Patent US3640942A successfully refreshed from Google Patents.
US3640942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of delustred nylon filaments
Assignee: Akzo Nobel UK PLC
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Filing: 1969-05-02
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Granted: 1972-02-08
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Expires: 1989-05-02
Abstract
Abstract POLYAMIDE FILAMENTS WHICH ARE BOTHE DELUSTRED AND RESISTANT TO ACID DYES, COMPRISING AN INTIMATE BLEND OF A SUBSTITUTED CO-POLYAMIDE HAVING COVALENTLY BOUND ANIONIC SULPHONATE GROUPS AND A POLYAMIDE, IN WHICH IS DISPERSED TITANIUM DIOXIDE PARTICLES.
Inventors
- 👤 Edward Crampsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:30
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/04; C; C08; C08L; C08L77/00; C08L2205/00; C08L2205/02
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |