Patent US4028488A successfully refreshed from Google Patents.
US4028488A
Expired / Lapsed
US
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Superconductors
Assignee: Imperial Metal Industries Kynoch Ltd
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Filing: 1975-01-16
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Granted: 1977-06-07
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Expires: 1995-01-16
Abstract
Abstract A mechanically strengthened intermetallic superconductor formed around filaments of one component of the superconductor in a matrix material. The selection of specified relative proportions for the components of the assembly leads to enhanced mechanical properties of the superconductor in the composite.
Inventors
- 👤 Ian Leitch McDougall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:23
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/20; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/884; Y10S505/887
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
85 words
A composite superconductor assembly comprising a plurality of filaments of one component of a superconductive intermetallic compound embedded in a matrix material of a material which is non-superconductive at 5° K, there being a layer of the superconductive compound on the filaments, characterised in that the filaments have a diameter in the range 0.0005 to 0.0020 cm, and the layer of superconductive compound has a thickness in the range 0.00005 to 0.0002 cm and the interfilament distance is less than the diameter of the filaments.
Claim 2
Dependent Claim
85 words
A composite superconductor assembly comprising a plurality of filaments of one component of a superconductive intermetallic compound embedded in a matrix material of a material which is non-superconductive at 5° K, there being a layer of the superconductive compound on the filaments, characterised in that the filaments have a diameter in the range 0.0005 to 0.0020 cm, and the layer of superconductive compound has a thickness in the range 0.00005 to 0.0002 cm and the interfilament distance is less than the diameter of the filaments.
Claim 3
Dependent Claim
106 words
A composite superconductor assembly comprising a plurality of filaments of one component of a superconductive intermetallic compound embedded in a matrix material of a material which is non-superconductive at 5° K, there being a layer of the superconductive compound on the filaments, characterised in that the filaments have a diameter in the range 0.0005 cm to 0.0020 cm, the layer of superconductive compound has a thickness in the range 0.00005 to 0.0002 cm and in that there is a cylindrical diffusion barrier located within the filament, so that there is an inner core and an outer sheath of the one component separated by the diffusion barrier.
Claim 4
Dependent Claim
106 words
A composite superconductor assembly comprising a plurality of filaments of one component of a superconductive intermetallic compound embedded in a matrix material of a material which is non-superconductive at 5° K, there being a layer of the superconductive compound on the filaments, characterised in that the filaments have a diameter in the range 0.0005 cm to 0.0020 cm, the layer of superconductive compound has a thickness in the range 0.00005 to 0.0002 cm and in that there is a cylindrical diffusion barrier located within the filament, so that there is an inner core and an outer sheath of the one component separated by the diffusion barrier.
Claim 5
Dependent Claim
35 words
A composite as claimed in claim 2 in which the filaments have a diameter in the range 0.0005 to 0.0015 cm and the superconductive compound has a thickness in the range 0.00005 to 0.0001 cm.
Claim 6
Dependent Claim
20 words
A composite as claimed in claim 2 in which the interfilament distance is less than the diameter of the filaments.
Claim 7
Dependent Claim
30 words
A composite as claimed in claim 2 in which the filaments are niobium filaments and in which the non-superconductive material is chosen from the group copper or a copper-tin alloy.
Claim 8
Dependent Claim
22 words
A composite as claimed in claim 2 in which some at least of the filaments have a core of a further metal.
Claim 9
Dependent Claim
18 words
A composite as claimed in claim 6 in which there are a plurality of metals in the core.
Claim 10
Dependent Claim
54 words
A composite as claimed in claim 2 in which the Poisson's ratio of the matrix material is less than the Poisson's ratio of the filament material, such that, in tension, the intermetallic compound is subjected to tension along three mutually perpendicular axes due to the tendency of the filament to shrink from the matrix.
Claim 11
Dependent Claim
35 words
A composite as claimed in claim 2 in which the filaments have a thickness in the range 0.0006 to 0.001 cm diameter, the superconductive intermetallic compound being in the range 0.00005 to 0.0001 cm thick.
Claim 12
Dependent Claim
27 words
A composite as claimed in claim 9 in which the ratio of the amount of matrix material to filament material is in the range 3:1 to 1:1.
References Cited (Backward Citations)
US3876473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |