US3746506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon fiber treatment
Assignee: National Research Development Corp UK
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Filing: 1971-09-22
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Granted: 1973-07-17
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Expires: 1991-09-22
Abstract
Abstract THE ADHESION OF CARBON FIBERS TO THE MATRIX IN WHICH THEY ARE INCORPORATED IS IMPROVED BY IMMERSING THE CARBON FIBERS IN AN AQUEOUS SOLUTION OF HYPOCHLOROUS ACID PREFERABLY CONTAINING FROM 1.0% TO 3.0% BY WEIGHT OF AVAILABLE CHLORINE, HAVING A PH OF FROM 3.0 TO 7.5, PARTICULARLY FROM 4.0 TO 6.0
Inventors
- 👤 I Aitken
- 👤 R Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:46
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/10; D01F11/12; D01F11/121
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |