US3876433A
Expired / Lapsed
US
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Bismuth-containing silver conductor compositions
Assignee: EIDP Inc
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Filing: 1973-12-28
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Granted: 1975-04-08
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Expires: 1993-12-28
Abstract
Abstract Improved silver conductor compositions comprising, in addition to silver and inorganic binder (such as glass and Bi.sub.2 O.sub.3), bismuth, whereby the solder leach resistance of resultant conductors is enhanced. The bismuth may be present as finely divided metallic bismuth, or as a finely divided Ag/Bi coprecipitated powder. Also, dispersions thereof in inert vehicle and ceramic substrates having the conductor composition in adherent relationship therewith.
Inventors
- 👤 Oliver Alton Short
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:11
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/14; H01B1/16; H10; H10N; H10N97/00; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
53 words
IN COMPOSITIONS COMPRISING FINELY DIVIDED SILVER AND INORGANIC BINDER, USEFUL FOR PRODUCING CONDUCTIVE PATTERNS ON A DIELECTRIC SUBSTRATE, IMPROVED COMPOSITIONS ADDITIONALLY COMPRISING BISMUTH AS FINELY DIVIDED ELEMENTAL BISMUTH POWDER OR AS FINELY DIVIDED SILVER/BISMUTH COPRECIPITATE POWDER, THE AMOUNT OF BISMUTH BEING AN AMOUNT EFFECTIVE TO INCREASE THE SOLDER LEACH RESISTANCE OF CONDUCTORS THEREOF.
Claim 2
Dependent Claim
53 words
IN COMPOSITIONS COMPRISING FINELY DIVIDED SILVER AND INORGANIC BINDER, USEFUL FOR PRODUCING CONDUCTIVE PATTERNS ON A DIELECTRIC SUBSTRATE, IMPROVED COMPOSITIONS ADDITIONALLY COMPRISING BISMUTH AS FINELY DIVIDED ELEMENTAL BISMUTH POWDER OR AS FINELY DIVIDED SILVER/BISMUTH COPRECIPITATE POWDER, THE AMOUNT OF BISMUTH BEING AN AMOUNT EFFECTIVE TO INCREASE THE SOLDER LEACH RESISTANCE OF CONDUCTORS THEREOF.
Claim 3
Dependent Claim
17 words
Conductor compositions wherein the amount of bismuth is 2-20% by weight, based on the weight of silver.
Claim 4
Dependent Claim
17 words
Conductor compositions wherein the amount of bismuth is 2-20% by weight, based on the weight of silver.
Claim 5
Dependent Claim
14 words
Conductor compositions according to claim 1 wherein bismuth is finely divided elemental bismuth powder.
Claim 6
Dependent Claim
14 words
Conductor compositions according to claim 1 wherein bismuth is finely divided Ag/Bi coprecipitate powder.
Claim 7
Dependent Claim
11 words
Conductor compositions according to claim 1 dispersed in an inert vehicle.
Claim 8
Dependent Claim
11 words
Conductor compositions according to claim 2 dispersed in an inert vehicle.
Claim 9
Dependent Claim
11 words
Conductor compositions according to claim 3 dispersed in an inert vehicle.
Claim 10
Dependent Claim
11 words
Conductor compositions according to claim 4 dispersed in an inert vehicle.
References Cited (Backward Citations)
US3401126A
Cited
US3545986A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |