US4826808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of superconducting oxides and oxide-metal composites
Assignee: Massachusetts Institute of Technology
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Filing: 1987-03-27
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Granted: 1989-05-02
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Expires: 2007-03-27
Abstract
Abstract A method of preparing a superconducting oxide by combining the metallic elements of the oxide to form an alloy, followed by oxidation of the alloy to form the oxide. Superconducting oxide-metal composites are prepared in which a noble metal phase intimately mixed with the oxide phase results in improved mechanical properties. The superconducting oxides and oxide-metal composites are provided in a variety of useful forms.
Inventors
- 👤 Gregory J. Yurek
- 👤 John B. VanderSande
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:15
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0296; C; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/4504; C04B35/622; C04B35/64; C04B35/65; C04B35/653; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/93; Y10T; Y10T428/00; Y10T428/12; Y10T428/12007; Y10T428/12486
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
93 words
A method of preparing a superconducting composite comprising a copper containing superconducting oxide phase and a noble metal phase wherein said noble metal is selected from the group consisting of silver, platinum, palladium, and gold, said method comprising the steps of combining the metallic elements of said superconducting oxide in substantially the stoichiometric proportions needed to form said superconducting oxide with said noble metal to form an alloy; and oxidizing said alloy under conditions sufficient to oxidize said metallic elements to said superconducting oxide without oxidizing said noble metal to form said composite.
Claim 2
Independent Claim
93 words
A method of preparing a superconducting composite comprising a copper containing superconducting oxide phase and a noble metal phase wherein said noble metal is selected from the group consisting of silver, platinum, palladium, and gold, said method comprising the steps of combining the metallic elements of said superconducting oxide in substantially the stoichiometric proportions needed to form said superconducting oxide with said noble metal to form an alloy; and oxidizing said alloy under conditions sufficient to oxidize said metallic elements to said superconducting oxide without oxidizing said noble metal to form said composite.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein said alloy is formed into a shape prior to said oxidation step.
Claim 4
Dependent Claim
16 words
The method of claim 2 wherein said shape comprises a wire, ribbon, sheet, rod, or ring.
Claim 5
Dependent Claim
21 words
The method of claim 3 wherein said wire is wrapped around a metallic core in the preparation of a superconducting magnet.
Claim 6
Dependent Claim
23 words
The method of claim 2 wherein said alloy is formed into said shape by wire drawing, extrusion, coextrusion, hot isostatic pressing, or rolling.
Claim 7
Dependent Claim
21 words
The method of claim 1 wherein said alloy is provided in the form of a coating prior to said oxidation step.
Claim 8
Dependent Claim
20 words
The method of claim 6 wherein said coating is prepared by coextrusion, hot dipping, spray deposition, sputtering, or plasma spraying.
Claim 9
Dependent Claim
22 words
The method of claim 1 wherein said alloy is provided in the form of a thin film prior to said oxidation step.
Claim 10
Dependent Claim
26 words
The method of claim 8 wherein said thin film is prepared by chemical vapor deposition vacuum evaporation, sputtering, molecular beam epitaxy, ion-beam mixing, or ion implantation.
Claim 11
Dependent Claim
25 words
The method of claim 1 wherein said alloy is formed by melting said metallic elements and said noble metal together, followed by rapid solidification processing.
Claim 12
Dependent Claim
17 words
The method of claim 10 wherein said rapid solidification processing comprises melt spinning or inert gas atomization.
Claim 13
Dependent Claim
23 words
The method of claim 1 wherein said alloy is formed by melting said metallic elements and said noble metal together, followed by casting.
Claim 14
Dependent Claim
22 words
The method of claim 1 wherein said metallic elements are chosen from the group consisting of La, Ba, Cu, Y and Sr.
Claim 15
Dependent Claim
14 words
The method of claim 1 wherein said metallic elements comprise La, Ba, and Cu.
Claim 16
Dependent Claim
14 words
The method of claim 1 wherein said metallic elements comprise La, Sr and Cu.
Claim 17
Dependent Claim
14 words
The method of claim 1 wherein said metallic elements comprise Y, Ba, and Cu.
Claim 18
Dependent Claim
14 words
The method of claim 1 wherein said metallic elements comprise Lu, Ba, and Cu.
Claim 19
Dependent Claim
14 words
The method of claim 1 wherein said metallic elements comprise Lu, Sr, and Cu.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |