Patent US5212491A successfully refreshed from Google Patents.
Patent US3399260A successfully refreshed from Google Patents.
US3399260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of acrylonitrile polymer fibers
Assignee: Japan Exlan Co Ltd
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Filing: 1964-05-27
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Granted: 1968-08-27
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Expires: 1984-05-27
Abstract
No abstract record available.
Inventors
- 👤 Nakagawa Kazumi
- 👤 Tsutsui Nobuhiro
- 👤 Tsuge Junji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:15
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01F6/28; D01F6/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2697023A
Cited
US2948581A
Cited
US2984912A
Cited
US3037240A
Cited
US3052512A
Cited
US3101245A
Cited
US3180913A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-27 | 1972-02-26 | 1972-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-27 | 1976-02-26 | 1976-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-27 | 1980-02-26 | 1980-08-27 | $7700.00 | Window Closed / Lapsed |