US3776829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aminated carbon fibers
Assignee: Akzo NV
•
Filing: 1971-10-26
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Granted: 1973-12-04
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Expires: 1991-10-26
Abstract
Abstract CARBON FIBERS ARE REACTED WITH AMMONIA PLASMA TO FORM AMINO GROUPS ON THE SURFACE, USEFUL IN PREPARING CARBON FIBER-EPOXY RESIN COMPOSITE.
Inventors
- 👤 J Goan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:37
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/10; D01F11/16; D01F11/12; D01F11/127; D06; D06M; D06M10/00; D06M10/04; D06M10/06; D06M11/00; D06M11/58; D06M11/59; D06M11/60; D06M2101/00; D06M2101/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |