US3943090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon fibre composites
Assignee: British Railways Board
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Filing: 1972-06-28
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Granted: 1976-03-09
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Expires: 1992-06-28
Abstract
Abstract A method of forming a composite carbon fibres and synthetic plastics material by embodying the fibres in a matrix of the synthetic plastics material. In the interfacial region of the carbon fibres and synthetic plastics material an elastomeric resin is provided which is compatible with the synthetic plastics material used for the matrix to minimise the tendency for cracks to initiate at the interface.
Inventors
- 👤 James A. Enever
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:10
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; C; C08; C08J; C08J5/00; C08J5/04; C08J5/0405; C08J5/042; C08J5/06; C08J5/10; C08J5/24; C08J5/241; C08J5/243; C08J2363/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
51 words
A method of forming a composite of carbon fibers and synthetic plastics material by embodying the fibers in a matrix of an epoxy resin material and including the provision in the interfacial region of the carbon fibers and epoxy material of reactive urethane polymer which is compatible with the epoxy material.
Claim 2
Independent Claim
51 words
A method of forming a composite of carbon fibers and synthetic plastics material by embodying the fibers in a matrix of an epoxy resin material and including the provision in the interfacial region of the carbon fibers and epoxy material of reactive urethane polymer which is compatible with the epoxy material.
Claim 3
Dependent Claim
41 words
A composite of carbon fibers embodied in a matrix of an epoxy resin material, the interfacial region between the carbon fibers and the epoxy resin material being composed of a reactive urethane polymer that is compatible with the epoxy resin material.
Claim 4
Dependent Claim
41 words
A composite of carbon fibers embodied in a matrix of an epoxy resin material, the interfacial region between the carbon fibers and the epoxy resin material being composed of a reactive urethane polymer that is compatible with the epoxy resin material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |