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US5151406A
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Laminated superconductor
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1988-02-25
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Granted: 1992-09-29
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Expires: 2008-02-25
Abstract
Abstract A laminated ceramic superconductor which comprises at least two layers of ceramic superconductor and a stabilizing metal layer interposed between said ceramic superconductor layers, which has improved flexibility and increased critical current density.
Inventors
- 👤 Kazuo Sawada
- 👤 Kengo Okura
- 👤 Noriyuki Yoshida
- 👤 Satoshi Takano
- 👤 Kenji Miyazaki
- 👤 Noriki Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:31
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/20; H10N60/203; H10N60/80; H10N60/85; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/93; Y10S505/00; Y10S505/70; Y10S505/701; Y10S505/702; Y10S505/704; Y10S505/705; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
146 words
A laminated ceramic superconductor which comprises at least two layers of a ceramic superconductor having a layer perovskite crystal structure and a composition formula of ##EQU1## wherein M 1 is an element selected from the lanthanum series of elements M 2 is an element selected from the elements of the IA IIA, and IIIB groups, M 3 is an element selected from the group consisting of elements of the IB, IIB and IIIA groups and transition elements, M 4 is an element selected from the group consisting of oxygen, Boron, carbon, nitrogen, flourine, and sulfur, x is a number larger than zero and smaller than one, and y is a number not smaller than zero and smaller than four; and a stabilizing conductive metal layer, formed from a material selected from the group consisting of copper, aluminum, silver and gold, interposed between said ceramic superconductor layers.
Claim 2
Dependent Claim
146 words
A laminated ceramic superconductor which comprises at least two layers of a ceramic superconductor having a layer perovskite crystal structure and a composition formula of ##EQU1## wherein M 1 is an element selected from the lanthanum series of elements M 2 is an element selected from the elements of the IA IIA, and IIIB groups, M 3 is an element selected from the group consisting of elements of the IB, IIB and IIIA groups and transition elements, M 4 is an element selected from the group consisting of oxygen, Boron, carbon, nitrogen, flourine, and sulfur, x is a number larger than zero and smaller than one, and y is a number not smaller than zero and smaller than four; and a stabilizing conductive metal layer, formed from a material selected from the group consisting of copper, aluminum, silver and gold, interposed between said ceramic superconductor layers.
Claim 3
Dependent Claim
119 words
The laminated ceramic superconductor according to claim 1, wherein the ceramic superconductor has a composition formula of (M.sup.1.sub.1-x M.sup.2.sub.x).sub.2 M.sup.3 M.sup.4.sub.4-y (I) wherein M 1 is an element selected from the lanthanum series elements, M 2 is an element selected from the elements of the IA, IIA, and IIIB groups, M 3 is an element selected from the group consisting of elements of the IB, IIB and IIIA groups and transition elements, M 4 is an element selected from the group consisting of oxygen, boron, carbon, nitrogen, fluorine and sulfur, x is a number of larger than 0 (zero) and smaller than 1 (one), and y is a number not smaller than 0 (zero) and smaller than 4 (four).
Claim 4
Dependent Claim
53 words
The laminated ceramic superconductor according to claim 2, wherein the ceramic superconductor has a composition formula of (La 1-x Sr x ) 2 CuO 4 , (La 1-x Ba x ) 2 CuO 4 , (Y 1-x Sr x ) 2 CuO 4 or (Y 1-x Ba x ) 2 CuO 4 .
Claim 5
Dependent Claim
17 words
The laminated ceramic superconductor according to claim 1, wherein the stabilizing metal layer is made of copper.
Claim 6
Dependent Claim
13 words
The laminated ceramic superconductor according to claim 1, which is a sheet form.
Claim 7
Dependent Claim
13 words
The laminated ceramic superconductor according to claim 1, which is a wire form.
References Cited (Backward Citations)
FR1479481A
Cited
EP0207315A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-29 | 1996-03-30 | 1996-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-29 | 2000-03-30 | 2000-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-29 | 2004-03-30 | 2004-09-29 | $7700.00 | Window Closed / Lapsed |