US4954479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite superconducting strand having a high critical temperature, and method of manufacture
Assignee: Alstom SA
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Filing: 1988-12-02
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Granted: 1990-09-04
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Expires: 2008-12-02
Abstract
Abstract A superconducting strand comprises a central superconducting filament (1), a covering (2) of oxide for ensuring sufficient oxygen pressure around the filament (1), a layer of cladding (3) made of aluminum, an alloy of copper and aluminum, or of stainless steel, a layer of cladding (4) made of niobium, of tantalum, or of vanadium, and an outer covering of copper (5).
Inventors
- 👤 Patrick Dubots
- 👤 Denis Legat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:11
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/20; H10N60/203; H10N60/01; H10N60/0268; H10N60/0801; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/884; Y10S505/887; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49014
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
145 words
A composite superconducting strand having a high critical temperature comprising a filament of sintered powder of superconducting oxide and an outer covering of copper, and additionally comprising around said filament, and in order: an inner covering or an metallic oxide which is inert relative to said superconducting oxide and which is selected in such a manner as to ensure sufficient oxygen partial pressure around said filament for the oxygen of the superconducting oxide to be maintained therein; a first layer of cladding made of a material which is poorly permeable to oxygen and which is selected from the group consisting of aluminum, an alloy of copper and aluminum, and stainless steel; and a second layer of cladding made of a material acting as a diffusion barrier to the copper of said outer covering and is selected from the group consisting of niobium, tantalum and vanadium.
Claim 2
Dependent Claim
145 words
A composite superconducting strand having a high critical temperature comprising a filament of sintered powder of superconducting oxide and an outer covering of copper, and additionally comprising around said filament, and in order: an inner covering or an metallic oxide which is inert relative to said superconducting oxide and which is selected in such a manner as to ensure sufficient oxygen partial pressure around said filament for the oxygen of the superconducting oxide to be maintained therein; a first layer of cladding made of a material which is poorly permeable to oxygen and which is selected from the group consisting of aluminum, an alloy of copper and aluminum, and stainless steel; and a second layer of cladding made of a material acting as a diffusion barrier to the copper of said outer covering and is selected from the group consisting of niobium, tantalum and vanadium.
Claim 3
Dependent Claim
65 words
A superconducting composite strand according to claim 1, wherein the oxide of said inner covering is selected from the group consisting of: an oxide of barium, alumina, an oxide of silver, e.g. Ag 2 O or Ag 2 O 2 , magnesia, zirconia, yttrium zirconium oxide, calcium oxide, and an oxide of the type Y 2 BaCuO 3 , on their own or mixed together.
References Cited (Backward Citations)
EP0285169A2
Cited
EP0310182A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |