Patent US4400214A successfully refreshed from Google Patents.
US4400214A
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US
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Conductive paste
Assignee: Panasonic Holdings Corp
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Filing: 1982-05-07
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Granted: 1983-08-23
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Expires: 2002-05-07
Abstract
Abstract Disclosed herein is a conductive paste useful for making conductors, including microcircuit conductors, and terminations for capacitors, resistors and piezo-electric transducer elements. The paste comprises an inert liquid vehicle having a metal powder and a glass powder both dispersed therein and is printed and fired in the conventional manner on dielectric substrates. The metal powder comprises an alloy powder, each particle comprising Cu, Al, and at least one of Zn and Ag. The first film of the paste is practically resistant to corrosion and practically conductive and the paste can be produced economically.
Inventors
- 👤 Yasuhiro Ogawa
- 👤 Sankichi Shida
- 👤 Katsuhiko Honjo
- 👤 Tsunehiko Todoroki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:44
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/025
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
40 words
A conductive paste comprising a liquid vehicle having a metal powder and a glass powder both dispersed therein, wherein said metal powder comprises an alloy powder, each particle thereof comprising copper, aluminum, and at least one of zinc and silver.
Claim 2
Dependent Claim
40 words
A conductive paste comprising a liquid vehicle having a metal powder and a glass powder both dispersed therein, wherein said metal powder comprises an alloy powder, each particle thereof comprising copper, aluminum, and at least one of zinc and silver.
Claim 3
Dependent Claim
20 words
A conductive paste according to claim 1, wherein said each particle of said alloy powder has a silver outer layer.
Claim 4
Dependent Claim
18 words
A conductive paste according to claim 2, wherein said silver outer layer is more than 0.05 micron thick.
Claim 5
Dependent Claim
16 words
A conductive paste according to claim 1, wherein said metal powder further comprises a silver powder.
Claim 6
Dependent Claim
27 words
A conductive paste according to claim 4, wherein the amount of said silver powder is 20 to 80 volume percent on the basis of said metal powder.
Claim 7
Dependent Claim
39 words
A conductive paste according to claim 1, 2, 3, 4 or 5, wherein said alloy powder comprises 1-15 weight percent of aluminum, 10-40 weight percent of zinc and the balance essentially copper on the basis of said alloy powder.
Claim 8
Dependent Claim
44 words
A conductive paste according to claim 1, 2, 3, 4 or 5, wherein said alloy powder comprises 2-8 weight percent of aluminum, 10-40 weight percent of zinc, 0.5-5 weight percent of tin and the balance essentially copper on the basis of said alloy powder.
Claim 9
Dependent Claim
44 words
A conductive paste according to claim 1, 2, 3, 4 or 5 wherein said alloy powder comprises 2-8 weight percent of aluminum, 10-40 weight percent of zinc, 1-30 weight percent of silver and the balance essentially copper on the basis of said alloy powder.
Claim 10
Dependent Claim
46 words
A conductive paste according to claim 1, 2, 3, 4 or 5, wherein said alloy powder comprises 2-8 weight percent of aluminum, 10-40 weight percent of zinc, 0.01 to 0.5 weight percent of boron and the balance essentially copper on the basis of said alloy powder.
Claim 11
Dependent Claim
43 words
A conductive paste according to claim 1, 2, 3, 4 or 5, wherein said alloy powder comprises 2 to 8 weight percent of aluminum, 3 to 60 weight percent of silver and the balance essentially copper on the basis of said alloy powder.
Claim 12
Dependent Claim
38 words
A conductive paste according to claim 1, 2, 3, 4 or 5, wherein said glass powder comprises B 2 O, SiO 2 , and one or more of Na 2 O, K 2 O, and Li 2 O.
Claim 13
Dependent Claim
57 words
A conductive paste according to claim 1, 2, 3, 4 or 5, wherein said glass powder has the following composition: ______________________________________
molecular
ingredients: percent
______________________________________
B.sub.2 O.sub.3 10-70
SiO.sub.2 15-60
Al.sub.2 O.sub.3 0-15
one or more of Na.sub.2 O, K.sub.2 O and Li.sub.2 O
5-60
one or more of CaO, MgO, BaO, SrO, and BeO
0-30.
______________________________________
References Cited (Backward Citations)
US4255291A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |