Patent US1827571A successfully refreshed from Google Patents.
US3752782A
Expired / Lapsed
US
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Stabilized polyacrylonitrile compositions and method of forming same
Assignee: Celanese Corp
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Filing: 1971-04-22
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Granted: 1973-08-14
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Expires: 1991-04-22
Abstract
Abstract A METHOD OF FORMING STABILIZED POLYACRYLONITRILE COMPOSITIONS WHICH ARE PARTICULARLY SUITED FOR THE SPINNING OF POLYACRYLONITRILE FIBERS AND FILMS AND THE COMPOSITIONS PRODUCED THEREBY WHEREIN ACRYLONITRILE POLYMERS CONTAINING AT LEAST 85 PERCENT ACRYLONITRILE ARE DISSOLVED IN A SOLVENT CONTAINING AN UNSATURATED HYDROCARBON AS A COLOR STABILIZER, WHICH SOLVENT IS ACETONITRILE OR AN ACETONITRILE/WATER MIXTURE. PREFERABLY, THE SOLVENT AND POLYMER ARE PURGED WITH NITROGEN AND THE PH OF THE SOLVENT IS ADJUSTED TO ABOUT 6.0-7.0.
Inventors
- 👤 D Thompson
- 👤 M Ensley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:49
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |