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US3663677A
Expired / Lapsed
US
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Process for treating elastomeric fibers
Assignee: Celanese Corp
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Filing: 1970-07-13
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Granted: 1972-05-16
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Expires: 1990-07-13
Abstract
Abstract AN IMPROVED ELASTOMERIC FIBER AND METHOD FOR PRODUCING THE SAME ARE DISCLOSED AND CLAIMED WHICH METHOD COMPRISES STABILIZING THE CRYSTALLINE STRUCTURE OF A SPUN ELASTOMERIC FIBER BY TREATING THE FIBER WITH A SWELLING SOLVENT THEREOF WHILE MAINTAINING THE FIBER IN A STATE OF STRESS. PREFERABLY, THE FIBERS TREATED ARE SEGMENTED ELASTOMERIC COPOLYMERS. THESE PREFERRED ELASTOMERIC FIBERS ARE PREFERABLY POLYURETHANE-CONTAINING POLYMERS. THE RESULTING FIBERS HAVE IMPROVED PHYSICAL PROPERTIES PARTICULARLY AS MEASURED IN REDUCED PERMANENT SETTING CHARACTERISTICS.
Inventors
- 👤 Herbert W Keuchel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:23
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/392; D01; D01F; D01F6/00; D01F6/58; D01F6/70; D06M13/08; D06M13/10; D06M13/12; D06M13/127; D06M13/144; D06M13/325; D06M13/335
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |