US2654731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization control of acrylonitrile
Assignee: EIDP Inc
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Filing: 1951-01-19
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Granted: 1953-10-06
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Expires: 1971-01-19
Abstract
No abstract record available.
Inventors
- 👤 Hugh T Patterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:59
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/42; C08F20/44; C08F2/00; C08F2/12; C08F2/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A PROCESS FOR THE POLYMERIZATION OF ACRYLONITRILE TO A POLYMER HAVING A UNIFORM HIGH MOLECULAR WEIGHT WHICH COMPRISES CARRYING OUT THE POLYMERIZATION IN THE PRESENCE OF A WATERSOLUBLE PERDISULFATE AS THE SOLE CATALYST IN A MEDIUM THE ACIDITY OF WHICH IS MAINTAINED, BY ADDING ACID DURING POLYMERIZATION, AT A SUBSTANTIALLY CONSTANT PH WHICH HAS A VALUE BETWEEN ABOUT 4.0 TO ABOUT 6.3.
Claim 2
Dependent Claim
62 words
A PROCESS FOR THE POLYMERIZATION OF ACRYLONITRILE TO A POLYMER HAVING A UNIFORM HIGH MOLECULAR WEIGHT WHICH COMPRISES CARRYING OUT THE POLYMERIZATION IN THE PRESENCE OF A WATERSOLUBLE PERDISULFATE AS THE SOLE CATALYST IN A MEDIUM THE ACIDITY OF WHICH IS MAINTAINED, BY ADDING ACID DURING POLYMERIZATION, AT A SUBSTANTIALLY CONSTANT PH WHICH HAS A VALUE BETWEEN ABOUT 4.0 TO ABOUT 6.3.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-05 | 1957-04-06 | 1957-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-05 | 1961-04-06 | 1961-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-05 | 1965-04-06 | 1965-10-06 | $7700.00 | Window Closed / Lapsed |