US4772502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preformed yarn useful in forming composite articles and process of producing same
Assignee: Across Co Ltd
•
Filing: 1987-07-29
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Granted: 1988-09-20
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Expires: 2007-07-29
Abstract
Abstract A preformed yarn useful in forming fiber-reinforced carbon composite articles is disclosed which includes a core of a multiplicity of inorganic reinforcing fibers, a mixed powder provided in the interstices between the fibers and including a finely divided carbonaceous binder pitch and a finely divided coke, and a flexible sleeve formed of a thermoplastic resin and surrounding the core.
Inventors
- 👤 Akimitsu Okura
- 👤 Toshoku Cho
- 👤 Takao Nakagawa
- 👤 Shimpei Gomi
- 👤 Takuya Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:43
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B35/83; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/237; Y10T428/249921; Y10T428/249924; Y10T428/249928; Y10T428/25; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/292; Y10T428/2929; Y10T428/2933; Y10T428/2964; Y10T428/2973; Y10T428/2978; Y10T428/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
54 words
A preformed yarn useful in forming composite articles, comprising: a core of a multiplicity of inorganic reinforcing fibers; a mixed powder provided in the interstices between said fibers and including a finely divided carbonaceous binder pitch and a finely divided coke; and a flexible sleeve formed of a thermoplastic resin and surrounding said core.
Claim 2
Dependent Claim
54 words
A preformed yarn useful in forming composite articles, comprising: a core of a multiplicity of inorganic reinforcing fibers; a mixed powder provided in the interstices between said fibers and including a finely divided carbonaceous binder pitch and a finely divided coke; and a flexible sleeve formed of a thermoplastic resin and surrounding said core.
Claim 3
Dependent Claim
25 words
A preformed yarn according to claim 1, wherein the weight ratio of said pitch to said coke is in the range of 1:9 to 9:1.
Claim 4
Dependent Claim
30 words
A preformed yarn according to claim 1, wherein the content of said inorganic reinforcing fibers is in the range of 5 70% based on the volume of the preformed yarn.
Claim 5
Dependent Claim
40 words
A preformed yarn according to claim 1, wherein said mixed powder further includes a finely divided metal powder capable of forming a metal carbide when the preformed yarn is subjected to conditions under which said coke and pitch are carbonized.
Claim 6
Dependent Claim
20 words
A preformed yarn according to claim 1, wherein said sleeve is in close contact with the periphery of said core.
Claim 7
Dependent Claim
41 words
A preformed yarn according to claim 1, wherein the outer periphery of said sleeve is provided with a plurality of longitudinally spaced apart, thin, annular, pressed portions so that said sleeve and said core are tightened together at the pressed portions.
References Cited (Backward Citations)
US3953637A
Cited
US4614678A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |