Patent US5232901A successfully refreshed from Google Patents.
US5232901A
Expired / Lapsed
US
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Method of producing superconducting ceramic wire having protective metal coating thereon
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1991-03-07
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Granted: 1993-08-03
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Expires: 2011-03-07
Abstract
Abstract There is provided a method of producing a protective metal coated or covered superconducting ceramic wire by applying a finely pulverized protective metal-dispersed polymeric resin onto the surface of a glass wire in amorphous state of metal oxides capable of being converted into superconductive ceramic, heating the wire to remove the polymeric resin therefrom to obtain the wire having a metal powder coating thereon, and heat-treating the wire to become superconductive. The coating is easily conducted without damaging the excellent productivity of the so-called melt-quenching and preform wire-drawing process for producing a superconducting ceramic wire.
Inventors
- 👤 Masashi Onishi
- 👤 Takashi Kohgo
- 👤 Yoshiki Chigusa
- 👤 Minoru Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:44
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C03; C03C; C03C10/00; C03C10/009; C04B41/45; C04B41/50; C04B41/51; C04B41/5111; C04B41/80; C04B41/81; C04B41/85; C04B41/88; 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; Y10S505/742
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
128 words
A method of producing a protective metal coated oxide superconducting wire which comprises applying a finely pulverized protective metal powder-dispersed polymeric resin onto the surface of a glass wire in amorphous state, the metal of the metal powder being selected from the group consisting of Ag, Au, Pt, Cu, Ni and alloys thereof, heating the wire to remove the polymeric resin therefrom to obtain the glass wire having a metal powder coating thereon and heating the wire to become superconductive, the glass wire being prepared by a method of melting a mixture which consists essentially of metal oxides capable of being converted into superconductive ceramic, quenching the melt to form a glass, making a preform of the glass and wire-drawing the preform while maintaining an amorphous state thereof.
Claim 2
Independent Claim
128 words
A method of producing a protective metal coated oxide superconducting wire which comprises applying a finely pulverized protective metal powder-dispersed polymeric resin onto the surface of a glass wire in amorphous state, the metal of the metal powder being selected from the group consisting of Ag, Au, Pt, Cu, Ni and alloys thereof, heating the wire to remove the polymeric resin therefrom to obtain the glass wire having a metal powder coating thereon and heating the wire to become superconductive, the glass wire being prepared by a method of melting a mixture which consists essentially of metal oxides capable of being converted into superconductive ceramic, quenching the melt to form a glass, making a preform of the glass and wire-drawing the preform while maintaining an amorphous state thereof.
Claim 3
Dependent Claim
21 words
A method of producing a protective metal coated oxide superconducting wire according to claim 1, wherein the protective metal is Ag.
Claim 4
Dependent Claim
41 words
A method of producing a protective metal coated oxide superconducting wire according to claim 1, wherein the heating of the wire to remove the polymeric resin therefrom is effected at a temperature below the glass transition temperature of the glass wire.
Claim 5
Dependent Claim
40 words
A method of producing a protective metal coated oxide superconducting wire according to claim 1, wherein the heating of the wire to remove the polymeric resin therefrom is effected at a temperature below the crystallization temperature of the glass wire.
Claim 6
Dependent Claim
35 words
A method of producing a protective metal coated oxide superconducting wire according to claim 1, wherein before the heating of the wire to remove the polymeric resin therefrom the applied resin is hardened or dried.
Claim 7
Dependent Claim
26 words
A method of producing a protective metal coated oxide superconducting wire according to claim 1, wherein the glass wire is 100 μm or less in thickness.
Claim 8
Dependent Claim
36 words
A method of producing a protective metal coated oxide superconducting wire according to claim 1, wherein the protective metal powder-dispersed resin is a thermoplastic resin in the form of a thermo or photodrying paste or varnish.
Claim 9
Dependent Claim
39 words
A method of producing a protective metal coated oxide superconducting wire according to claim 1, wherein the glass is a Bi-Ca-Sr-Cu-O system, Bi-Ca-Sr-Cu-O system doped with Pb, Ag, Ni, Sb or any mixture thereof, Tl-Ba-Ca-Cu-O system or Tl-Bi-Sr-Ca-Cu-O system.
Claim 10
Dependent Claim
32 words
A method of producing a protective metal coated oxide superconducting wire according to claim 1, wherein the glass is a Bi-Ca-Sr-Cu-O system doped with Pb, Ag, Ni, Sb or any mixture thereof.
Claim 11
Dependent Claim
29 words
A method of producing a protective metal coated oxide superconducting wire according to claim 1, wherein the polymeric resin is a polyacrylic acid, polyacrylate, polyvinyl alcohol or polyvinyl butyral.
Claim 12
Dependent Claim
24 words
A method of producing protective metal coated oxide superconducting wire according to claim 1, wherein the applying of the resin is repeated several times.
Claim 13
Dependent Claim
43 words
A method of producing a protective metal coated oxide superconducting wire according to claim 1, wherein a subsequent heat-treatment is effected before, during or after an application of pressure to the metal coated oxide superconducting wire to enhance the critical current density thereof.
Claim 14
Dependent Claim
23 words
A method of producing a protective metal coated oxide superconducting wire according to claim 1, wherein the polymeric resin is a polyacrylic acid.
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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) | 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 |