Patent US5232903A successfully refreshed from Google Patents.
US5232903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxide superconducting device having uniform oxygen concentration
Assignee: Semiconductor Energy Laboratory Co Ltd
•
Filing: 1991-03-13
•
Granted: 1993-08-03
•
Expires: 2011-03-13
Abstract
Abstract A superconducting device has an oxide superconducting material with a passivation or blocking film formed on its surface. The film helps to maintain a uniform oxygen concentration of the superconducting material through its thickness. The superconducting material is thus superconductive throughout its cross-section, and particularly in the vicinity of the surface bearing the film.
Inventors
- 👤 Shunpei Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:22
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0661; H10N60/0716; H10N60/0912; H10N60/0941; Y; Y10; Y10S; Y10S505/00; Y10S505/70; Y10S505/701; Y10S505/725; Y10S505/739
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
42 words
A superconducting device comprising an oxide superconducting material and a passivation film formed on a surface of said superconducting material, wherein said material exhibits superconductivity at said surface or in its vicinity as well as in a bulk portion of said material.
Claim 2
Dependent Claim
42 words
A superconducting device comprising an oxide superconducting material and a passivation film formed on a surface of said superconducting material, wherein said material exhibits superconductivity at said surface or in its vicinity as well as in a bulk portion of said material.
Claim 3
Dependent Claim
13 words
The device of claim 1 wherein said passivation film is 10 Å-2 μthick.
Claim 4
Dependent Claim
62 words
The device of claim 1 wherein said superconducting material is represented by a general formula: (A.sub.1-x B.sub.x).sub.y Cu.sub.z O.sub.w, where 0<x<1, 2<y<4, 1<z<4 and 4<w<10, A is one or more elements selected from the group consisting of Sc, Y, lanthanides and actinides and B is one or more elements selected from the group consisting of Be, Mg, Ca, Sr, Ba and Ra.
Claim 5
Dependent Claim
80 words
A superconducting device, comprising an oxide superconducting material having a bulk portion and a surface, a passivation film formed on said surface of said superconducting material, said passivation film comprising a material selected from the group consisting of aluminum oxide, titanium oxide, copper oxide, barium oxide, yttrium oxide, silicon oxide, germanium oxide, silicon nitride and germanium nitride, wherein said superconducting material exhibits superconductivity at said surface or in its vicinity as well as in said bulk portion of said material.
Claim 6
Dependent Claim
80 words
A superconducting device, comprising an oxide superconducting material having a bulk portion and a surface, a passivation film formed on said surface of said superconducting material, said passivation film comprising a material selected from the group consisting of aluminum oxide, titanium oxide, copper oxide, barium oxide, yttrium oxide, silicon oxide, germanium oxide, silicon nitride and germanium nitride, wherein said superconducting material exhibits superconductivity at said surface or in its vicinity as well as in said bulk portion of said material.
Claim 7
Dependent Claim
32 words
A superconducting device comprising an oxide superconducting material and a passivation film formed on a surface of said superconducting material, wherein an oxygen concentration of said material is uniform through its thickness.
Claim 8
Dependent Claim
32 words
A superconducting device comprising an oxide superconducting material and a passivation film formed on a surface of said superconducting material, wherein an oxygen concentration of said material is uniform through its thickness.
Claim 9
Dependent Claim
49 words
A superconducting device comprising a pair of superconducting films comprising an oxide superconducting material and a blocking film interposed between said pair, said blocking film capable of passing a tunneling current therethrough, wherein a concentration of oxygen in said superconducting material is uniform through thickness of said superconducting films.
Claim 10
Dependent Claim
49 words
A superconducting device comprising a pair of superconducting films comprising an oxide superconducting material and a blocking film interposed between said pair, said blocking film capable of passing a tunneling current therethrough, wherein a concentration of oxygen in said superconducting material is uniform through thickness of said superconducting films.
Claim 11
Dependent Claim
13 words
The device of claim 6 wherein said blocking film is 10-50 Å thick.
Claim 12
Dependent Claim
65 words
A superconducting device comprising a pair of superconducting films made of an oxide superconducting material and a blocking film interposed between said pair, said blocking film capable of passing a tunneling current therethrough, wherein said blocking film comprises a material selected from the group consisting of aluminum oxide, titanium oxide, copper oxide, barium oxide, yttrium oxide, silicon oxide, germanium oxide, silicon nitride and germanium nitride.
Claim 13
Dependent Claim
65 words
A superconducting device comprising a pair of superconducting films made of an oxide superconducting material and a blocking film interposed between said pair, said blocking film capable of passing a tunneling current therethrough, wherein said blocking film comprises a material selected from the group consisting of aluminum oxide, titanium oxide, copper oxide, barium oxide, yttrium oxide, silicon oxide, germanium oxide, silicon nitride and germanium nitride.
Claim 14
Dependent Claim
13 words
The device of claim 8 wherein said blocking layer is 10-50 Å thick.
References Cited (Backward Citations)
US4470190A
Cited
US4474828A
Cited
US4960751A
Cited
US4959345A
Cited
JPS63276284A
Cited
JPS63306676A
Cited
US4942142A
Cited
JPS6439084A
Cited
US5051396A
Cited
US5015620A
Cited
US4888203A
Cited
US4965244A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-02 | 1997-02-01 | 1997-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-02 | 2001-02-01 | 2001-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-02 | 2005-02-01 | 2005-08-03 | $7700.00 | Window Closed / Lapsed |