US2745825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polyacrylonitrile
Assignee: CHEMISCHE WERKE HULZ AG
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Filing: 1953-05-15
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Granted: 1956-05-15
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Expires: 1973-05-15
Abstract
No abstract record available.
Inventors
- 👤 Wenning Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:52
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
40 words
PROCESS FOR THE PRODUCTION OF POLYACRYLONITRILE WHICH COMPRISES POLYMERIZING ACRYLONITRILE IN AQUEOUS DISPERSION AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 25* C. TO ABOUT 75* C. UNDER A SULFUR DIOXIDE PRESSURE OF FROM ABOUT 1 TO ABOUT 5 ATMOSPHERES.
Claim 2
Dependent Claim
40 words
PROCESS FOR THE PRODUCTION OF POLYACRYLONITRILE WHICH COMPRISES POLYMERIZING ACRYLONITRILE IN AQUEOUS DISPERSION AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 25* C. TO ABOUT 75* C. UNDER A SULFUR DIOXIDE PRESSURE OF FROM ABOUT 1 TO ABOUT 5 ATMOSPHERES.
References Cited (Backward Citations)
US2462354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-15 | 1959-11-14 | 1960-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-15 | 1963-11-14 | 1964-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-15 | 1967-11-14 | 1968-05-15 | $7700.00 | Window Closed / Lapsed |