US3767755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing brilliant acrylic fibers of a noncircular crosssection
Assignee: Wyeth Holdings LLC
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Filing: 1971-10-26
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Granted: 1973-10-23
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Expires: 1991-10-26
Abstract
Abstract RELATES TO MAKING BRILLIANT NON-ROUND ACRYONITRILE POLYMER FIBERS HAVING SMOOTH SURFACES BY WET-SPINNING AN INORGANIC SOLVENT SOLUTION OF A POLYMER OF AT LEAST 85% ACRYLONITRILE CONTAINING 5-15% OF A DI(LOWER ALKYL) ACRYLAMIDE OR A DI(LOWER ALKYL) METHACRYLAMIDE. PREFERABLY, THE WET GEL FIBER SO PRODUCED IS TREATED WITH ACETONE AFTER WATER WASHING AND PRIOR TO STRETCHING.
Inventors
- 👤 K Takeya
- 👤 K Tanashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:30
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01D; D01D5/00; D01D5/253; D01F11/00; D01F11/04; D01F11/06; D01F6/28; D01F6/38
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |