Patent US5075282A successfully refreshed from Google Patents.
US5075282A
Expired / Lapsed
US
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Printing method of forming oxide superconducting films on La2 Cu O.sub.
Assignee: Semiconductor Energy Laboratory Co Ltd
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Filing: 1989-10-16
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Granted: 1991-12-24
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Expires: 2009-10-16
Abstract
Abstract A method of manufacturing a conducting or superconducting film comprises the steps of providing a powdered composition of complex oxide conducting or superconducting materials represented by the general formula: (La l-x M x ) y CuO 4- δ, where M is a member selected from the group of alkali earth metals and mixtures of the alkali earth metals: x=0 to 1. y=1.5 to 2.5, adding an organic solvent to the powdered composition to form a kneaded paste, printing the paste on a substrate before drying and firing.
Inventors
- 👤 Hideomi Koinuma
- 👤 Takuya Hashimoto
- 👤 Fueki Kazuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:17
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B35/00; C04B35/01; C04B35/45; C04B35/4504; C04B41/45; C04B41/50; C04B41/5072; C04B41/5074; C04B41/80; C04B41/81; C04B41/85; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; C04B2111/00; C04B2111/00474; C04B2111/00844; Y; Y10; Y10S; Y10S505/00; Y10S505/725; Y10S505/739; Y10S505/741
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
161 words
A method of producing copper oxide superconducting films comprising the steps of: providing a powdered composition conforming to a copper oxide superconducting ceramic composition, wherein the copper oxide superconducting ceramic is represented by the general formula: (La 1-x M x ) y CuO 4- δ, where M is a member selected from the group consisting of alkali earth metals and mixtures of the alkali earth metals and where x is a value which provides said copper oxide superconducting ceramic composition, y=1.5 to 2.5 and δ=0 to 1; adding said powdered composition to a solvent in order to produce a paste, said solvent comprising at least one of octyl alcohol, propylene glycol and heptyl alcohol; printing said paste on a substrate comprising La 2 CuO 4 in order to form a precursor superconducting film; firing said printed film at 700° C.-1000° C.; and increasing at least the critical temperature of the fired film by effecting thermal annealing at approximately 500° C. thereof.
Claim 2
Independent Claim
161 words
A method of producing copper oxide superconducting films comprising the steps of: providing a powdered composition conforming to a copper oxide superconducting ceramic composition, wherein the copper oxide superconducting ceramic is represented by the general formula: (La 1-x M x ) y CuO 4- δ, where M is a member selected from the group consisting of alkali earth metals and mixtures of the alkali earth metals and where x is a value which provides said copper oxide superconducting ceramic composition, y=1.5 to 2.5 and δ=0 to 1; adding said powdered composition to a solvent in order to produce a paste, said solvent comprising at least one of octyl alcohol, propylene glycol and heptyl alcohol; printing said paste on a substrate comprising La 2 CuO 4 in order to form a precursor superconducting film; firing said printed film at 700° C.-1000° C.; and increasing at least the critical temperature of the fired film by effecting thermal annealing at approximately 500° C. thereof.
Claim 3
Dependent Claim
18 words
The method of claim 1, further comprising the step of drying said printed film before said firing step.
Claim 4
Dependent Claim
13 words
The method of claim 1, wherein the step of printing is screen printing.
Claim 5
Independent Claim
179 words
A method of producing copper oxide superconducting films comprising the steps of: providing a powdered composition conforming to a copper oxide superconducting ceramic composition, wherein the copper oxide superconducting ceramic is represented by the general formula: (N 1-x M x ) p Cu q O 7- δ, wherein N is an element selected from the group of Sc, Y and a lanthanide; M is a member selected from the group consisting of alkali earth metals and mixtures of the alkali earth metals; where x is a value which provides said copper oxide superconducting ceramic composition, p=2.5 to 3.5, q=1.5 to 3.5, and δ=0 to 1; adding said powdered composition to a solvent in order to produce a paste, said solvent comprising at least one of octyl alcohol, propylene glycol and heptyl alcohol; printing said paste on a substrate comprising La 2 CuO 4 in order to form a precursor superconducting film; firing said printed film at 700° C.-1000° C.; and increasing at least the critical temperature of the fired film by effecting thermal annealing at approximately 500° C. thereof.
Claim 6
Independent Claim
179 words
A method of producing copper oxide superconducting films comprising the steps of: providing a powdered composition conforming to a copper oxide superconducting ceramic composition, wherein the copper oxide superconducting ceramic is represented by the general formula: (N 1-x M x ) p Cu q O 7- δ, wherein N is an element selected from the group of Sc, Y and a lanthanide; M is a member selected from the group consisting of alkali earth metals and mixtures of the alkali earth metals; where x is a value which provides said copper oxide superconducting ceramic composition, p=2.5 to 3.5, q=1.5 to 3.5, and δ=0 to 1; adding said powdered composition to a solvent in order to produce a paste, said solvent comprising at least one of octyl alcohol, propylene glycol and heptyl alcohol; printing said paste on a substrate comprising La 2 CuO 4 in order to form a precursor superconducting film; firing said printed film at 700° C.-1000° C.; and increasing at least the critical temperature of the fired film by effecting thermal annealing at approximately 500° C. thereof.
Claim 7
Dependent Claim
18 words
The method of claim 4, further comprising the step of drying said printed film before said firing step.
Claim 8
Dependent Claim
13 words
The method of claim 4, wherein the step of printing is screen printing.
Claim 9
Dependent Claim
20 words
The method of claim 1 where said superconducting ceramic is (La 0 .9 Sr 0 .1) 2 CuO 4- δ.
Claim 10
Dependent Claim
23 words
The method of claim 4 where in said superconducting ceramic, N is Y, M is Ba, and the Y:Ba:Cu stoichiometric ratio is 1:2:3.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |