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US5070071A
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US
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Method of forming a ceramic superconducting composite wire using a molten pool
Assignee: Leland Stanford Junior University
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Filing: 1988-10-11
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Granted: 1991-12-03
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Expires: 2008-10-11
Abstract
Abstract A method is provided for making a flexible superconductive composite wire by drawing a wire of noble metal through a melt formed from solid superconducting material. The preferred superconducting material comprises the Bi-Sr-Ca-Cu-O class of materials.
Inventors
- 👤 Theodore H. Geballe
- 👤 Robert S. Feigelson
- 👤 Dan Gazit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:37
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/4521; C04B35/622; C04B35/653; C23; C23C; C23C2/00; C23C2/04; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0801; Y; Y10; Y10S; Y10S505/00; Y10S505/70; Y10S505/704; Y10S505/725; Y10S505/733; Y10S505/739; Y10S505/74
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
105 words
A method for making a flexible superconductive composite wire comprising the steps of: (a) drawing a wire of noble metal through a molten material, formed by melting a solid formed by pressing powdered Bi 2 O 3 , CaCO 3 , SrCO 3 and CuO in a ratio of components necessary for forming a Bi-Sr-Ca-Cu-O superconductor, into said solid and sintering at a temperature in the range of 750°-800° C. for 10-20 hours, whereby said wire is coated by said molten material; and (b) cooling said coated wire to solidify said molten material to form said superconductive flexible composite wire without need of further annealing.
Claim 2
Independent Claim
105 words
A method for making a flexible superconductive composite wire comprising the steps of: (a) drawing a wire of noble metal through a molten material, formed by melting a solid formed by pressing powdered Bi 2 O 3 , CaCO 3 , SrCO 3 and CuO in a ratio of components necessary for forming a Bi-Sr-Ca-Cu-O superconductor, into said solid and sintering at a temperature in the range of 750°-800° C. for 10-20 hours, whereby said wire is coated by said molten material; and (b) cooling said coated wire to solidify said molten material to form said superconductive flexible composite wire without need of further annealing.
Claim 3
Dependent Claim
24 words
A method according to claim 1 wherein said wire is drawn through said melt at the rate of less than 25 millimeters per hours.
Claim 4
Dependent Claim
22 words
A method according to claim 1 wherein said sintering is conducted at a temperature of about 780° C. for about 15 hours.
Claim 5
Dependent Claim
31 words
A method according to claim 1 wherein said molten material is formed by heating said solid by focusing radiation thereon from a lasing device while said wire is in contact therewith.
Claim 6
Dependent Claim
17 words
A method according to claim 4 wherein said wire is drawn through an orifice in said solid.
Claim 7
Dependent Claim
17 words
A method according to claim 4 wherein said wire is drawn along a surface of said solid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-02 | 1995-06-03 | 1995-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-02 | 1999-06-03 | 1999-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-02 | 2003-06-03 | 2003-12-03 | $7700.00 | Window Closed / Lapsed |