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Patent US4943557A successfully refreshed from Google Patents.
US4943557A
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Method of making a high density YBa Cu3 Ox superconductor material
Assignee: Nokia Bell Labs
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Filing: 1988-08-15
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Granted: 1990-07-24
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Expires: 2008-08-15
Abstract
Abstract In a process for making the superconductive composition YBa2Cu3Ox, cupric carbonate or cupric oxalate is used as the copper source and barium carbonate as the barium source to achieve higher densification.
Inventors
- 👤 Hung C. Ling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:04
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/4504; C04B35/4508; C01; C01G; C01G3/00; C01G3/006; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0772; Y; Y10; Y10S; Y10S505/00; Y10S505/725; Y10S505/742; Y10S505/775; Y10S505/776; Y10S505/779; Y10S505/78
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
135 words
A method of making a superconductor composition of YBa 2 Cu 3 O x comprising the steps of: mixing together a compound of yttrium, barium carbonate, and a compound of copper selected from the group consisting of cupric carbonate and cupric oxalate; calcining the mixture by heating it to a temperature of 850 to 950 degrees C.; milling the calcined material; pressing the milled and calcined material to a solid structure; sintering the solid structure in an oxygen-containing atmosphere at a temperature of 960 to 990 degrees C. for at least two hours; annealing the sintered structure at 400 to 600 degrees C. for a period of time from two hours to two days, thereby to obtain a structure of YBa 2 Cu 3 O x which has a density of a least 90 .
Claim 2
Independent Claim
135 words
A method of making a superconductor composition of YBa 2 Cu 3 O x comprising the steps of: mixing together a compound of yttrium, barium carbonate, and a compound of copper selected from the group consisting of cupric carbonate and cupric oxalate; calcining the mixture by heating it to a temperature of 850 to 950 degrees C.; milling the calcined material; pressing the milled and calcined material to a solid structure; sintering the solid structure in an oxygen-containing atmosphere at a temperature of 960 to 990 degrees C. for at least two hours; annealing the sintered structure at 400 to 600 degrees C. for a period of time from two hours to two days, thereby to obtain a structure of YBa 2 Cu 3 O x which has a density of a least 90 .
Claim 3
Dependent Claim
39 words
The method of claim 1 wherein: the calcining step comprises the step of heating the material to 850-950 degrees C. for approximately two hours, cooling it, granulating it, and reheating it to 850-950 degrees C. for approximately two hours.
Claim 4
Dependent Claim
30 words
The method of claim 1 wherein: the sintering step comprises the step of heating the structure at 960-990 degrees C. in an atmosphere containing free oxygen for approximately twelve hours.
Claim 5
Dependent Claim
33 words
The method of claim 1 wherein: The initial mixing comprises the steps of mixing the compounds with a liquid, milling the mixture, and removing the liquid by filtering and by drying the mixture.
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein: the compound of copper is cupric carbonate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-23 | 1994-01-22 | 1994-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-23 | 1998-01-22 | 1998-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-23 | 2002-01-22 | 2002-07-24 | $7700.00 | Window Closed / Lapsed |