Patent US5082688A successfully refreshed from Google Patents.
US5082688A
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Processes of forming Ag doped conductive crystalline bismuth mixed alkaline earth copper oxide films
Assignee: Eastman Kodak Co
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Filing: 1989-05-04
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Granted: 1992-01-21
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Expires: 2009-05-04
Abstract
Abstract A process is disclosed of promoting the growth of crystalline bismuth mixed alkaline earth copper oxide grains in forming a conductive film by incorporating silver in the bismuth mixed alkaline earth copper oxide prior to sintering.
Inventors
- 👤 John A. Agostinelli
- 👤 Liang-Sun Hung
- 👤 Jose M. Mir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:30
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/4521; C04B35/4525; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0296; H10N60/0548; H10N60/80; H10N60/85; H10N60/855; H10N60/857; Y; Y10; Y10S; Y10S505/00; Y10S505/725; Y10S505/73; Y10S505/731; Y10S505/732; Y10S505/734
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
A process of forming on a substrate a conductive film containing grains of crystalline bismuth mixed alkaline earth copper oxide comprising depositing a bismuth mixed alkaline earth copper oxide on the substrate and sintering at least a portion of the bismuth mixed alkaline earth copper oxide to form a conductive crystalline grain structure, characterized in that silver is incorporated in the bismuth mixed alkaline earth copper oxide as a grain growth promoting agent prior to sintering.
Claim 2
Dependent Claim
76 words
A process of forming on a substrate a conductive film containing grains of crystalline bismuth mixed alkaline earth copper oxide comprising depositing a bismuth mixed alkaline earth copper oxide on the substrate and sintering at least a portion of the bismuth mixed alkaline earth copper oxide to form a conductive crystalline grain structure, characterized in that silver is incorporated in the bismuth mixed alkaline earth copper oxide as a grain growth promoting agent prior to sintering.
Claim 3
Dependent Claim
28 words
A process according to claim 1 further characterized in that silver is present prior to sintering in a concentration of from 1 to 20 percent, based on copper.
Claim 4
Dependent Claim
28 words
A process according to claim 2 further characterized in that silver is present prior to sintering in a concentration of from 5 to 10 percent, based on copper.
Claim 5
Dependent Claim
40 words
A process according to claim 1 further characterized in that the mixed alkaline earth copper oxide contains a combination of calcium and strontium, with from 0 to 10 percent barium being substituted for strontium, based on barium and strontium combined.
Claim 6
Dependent Claim
20 words
A process according to claim 1 further characterized in that the alkaline earth elements consist essentially of strontium and calcium.
Claim 7
Dependent Claim
35 words
A process according to claim 1 further characterized in that from 0 to 50 percent lead, based on bismuth, in the form of lead oxide is present in the bismuth mixed alkaline earth copper oxide.
Claim 8
Dependent Claim
107 words
A process according to claim 1 further characterized in that the oxide and silver on the substrate prior to converting to the crystalline phase satisfies the metal ratio: M.sub.a IIA.sub.b (CuAg.sub.x).sub.c where M is bismuth and 0 to 50 percent lead, based on bismuth and lead combined; a is from 1.6 to 9; IIA is a combination of the alkaline earth elements A and Ca in a ratio of from 1:3 to 3:1; A is strontium and 0 to 10 percent barium, based on barium and strontium combined; b is from 2.4 to 4.8; c is from 2 to 3; and x is from 0.01 to 0.2.
Claim 9
Dependent Claim
100 words
A process according to claim 7 further characterized in that the oxide and silver on the substrate prior to converting to the crystalline phase satisfies the metal ratio: M.sub.a IIA.sub.b (CuAg.sub.x).sub.c where M is bismuth and 5 to 40 percent lead, based on bismuth and lead combined; a is from 1.6 to 6; IIA is a combination of the alkaline earth elements A and Ca in a ratio of 2.5:0.5 to 1.0:1.5; A is strontium and from 0 to 10 percent barium, based on strontium and barium; b is from 2.4 to 3.6; and x is from 0.01 to 0.2.
Claim 10
Dependent Claim
44 words
A process according to claim 7 further characterized in that M is bismuth; a is from 1.8 to 4; IIA is a combination of the alkaline earth elements Sr and Ca; b is from 2.7 to 3.3; and x is from 0.05 to 0.1.
Claim 11
Dependent Claim
34 words
A process according to claim 1 further characterized in that the oxide is converted to the conductive crystalline grain structure by sintering at a temperature in the range of from 800° to 910° C.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-01-20 | 1995-07-22 | 1996-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-20 | 1999-07-22 | 2000-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-20 | 2003-07-22 | 2004-01-21 | $7700.00 | Window Closed / Lapsed |