Patent US4599256A successfully refreshed from Google Patents.
US4599256A
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Self-healing oxidation-resistant carbon structure
Assignee: Avcarb Material Solutions Inc
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Filing: 1984-04-09
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Granted: 1986-07-08
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Expires: 2004-04-09
Abstract
Abstract An oxidation resistant carbon-carbon composite (31) including a plurality of graphite fibers (13) within a carbonized (graphitized) matrix (14). A first material including boron (16) and a second material including silicon (18) are applied thereto. Heating the composite in the course of service use to a temperature at which the composite cracks enables the boron and silicon to combine to provide a borosilicate sealant of sufficiently low viscosity for sealing cracks in the composite.
Inventors
- 👤 Thomas Vasilos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:32
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/80; C04B41/81; C04B41/85; C04B41/86; C03; C03C; C03C14/00; C03C14/002; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B35/83; C04B41/45; C04B41/50; C04B41/5022; C03C2214/00; C03C2214/02; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24132; Y10T428/249921; Y10T428/249924; Y10T428/249928; Y10T428/249929; Y10T428/24993; Y10T428/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
90 words
An oxidation resistant carbon-carbon composite comprising: (a) plurality of graphite fibers therein and carbonized (graphitized) matrix, (b) a first material including boron disposed throughout said graphitized matrix, (c) a second material including silicon applied thereto as a coating on the exterior surfaces of the graphite fibers and graphitized matrix, (d) whereby heating said composite in the course of service use, to a temperature at which said composite cracks enables said boron and silicon to combine to provide a borosilicate sealant of sufficiently low viscosity for sealing cracks in said composite.
Claim 2
Dependent Claim
90 words
An oxidation resistant carbon-carbon composite comprising: (a) plurality of graphite fibers therein and carbonized (graphitized) matrix, (b) a first material including boron disposed throughout said graphitized matrix, (c) a second material including silicon applied thereto as a coating on the exterior surfaces of the graphite fibers and graphitized matrix, (d) whereby heating said composite in the course of service use, to a temperature at which said composite cracks enables said boron and silicon to combine to provide a borosilicate sealant of sufficiently low viscosity for sealing cracks in said composite.
Claim 3
Dependent Claim
21 words
Composite in accordance with claim 1 wherein said fibers are in layers and said first material is applied between said layers.
Claim 4
Dependent Claim
21 words
Composite in accordance with claim 1 wherein said second material is coated on exterior surfaces of the graphitized resin impregnated fiber.
Claim 5
Dependent Claim
13 words
Composite in accordance with claim 1 wherein said first material includes boron metal.
Claim 6
Dependent Claim
13 words
Composite in accordance with claim 1 wherein said first material includes boron carbide.
Claim 7
Dependent Claim
13 words
Composite in accordance with claim 1 wherein said second material includes silicon carbide.
Claim 8
Dependent Claim
14 words
Composite in accordance with claim 1 wherein said first material is particulate in form.
References Cited (Backward Citations)
US4164601A
Cited
US4515860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |