Patent US5338507A successfully refreshed from Google Patents.
US5338507A
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Silver additives for ceramic superconductors
Assignee: HP Inc
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Filing: 1991-08-29
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Granted: 1994-08-16
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Expires: 2011-08-29
Abstract
Abstract A method for making metal/ceramic superconductor thick film structures including the steps of preparing a silver/superconductor ink, applying the ink to a substrate, evaporating the ink's binder, decomposing a silver compound in the residue to coat the superconductor grains, sintering the coated superconductor grains, and oxygenating the superconductor grains through the silver coating. The resultant inter-granular silver increases the critical current and mechanical strength of the superconductor.
Inventors
- 👤 John T. Anderson
- 👤 V. K. Nagesh
- 👤 Richard C. Ruby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:23
CPC Classifications
C; C01; C01G; C01G3/00; C01G3/006; C04; C04B; C04B35/00; C04B35/01; C04B35/45; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0296; H10N60/0352; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/80
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
54 words
A method for making a superconductor material comprising the steps of: firstly producing a multitude of copper-oxide based superconductor grains; secondly mixing a material comprising silver with said superconductor grains; and thirdly heating said mixture of said superconductor grains and said material comprising silver to cause intergranular silver to electrically contact said superconductor grains.
Claim 2
Independent Claim
54 words
A method for making a superconductor material comprising the steps of: firstly producing a multitude of copper-oxide based superconductor grains; secondly mixing a material comprising silver with said superconductor grains; and thirdly heating said mixture of said superconductor grains and said material comprising silver to cause intergranular silver to electrically contact said superconductor grains.
Claim 3
Dependent Claim
34 words
A method as recited in claim 1 wherein said material is a compound of silver and wherein said step of heating said mixture decomposes said compound to provide elemental silver for contacting said grains.
Claim 4
Dependent Claim
13 words
A method as recited in claim 1 wherein said material comprises elemental silver.
Claim 5
Dependent Claim
18 words
A method as recited in claim 1 further comprising an additional heating step to sinter said superconductor grains.
Claim 6
Dependent Claim
30 words
A method as recited in claim 1 further comprising an additional heating step in the presence of oxygen such that oxygen may diffuse through said silver to said superconductor grains.
Claim 7
Independent Claim
56 words
A method for making a superconductor material comprising: producing a copper-oxide based superconductor; powdering said superconductor to create a plurality of particles; combining said powdered superconductor with a silver material; compacting said combination of said powdered superconductor and said silver material to form a cohesive structure; and heating said structure to sinter said particles of superconductor.
Claim 8
Independent Claim
56 words
A method for making a superconductor material comprising: producing a copper-oxide based superconductor; powdering said superconductor to create a plurality of particles; combining said powdered superconductor with a silver material; compacting said combination of said powdered superconductor and said silver material to form a cohesive structure; and heating said structure to sinter said particles of superconductor.
Claim 9
Dependent Claim
25 words
A method for making a superconductor material as recited in claim 6 further comprising the step of: heating said structure in the presence of oxygen.
Claim 10
Dependent Claim
33 words
A method as recited in claim 7 wherein said step of heating said structure in the presence of oxygen is accomplished in a one-atmosphere oxygen oven at a temperature of about 500° C.
Claim 11
Dependent Claim
21 words
A method as recited in claim 6 wherein said particles have an average size of no more than about 5 microns.
Claim 12
Dependent Claim
25 words
A method as recited in claim 9 wherein sufficient silver material is added to coat said particles with silver of about 0.05 microns in thickness.
Claim 13
Dependent Claim
29 words
A method as recited in claim 6 wherein said silver material includes a volatile liquid, and further comprising the step of heating said combination to evaporate said volatile liquid.
Claim 14
Dependent Claim
21 words
A method as recited in claim 11 wherein said combination is heated to about 100° C. to evaporate said volatile liquid.
Claim 15
Dependent Claim
21 words
A method as recited in claim 6 wherein said combination is compacted at a pressure of at least about 10,000 p.s.i.
Claim 16
Dependent Claim
24 words
A method as recited in claim 6 wherein said step of heating said structure to sinter said particles is accomplished at about 500°-600° C.
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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) | 1997-08-15 | 1998-02-14 | 1998-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-15 | 2002-02-14 | 2002-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-15 | 2006-02-14 | 2006-08-16 | $7700.00 | Window Closed / Lapsed |