US4212906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of carbon/carbon composite material
Assignee: Dunlop Ltd
•
Filing: 1978-09-19
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Granted: 1980-07-15
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Expires: 1998-09-19
Abstract
Abstract In the production of all-carbon composite articles by the cracking of a hydrocarbon gas to deposit carbon on a fibrous carbon substrate the substrate is held in the furnace by a ram movable in the furnace to engage the substrate. The gas is introduced inside the annular substrate and evacuated at a position spaced laterally from the substrate so that the gas is forced to disperse through the substrate wall.
Inventors
- 👤 Ronald Fisher
- 👤 Norman Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:27
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/10; D01F11/12; D01F11/125; C; C23; C23C; C23C16/00; C23C16/04; C23C16/045; C23C16/44; C23C16/455
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
67 words
A method for the deposition of carbon on a fibrous compressible substrate to produce an all-carbon composite article, the method comprising locating the fibrous substrate in a furnace provided interiorly with a ram, bringing the ram into contact with the substrate so that the substrate is subjected to pressure by the ram and cracking a hydrocarbon gas in the furnace to deposit carbon on the pressurised substrate.
Claim 2
Independent Claim
67 words
A method for the deposition of carbon on a fibrous compressible substrate to produce an all-carbon composite article, the method comprising locating the fibrous substrate in a furnace provided interiorly with a ram, bringing the ram into contact with the substrate so that the substrate is subjected to pressure by the ram and cracking a hydrocarbon gas in the furnace to deposit carbon on the pressurised substrate.
Claim 3
Dependent Claim
50 words
A method as claimed in claim 1, wherein the substrate is annular and wherein the gas is admitted to and withdrawn from the furnace on opposite sides of the peripheral wall of the substrate so as to cause a forced dispersion of the gas through the material of the substrate.
Claim 4
Dependent Claim
27 words
A method as claimed in claim 2 wherein individual annular discs of fibrous material are stacked in the furnace in coaxial relation to form a tubular substrate.
Claim 5
Dependent Claim
45 words
A method as claimed in claim 2 wherein an elongated tubular substrate of fibrous material is located in the furnace, and after completion of the densification process the tubular body is removed from the furnace and parted along its length to form individual annular discs.
References Cited (Backward Citations)
US1986319A
Cited
US2817605A
Cited
US3748995A
Cited
US3944686A
Cited
US3970768A
Cited
US3981791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |