US3582258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame-retardant acrylonitrile polymers
Assignee: Wyeth Holdings LLC
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Filing: 1969-07-25
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Granted: 1971-06-01
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Expires: 1989-07-25
Abstract
Abstract ACRYLIC FIBERS HAVING IMPROVED FLAME-RETARDANCY AND GOOD LUSTER COMPRISING AN ACRYLONITRILE POLYMER COMBINED WITH 2.0-15.0% OF AN AZIRIDINYLPHOSPHINE OXIDE OR SULFIDE BASED ON THE WEIGHT OF FIBER. SUCH FIBERS ARE MADE BY APPLYING A SOLUTION OF AN AZIRIDINYLPHOSPHINE OXIDE OR SULFIDE TO FIBERS OF ACRYLONITRILE POLYMER WHILE SUCH FIBERS ARE IN THE GEL STATE AND THEREAFTER HEATING THE TREATED GEL UNTIL THE AZIRIDINYLPHOSPHINE COMPOUND HAS CHEMICALLY COMBINDED WITH THE POLYMER. THE PREFERRED AZIRIDINYLPHOSPHINE COMPOUND USED IS TRIS-AZIRIDINYLPHOSPHINE OXIDE.
Inventors
- 👤 Denis Coleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:49
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/487; D01; D01F; D01F1/00; D01F1/02; D01F1/07; D01F6/00; D01F6/02; D01F6/18; D01F6/28; D01F6/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |