US4788050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing pitch-based carbon fibers
Assignee: Eneos Corp
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Filing: 1987-03-27
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Granted: 1988-11-29
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Expires: 2007-03-27
Abstract
Abstract In a process for producing carbon fibers from a carbonaceous pitch, the improvement characterized in that an end portion of infusiblized fiber or carbonized fiber to be first subjected to a carbonizing or graphitizing treatment and that of infusiblized fiber or carbonized fiber to be next subjected to the same treatment are bonded together using a composition comprising (a) at least one member selected from the group consisting of phenolic resins and pitches and (b) graphite powder, and the thus-bonded fibers are fed successively to a carbonizing apparatus or a graphitizing apparatus.
Inventors
- 👤 Takao Hirose
- 👤 Yoshio Sohda
- 👤 Kazuyoshi Okamoto
- 👤 Seiichi Uemura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:24
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/145
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
In a process for producing carbon fibers from a carbonaceous pitch, the improvement characterized in that a trailing end portion of infusibilized fiber or carbonized fiber to be first subjected to a carbonizing or graphitizing treatment and the leading end of infusibilized fiber or carbonized fiber to be next subjected to the same treatment are bonded together using a composition consisting essentially of (a) at least one member selected from the group consisting of phenolic resins and pitches and (b) graphite powder in an amount in the range of 10 to 90 parts by weight per 100 parts by weight of component (a); wherein said bonding is carried out prior to or subsequent to the infusibilization of said fibers, and the thus-bonded fibers are fed successively to a carbonizing apparatus or a graphitizing apparatus.
Claim 2
Dependent Claim
134 words
In a process for producing carbon fibers from a carbonaceous pitch, the improvement characterized in that a trailing end portion of infusibilized fiber or carbonized fiber to be first subjected to a carbonizing or graphitizing treatment and the leading end of infusibilized fiber or carbonized fiber to be next subjected to the same treatment are bonded together using a composition consisting essentially of (a) at least one member selected from the group consisting of phenolic resins and pitches and (b) graphite powder in an amount in the range of 10 to 90 parts by weight per 100 parts by weight of component (a); wherein said bonding is carried out prior to or subsequent to the infusibilization of said fibers, and the thus-bonded fibers are fed successively to a carbonizing apparatus or a graphitizing apparatus.
Claim 3
Dependent Claim
19 words
A process according to claim 1, wherein the bonding pitches range in softening point from 240° to 400° C.
Claim 4
Dependent Claim
14 words
A process according to claim 1 wherein said composition further comprises (c) a solvent.
Claim 5
Dependent Claim
12 words
A process according to claim 3 wherein said solvent is an alcohol.
Claim 6
Dependent Claim
12 words
A process according to claim 4 wherein said alcohol is ethyl alcohol.
References Cited (Backward Citations)
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US4335089A
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US4466949A
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US4548703A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |