Patent US4320107A successfully refreshed from Google Patents.
US4320107A
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Process for producing carbon fibers
Assignee: SANKO GAS CHEMICAL Co Ltd
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Filing: 1979-11-23
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Granted: 1982-03-16
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Expires: 1999-11-23
Abstract
Abstract A fibrous carbon is prepared by dissolving coal in a hydrocarbon solvent by heating under hydrogen pressure, by subjecting to melt spinning a solvent-refined coal obtained by successively removing insoluble residues and the solvent from the resultant solution, by making the fiber thus obtained non-fusible, and then by subjecting same to carbonization. The melt spinning may be effected by mixing a highly aromatic bituminous substance with the solvent refined coal. Alternatively, the solvent-refined coal may be pretreated prior to melt spinning by extracting it with a non-aromatic solvent to remove soluble components therefrom.
Inventors
- 👤 Mikio Oyabu
- 👤 Kenji Fukuda
- 👤 Keiichi Hirata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:28
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/145; D01F9/15
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
115 words
A process for producing carbon fibers which comprises: (a) providing as a starting material a solid solvent-refined coal having a softening point of from 200° C. to 250° C. and an insolubles content of 0.5% by weight or less, said solid solvent-refined coal being obtained by hydrogenating coal in a hydrocarbon solvent at a temperature of 300°-500° C. under a hydrogen pressure of 3-300 Kg/cm 2 and eliminating the hydrocarbon solvent; (b) subjecting said solvent-refined coal to melt spinning to form a fiber; (c) heating said fiber in air at a rate of 3-10° C./minute to render said fiber non-fusible; and (d) carbonizing said non-fusible fiber in an inert atmosphere to form said carbon fiber.
Claim 2
Dependent Claim
115 words
A process for producing carbon fibers which comprises: (a) providing as a starting material a solid solvent-refined coal having a softening point of from 200° C. to 250° C. and an insolubles content of 0.5% by weight or less, said solid solvent-refined coal being obtained by hydrogenating coal in a hydrocarbon solvent at a temperature of 300°-500° C. under a hydrogen pressure of 3-300 Kg/cm 2 and eliminating the hydrocarbon solvent; (b) subjecting said solvent-refined coal to melt spinning to form a fiber; (c) heating said fiber in air at a rate of 3-10° C./minute to render said fiber non-fusible; and (d) carbonizing said non-fusible fiber in an inert atmosphere to form said carbon fiber.
Claim 3
Dependent Claim
33 words
A process according to claim 1 in which said heating to render said fiber non-fusible is effected at a temperature 60° to 80° C. higher than the softening point of said solvent-refined coal.
References Cited (Backward Citations)
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US3629379A
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US3767741A
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US4146576A
Cited
US4055583A
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US4210517A
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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) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |