US3645936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame-retardant regenerated cellulose filaments
Assignee: Akzo Nobel UK PLC
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Filing: 1970-05-05
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Granted: 1972-02-29
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Expires: 1990-05-05
Abstract
Abstract FLAME RETARDANT REGENERATED CELLULOSE FILAMENTS INCORPORATE BOTH TRIS (2,3 DIBROMOPROPYL) PHOSPHATE (TDBPP) AND A POLYMER MADE BY REACTING EXCESS AMMONIA WITH TETRAKISHYDROXYMETHYL PHOSPHONIUM CHLORIDE (THPC) OR THPC/UREA OR THPC/UREA/MELAMINE.
Inventors
- 👤 Brian C Gardner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:56
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/244; D06M13/282; D06M13/292; C; C08; C08G; C08G79/00; C08G79/02; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D01F2/10
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |