US3476849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the phase separation spinning of yarns from fiber-forming polyparaphenylene oxides
Assignee: Akzo NV
•
Filing: 1967-02-27
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Granted: 1969-11-04
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Expires: 1987-02-27
Abstract
No abstract record available.
Inventors
- 👤 Johannes Aart Duiser
- 👤 Johannes Cornelis Rieke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:33
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/66; D01D; D01D1/00; D01D1/02; D01D5/00
Claims Analysis
Total Claims: 0
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US3356761A
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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) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |