US3733386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing acrylic synthetic fibers improved in the hydrophilicity
Assignee: Wyeth Holdings LLC
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Filing: 1971-04-13
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Granted: 1973-05-15
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Expires: 1991-04-13
Abstract
Abstract A PROCESS FOR MAKING ACRYLIC FIBERS MORE HYDROPHILIC BY WET-SPINNING AN ACRYLONITRILE POLYMER SOLUTION TO FORM A WET-GEL FIBER, STRETCHING THE WET-GEL FIBER, CROSSLINKING THE WET-GEL FIBER, HYDROLYZING THE CROSSLINKED WET-GEL FIBER OPTIONALLY TREATING THE HYDROLYZED CROSSLINKED WET-GEL FIBER WITH AN AQUEOUS SOLUTION OF AN AMMONIUM OR METAL SALT TO IMPROVE ANTI-STATIC POPERTIES, AND THEREAFTER DRYING THE FIBER.
Inventors
- 👤 K Shimoda
- 👤 T Sumi
- 👤 Y Mochida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:04
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)
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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |