US2642418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polyacrylic nitrile
Assignee: CHEMISCHE WERKE HULS GmbH
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Filing: 1951-11-09
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Granted: 1953-06-16
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Expires: 1971-11-09
Abstract
No abstract record available.
Inventors
- 👤 Wenning Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:24
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
51 words
PROCESS FOR THE PRODUCTION OF POLYACRYLIC NITRILE BY POLYMERIZATION OF ACRYLIC NITRILE IN AQUEOUS DISPERSION IN THE PRESENCE OF WATER SOLUBLE REDOC CATALYSTS, CHARACTERIZED IN THAT THE DISPERSION IS MAINTAINED UNDER SUPERATMOSPHERIC PRESSURE AND AT A PH VALUE OF ABOUT 4 TO 5 SOLELY BY THE PRESENCE OF DISSOLVED CARBON DIOXIDE.
Claim 2
Dependent Claim
51 words
PROCESS FOR THE PRODUCTION OF POLYACRYLIC NITRILE BY POLYMERIZATION OF ACRYLIC NITRILE IN AQUEOUS DISPERSION IN THE PRESENCE OF WATER SOLUBLE REDOC CATALYSTS, CHARACTERIZED IN THAT THE DISPERSION IS MAINTAINED UNDER SUPERATMOSPHERIC PRESSURE AND AT A PH VALUE OF ABOUT 4 TO 5 SOLELY BY THE PRESENCE OF DISSOLVED CARBON DIOXIDE.
References Cited (Backward Citations)
US2486241A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-15 | 1956-12-15 | 1957-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-15 | 1960-12-15 | 1961-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-15 | 1964-12-15 | 1965-06-16 | $7700.00 | Window Closed / Lapsed |