US3428468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Art of producing filamentary materials of cellulose ester
Assignee: Celanese Corp
•
Filing: 1964-12-28
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Granted: 1969-02-18
•
Expires: 1984-12-28
Abstract
No abstract record available.
Inventors
- 👤 Lawrence R Blake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:20
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D01F2/10; D01F1/00; D01F1/02; D01F1/10; D01F2/24; D01F2/28; D01F2/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2758339A
Cited
US2963455A
Cited
US2898348A
Cited
US2964484A
Cited
US3003978A
Cited
US3305378A
Cited
US3313639A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |