filing: 1949-02-09
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Granted: 1953-02-10
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Expires: 1969-02-09
Abstract
No abstract record available.
Inventors
- 👤 Richards John Cadwallader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:00
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/42; C08F2/00; C08F2/12; C08F2/16; C08F20/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A PROCESS FOR THE POLYMERIZATION OF ACRYLONITRILE TO A POLYMER HAVING A UNIFORM MOLECULAR WEIGHT WHICH COMPRISES FORMING AN AQUEOUS SOLUTION OF ACRYLONITRILE; DISSOLVING THEREIN A PERDISULFATE CATALYST AND AN ACTIVATOR COMPRISING A WATER-SOLUBLE SULFOXY REDUCING AGENT WHICH HAS A SULFUR ATOM HAVING A VALENCE NOT EXCEEDING 4; ADJUSTING THE PH OF THE RESULTANT SOLUTION BE-
Claim 2
Dependent Claim
56 words
A PROCESS FOR THE POLYMERIZATION OF ACRYLONITRILE TO A POLYMER HAVING A UNIFORM MOLECULAR WEIGHT WHICH COMPRISES FORMING AN AQUEOUS SOLUTION OF ACRYLONITRILE; DISSOLVING THEREIN A PERDISULFATE CATALYST AND AN ACTIVATOR COMPRISING A WATER-SOLUBLE SULFOXY REDUCING AGENT WHICH HAS A SULFUR ATOM HAVING A VALENCE NOT EXCEEDING 4; ADJUSTING THE PH OF THE RESULTANT SOLUTION BE-
References Cited (Backward Citations)
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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) | 1956-02-10 | 1956-08-11 | 1957-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-10 | 1960-08-11 | 1961-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-10 | 1964-08-11 | 1965-02-10 | $7700.00 | Window Closed / Lapsed |