Patent US2219623A successfully refreshed from Google Patents.
Patent US3476849A successfully refreshed from Google Patents.
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
•
Granted: 1969-11-04
•
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 18:58
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/66; D01D; D01D1/00; D01D1/02; D01D5/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2695835A
Cited
US2824780A
Cited
US3029226A
Cited
US2820770A
Cited
US2996474A
Cited
US3037956A
Cited
US2953818A
Cited
US2965437A
Cited
US3221080A
Cited
US3342892A
Cited
US3373226A
Cited
US3356761A
Cited
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 |