US3737504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of crimped acrylonitrile base yarns with an isopropanol containing bath
Assignee: IND DE TEXTILES ARTIFICIELS ET
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Filing: 1971-04-22
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Granted: 1973-06-05
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Expires: 1991-04-22
Abstract
Abstract A PROCESS FO PRODUCING SYNTHETIC YARNS AND FIBERS CONTAINING AT LEAST 50% ACRYLONITRILE COMPRISING: SPINNING AN ACRYLONITRILE POLYMER BASE SLUTION INTO A COAGULANT BATH COMPRISING A SOLVENT FOR THE ACRYLONITRILE AND ISOPROPANOL, DRAWING THE SPUN FILAMENTS IN A SECOND BATH COMPRISING A SOLVENT FOR THE ACRYLONITRILE AND ISOPROPANOL, CUTTING THE WASHING THE FILAMENTS IN THE RELAXED STATE, IMMERSING THE FILAMENTS IN BOILING WATER WHILE IN A RELAXED STATE, ND DRYING THE FILAMENTS IN A RELAXED STATE. FILAMENTS HAVING A TIGHT REVERSIBLE CRIMP ARE PREPARED.
Inventors
- 👤 P Herrbach
- 👤 A Breton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:39
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01F6/28; D01F6/38
Claims Analysis
Total Claims: 0
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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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |