US3491179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of acrylonitrile polymer fibers
Assignee: Wyeth Holdings LLC
•
Filing: 1967-01-03
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Granted: 1970-01-20
•
Expires: 1987-01-03
Abstract
No abstract record available.
Inventors
- 👤 Suresh Natvarlal Chinai
- 👤 Louis Herman Schwind
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:05
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01F11/00; D01F11/04; D01F11/06; D01F6/28; D01F6/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA690583A
Cited
GB711344A
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GB720380A
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US2948581A
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US3122412A
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US3083071A
Cited
US3066006A
Cited
US3193603A
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US3352626A
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US3389206A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |