US3706828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wet spinning non-circular polyacrylonitrile fibers by utilizing circular orifices and sequential coagulation
Assignee: Badische Corp
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Filing: 1969-08-19
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Granted: 1972-12-19
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Expires: 1989-08-19
Abstract
Abstract A METHOD OF PRODUCING SYNTHETIC FIBERS HAVING TOUGH OUTER SKINS AND DOG-BONE OR OTHER NON-CIRCULAR CROSSSECTIONS WHICH COMPRISES SPINNING SAID FIBER AND SUBJECTING THE SPUN FIBER TO SEQUENTIAL COAGULATION TREATMENTS WHEREBY THE OUTER CORE IS COAGULATED AND SHRINKS TO A TOUGH SHELL, SURROUNDING THE INNER CORE WHICH IS INCOMPLETELY COAGULATED AND COLLAPSED. THE FIBERS MAY BE USED IN CONVENTIONAL TEXTILE MATERIALS.
Inventors
- 👤 Leonidas S Tzentis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:22
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |