Patent US3642971A successfully refreshed from Google Patents.
US3642971A
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US
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Heat stabilization of polyamide fibers bristles and foils
Assignee: Inventa AG fuer Forschung und Patentverwertung
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Filing: 1969-08-27
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Granted: 1972-02-15
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Expires: 1989-08-27
Abstract
Abstract A PROCESS FOR THE HEAT STABILIZATION OF POLYAMIDE FIBERS, BRISTLES AND FOILS WITH COPPER COMPOUND, AREOMATIC AMINES, AND ALKALI, HALIDES. THE COPPER COMPOUND AND AMINES ARE INCORPORAED IN THE STARTING MATERIALS PRIOR TO THE POLYMERIZATION. THE ALKALI HALIDES AND ANY OTHER COMPONENTS OF THE STABILIZER ARE ADDED ONLY UPON THE FORMATION OF FIBERS, BRISTLES OR FOILS, PRIOR TO STRETCHING.
Inventors
- 👤 Wolfgang Griehl
- 👤 Dieter Herion
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:50
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/22; D02J1/221; D01; D01F; D01F1/00; D01F1/02; D01F1/10; D01F6/00; D01F6/58; D01F6/60
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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |