Patent US4923314A successfully refreshed from Google Patents.
Patent US3723150A successfully refreshed from Google Patents.
US3723150A
Expired / Lapsed
US
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Surface modification of carbon fibers
Assignee: Celanese Corp
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Filing: 1970-08-20
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Granted: 1973-03-27
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Expires: 1990-08-20
Abstract
Abstract A CONTINUOUS PROCESS IS PROVIDED FOR MODIFYING THE SURFACE CHARACTERISTICS OF A CARBONACEOUS FIBROUS MATERIAL (EITHER AMORPHOUS CARBON OR GRAPHIC CARBON) AND TO THEREBY FACILICATE ENHANCED ADHESION BETWEEN THE FIBROUS MATERIAL AND A MATRIX MATERIAL. THE FIBROUS MATERIAL IS CONTINUOUSLY PASSED THROUGH A HEATING ZONE CONTAING GASEOUS CARBON DIOXIDE UNDER CONDITIONS FOUND SUITABLE FOR BRINGING ABOUT THE DESIRED SURFACE MODIFICATION. COMPOSITE ARTICLES OF ENHANCED INTERLAMINAR SHEAR STRENGTH MAY BE FORMED BY INCORPORATING THE FIBERS MODIFIED IN ACCORDANCE WITH THE PRESENT PROCESS IN A RESINOUS MATRIX MATERIAL.
Inventors
- 👤 V Rao
- 👤 M Druin
- 👤 G Ferment
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:31
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/06; D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/20; D01F9/21; D01F9/22; Y; Y10; Y10S; Y10S264/00; Y10S264/19
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |