Patent US3720536A successfully refreshed from Google Patents.
US3720536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of carbon fibers
Assignee: RTX Corp
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Filing: 1970-06-18
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Granted: 1973-03-13
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Expires: 1990-06-18
Abstract
Abstract A method of treating carbon fiber to improve its bonding characteristics in a resin matrix comprising heating the fiber to 1,000* -1,500* C and exposing the heated fiber to an atmosphere consisting essentially of nitrogen and 0.1-1.8 percent, by volume, of oxygen for a period of 0.1-60 seconds.
Inventors
- 👤 D Scola
- 👤 M Basche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:09
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/10; D01F11/12; D01F11/122; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
79 words
A method of improving the bonding characteristics of carbon fiber to a resin matrix without causing significant degradation in mechanical properties of the fiber comprising heating the fiber to a temperature of 1,000* to 1,500* C, exposing the heated fiber to a nitrogen atmosPhere for a period of time of from 0.1 to 60 seconds, said nitrogen atmosphere containing oxygen in the range of from 0.10 through 1.8 percent by volume, and bonding said fiber to a resin matrix.
Claim 2
Independent Claim
79 words
A method of improving the bonding characteristics of carbon fiber to a resin matrix without causing significant degradation in mechanical properties of the fiber comprising heating the fiber to a temperature of 1,000* to 1,500* C, exposing the heated fiber to a nitrogen atmosPhere for a period of time of from 0.1 to 60 seconds, said nitrogen atmosphere containing oxygen in the range of from 0.10 through 1.8 percent by volume, and bonding said fiber to a resin matrix.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the fiber is heated to a temperature range of 1,20* - 1,300* C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |