US3591705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superconductive devices and conductors therefor
Assignee: Balfour Beatty PLC
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Filing: 1968-11-19
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Granted: 1971-07-06
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Expires: 1988-11-19
Abstract
Abstract The critical current-carrying capacity of a superconductor strip is increased by folding at least one edge of the strip to form a fold which defines a lateral limit of the superconductor. The strip may be fractured at the fold and the edge portion discarded, or the folded-over portion may remain attached and lie in contact with the surface of the strip. In forming a superconductive cable, the fold is directed away from the return conductor.
Inventors
- 👤 Richard Grigsby
- 👤 Raymond Jeffrey Slaughier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:32
CPC Classifications
H; H01; H01B; H01B12/00; H10; H10N; H10N60/00; H10N60/01; H10N60/0128; H10N60/20; Y; Y02; Y02E; Y02E40/00; Y02E40/60; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/884
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
22 words
A superconductive cable as defined in claim 1 wherein each of the said strips is of a mechanically hard ductile superconductive metal.
Claim 2
Dependent Claim
17 words
A superconductive cable as defined in claim 1 wherein each of the said strips is of niobium.
Claim 3
Dependent Claim
137 words
A superconductive concentric power cable comprising inner and outer superconductors comprising respectively a first and a second strip of superconductive metal, each of which is longitudinally shaped into a tubular form with its edges overlapping each other, insulating means spacing the conductors apart from one another, and cooling meaNs for maintaining the temperature of each conductor at a value below its critical temperature, wherein at least the radially outer edge of the first strip is defined by a fracture formed by folding over an edge of a wider strip towards that surface of the first strip that faces radially inwardly and at least the radially inner edge of the second strip is defined by a fracture formed by folding over an edge of a wider strip towards that surface of the second strip that faces radially outwardly.
Claim 4
Dependent Claim
113 words
A superconductive concentric power cable as defined in claim 4 further comprising at least one intermediate conductor comprising two strips of superconductive metal, each longitudinally shaped into a tubular form with its edges overlapping one another, the outer strip of the intermediate conductor having at least its outer edge defined by a fracture formed by folding over an edge of a wider strip towards that surface of the outer strip that faces radially inwardly and the inner strip of the intermediate conductor having at least its inner edge defined by a fracture formed by folding over an edge of a wider strip towards that surface of the inner strip that faces radially outwardly.
Claim 5
Dependent Claim
70 words
A superconductive cable comprising two strips of superconductive metal, at least one edge of one of the strips having been folded in a direction away from the other strip to the extent that it lies in contact with the surface of the first strip, means for insulating the strips from one another, and means for maintaining the temperature of each of the strips at a value below its critical temperature.
Claim 6
Dependent Claim
22 words
A superconductive cable as defined in claim 6 wherein each of the said strips is of a mechanically hard ductile superconductive metal.
Claim 7
Dependent Claim
17 words
A superconductive cable as claimed in claim 6 wherein each of the said strips is of niobium.
Claim 8
Dependent Claim
127 words
A superconductive concentric power cable comprising inner and outer superconductors comprising respectively a first and a second strip of superconductive metal, each of which is longitudinally shaped into a tubular form with its edges overlapping each other, insulating means spacing the conductors apart from one another, and cooling means for maintaining the temperature of each conductor at a value below its critical temperature, wherein at least the radially outer edge of the first strip is folded radially inwardly to the extent that it lies in contact with the radially inner surface of the first strip, and at least the radially inner edge of the second strip is folded radially outwardly to the extent that it lies in contact with the radially outer surface of the second strip.
Claim 9
Dependent Claim
103 words
A superconductive concentric power cable as claimed in claim 9 further comprising at least one intermediate conductor comprising two strips of superconductive metal, each longitudinally shaped into a tubular form with its edges overlapping one another, the outer strip of the intermediate conductor having at least its outer edge folded radially inwardly to the extent that it lies in contact with the radially inner surface of the outer strip and the inner strip of the intermediate conductor having at least its inner edge folded radially outwardly to the extent that it lies in contact with the radially outer surface of the inner strip.
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |