Patent US5114635A successfully refreshed from Google Patents.
US5114635A
Expired / Lapsed
US
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Process for producing carbon material and carbon/carbon composites
Assignee: Kawasaki Heavy Industries Ltd
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Filing: 1988-12-28
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Granted: 1992-05-19
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Expires: 2008-12-28
Abstract
Abstract A carbon/carbon composites is produced by impregnating a tow of carbon filaments with a carbonaceous pitch, placing the impregnated tow in an open container, then subjecting it to a heat treatment under hot isostatic pressing.
Inventors
- 👤 Yoshio Sohda
- 👤 Yasuzi Ido
- 👤 Toshinori Nakamura
- 👤 Takeshi Suemitsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:29
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B35/83
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
103 words
A process for producing a carbon material, which comprises placing a carbonaceous pitch in an open container, subjecting the pitch to a heat treatment under hot isostatic pressing in the open container, the heat treatment performed under an inert gas pressure and resulting in gas evolution, and controlling the discharge of said gas evolved by the heat treatment by an exhaust mechanism capable of continuously controlling and exhausting said gas evolved during the hot isostatic pressing such that in said gas evolved, evolution rates for H 2 and CH 4 each do not exceed 10 mol/hr per 100 grams of said carbonaceous pitch.
Claim 2
Dependent Claim
103 words
A process for producing a carbon material, which comprises placing a carbonaceous pitch in an open container, subjecting the pitch to a heat treatment under hot isostatic pressing in the open container, the heat treatment performed under an inert gas pressure and resulting in gas evolution, and controlling the discharge of said gas evolved by the heat treatment by an exhaust mechanism capable of continuously controlling and exhausting said gas evolved during the hot isostatic pressing such that in said gas evolved, evolution rates for H 2 and CH 4 each do not exceed 10 mol/hr per 100 grams of said carbonaceous pitch.
Claim 3
Dependent Claim
113 words
A process for producing a carbon/carbon composite which process comprises impregnating a tow of carbon filaments with a carbonaceous pitch, placing the impregnated tow in an open container, subjecting the tow to a heat treatment under isostatic pressing in the open container, the heat treatment performed under an inert gas pressure and resulting in gas evolution, and controlling the discharge of said gas evolved by the heat treatment by an exhaust mechanism capable of continuously controlling and exhausting said gas evolved during the hot isostatic pressing such that in said gas evolved, evolution rates for H 2 and CH 4 each do not exceed 10 mol/hr per 100 gram of said carbonaceous pitch.
Claim 4
Dependent Claim
113 words
A process for producing a carbon/carbon composite which process comprises impregnating a tow of carbon filaments with a carbonaceous pitch, placing the impregnated tow in an open container, subjecting the tow to a heat treatment under isostatic pressing in the open container, the heat treatment performed under an inert gas pressure and resulting in gas evolution, and controlling the discharge of said gas evolved by the heat treatment by an exhaust mechanism capable of continuously controlling and exhausting said gas evolved during the hot isostatic pressing such that in said gas evolved, evolution rates for H 2 and CH 4 each do not exceed 10 mol/hr per 100 gram of said carbonaceous pitch.
Claim 5
Dependent Claim
44 words
A process as set forth in claim 1 or 2, wherein said heat treatment is performed at a temperature in the range of 100° C. to 3,000° C. and the inert gas pressure is in the range of 50 to 10,000 kg/cm 2 .
Claim 6
Dependent Claim
41 words
A process as set forth in claim 1 or claim 2, wherein under said conditions the evolution rates of H 2 and CH 4 in evolved gases each do not exceed 5.0 mol/hr per 100 grams of the starting carbonaceous pitch.
Claim 7
Dependent Claim
28 words
A process as set forth in claim 2, wherein the volume content of the carbon filaments in the carbon/carbon composites is in the range of 5 to 70%.
Claim 8
Dependent Claim
34 words
A process as set forth in claim 1 or 2, wherein said heat treatment is performed in the presence of a member selected from the group consisting of refractory fibers, iron and iron alloys.
Claim 9
Dependent Claim
14 words
A process as set forth in claim 1 further comprising carbonizing the carbon material.
Claim 10
Dependent Claim
14 words
A process as set forth in claim 1 further comprising graphitizing the carbon material.
Claim 11
Dependent Claim
14 words
A process as set forth in claim 2 further comprising carbonizing the carbon/carbon composite.
Claim 12
Dependent Claim
14 words
A process as set forth in claim 2 further comprising graphitizing the carbon/carbon composite.
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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) | 1995-05-19 | 1995-11-18 | 1996-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-19 | 1999-11-18 | 2000-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-19 | 2003-11-18 | 2004-05-19 | $7700.00 | Window Closed / Lapsed |