US4975262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three dimensional woven fabrics of pitch-derived carbon fibers
Assignee: Petoca Ltd
•
Filing: 1989-03-06
•
Granted: 1990-12-04
•
Expires: 2009-03-06
Abstract
Abstract Three dimensional woven fabrics containing bent parts of a small radius of curvature which bent parts comprise easily graphitized pitch-derived carbon fibers obtained by thermosetting treatment and light carbonization treatment carried out after melt-spinning of high softening point pitch and having a tensile strength of 15 250 Kgf/mm 2 , an elongation of 0.5-8.0% and modulus of elasticity of 400-40,000 Kgf/mm 2 and a capability of increasing both of their tensile strength and modulus of elasticity to 1.1 times or greater than the above-mentioned values by additional heat treatment carried out under a relaxed state to have a tensile strength of 150 Kgf/mm 2 or greater and a modulus of elasticity of 40,000 Kgf/mm 2 or greater. They are superior in abrasion resistance, flexion-resisting property and scratch-resisting property and useful as one component of fiber composite materials in reinforcing plastics, metals, cements, ceramics, carbon materials, etc.
Inventors
- 👤 Yoshinori Suto
- 👤 Hideyuki Nakajima
- 👤 Toshiyuki Ito
- 👤 Sanji Arisawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:18
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/145
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
45 words
A three dimensional woven fabric containing bent portions having a radius of curvature of 4 mm or less, wherein the directions of three components yarns are essentially mutually perpendicular to each other and wherein the said bent portions comprise easily graphitizable, pitch-derived, lightly carbonized fibers.
Claim 2
Dependent Claim
45 words
A three dimensional woven fabric containing bent portions having a radius of curvature of 4 mm or less, wherein the directions of three components yarns are essentially mutually perpendicular to each other and wherein the said bent portions comprise easily graphitizable, pitch-derived, lightly carbonized fibers.
Claim 3
Dependent Claim
53 words
A three dimensional woven fabric containing bent portions having a radius curvature of 4 mm or less, wherein the directions of three component yarns are essentially mutually perpendicular to each other and wherein the said bent portions comprise pitch-derived carbon fibers having a modulus of elasticity of at least 40,000 Kgf/mm 2 .
Claim 4
Dependent Claim
53 words
A three dimensional woven fabric containing bent portions having a radius curvature of 4 mm or less, wherein the directions of three component yarns are essentially mutually perpendicular to each other and wherein the said bent portions comprise pitch-derived carbon fibers having a modulus of elasticity of at least 40,000 Kgf/mm 2 .
Claim 5
Dependent Claim
130 words
A three dimensional woven fabric produced by the process comprising: (a) lightly carbonizing pitch-derived thermoset fibers so as to give a tensile strength of 15 to 250 Kgf/mm 2 , an elongation of 0.5 to 8.0% and a modulus of elasticity of between 400 and 40,000 Kgf/mm 2 , (b) weaving a three dimensional woven fabric containing bent portions having a radius of curvature of 4 mm or less, wherein the directions of three component yarns are essentially mutually perpendicular to each other and wherein the said bent portions comprise said pitch-derived, lightly carbonized fibers, and (c) heat treating said woven fabric at a temperature higher than the lightly carbonizing temperature in order that the pitch-derived carbon fibers have a modulus of elasticity of at least 40,000 Kgf/mm 2 .
Claim 6
Dependent Claim
130 words
A three dimensional woven fabric produced by the process comprising: (a) lightly carbonizing pitch-derived thermoset fibers so as to give a tensile strength of 15 to 250 Kgf/mm 2 , an elongation of 0.5 to 8.0% and a modulus of elasticity of between 400 and 40,000 Kgf/mm 2 , (b) weaving a three dimensional woven fabric containing bent portions having a radius of curvature of 4 mm or less, wherein the directions of three component yarns are essentially mutually perpendicular to each other and wherein the said bent portions comprise said pitch-derived, lightly carbonized fibers, and (c) heat treating said woven fabric at a temperature higher than the lightly carbonizing temperature in order that the pitch-derived carbon fibers have a modulus of elasticity of at least 40,000 Kgf/mm 2 .
Claim 7
Dependent Claim
134 words
A process for producing a three dimensional woven fabric, according to claim 2, comprising, (a) lightly carbonizing pitch-derived thermoset fibers so as to give a tensile strength of 15 to 250 Kgf/mm 2 , an elongation of 0.5 to 8.0% and a modulus of elasticity of between 400 and 40,000 Kgf/mm 2 , (b) weaving a three dimensional woven fabric containing bent portions having a radius of curvature of 4 mm or less, wherein the directions of three component yarns are essentially mutually perpendicular to each other and wherein the said bent portions comprise said pitch-derived, lightly carbonized fibers, and (c) heat treating said woven fabric at a temperature higher than the lightly carbonizing temperature in order that the pitch-derived carbon fibers have a modulus of elasticity of at least 40,000 Kgf/mm 2 .
References Cited (Backward Citations)
US3664900A
Cited
US4341830A
Cited
US4314981A
Cited
US4351816A
Cited
US4589974A
Cited
GB2118569A
Cited
US4518482A
Cited
US4576810A
Cited
US4519290A
Cited
JPS61167019A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-03 | 1994-06-04 | 1994-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-03 | 1998-06-04 | 1998-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-03 | 2002-06-04 | 2002-12-04 | $7700.00 | Window Closed / Lapsed |