US4376725A
Expired / Lapsed
US
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Conductor inks
Assignee: Intersil Corp
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Filing: 1981-07-06
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Granted: 1983-03-15
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Expires: 2001-07-06
Abstract
Abstract Improved conductor inks useful in constructing multilayer circuits, particularly on porcelain-coated metal substrates, are provided. The subject inks comprise: copper powder, a barium calcium borosilicate glass frit, a suitable organic vehicle and bismuth oxide, which is present either in admixture with the copper powder or as a component of the glass frit.
Inventors
- 👤 Ashok N. Prabhu
- 👤 Kenneth W. Hang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:51
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; C; C03; C03C; C03C8/00; C03C8/02; C03C8/14; C03C8/18; H01; H01B; H01B1/00; H01B1/14; H01B1/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
94 words
A copper conductor ink suitable for forming a conductor film on a circuit board consisting of: (a) from about 70 to about 90 percent by weight of copper powder; (b) from about 1 to about 15 percent by weight of a barium calcium borosilicate glass frit; (c) from about 0.5 to about 3 percent by weight of bismuth oxide, wherein bismuth oxide is present in admixture with the copper powder or as a component of the glass frit; and (d) from about 6 to about 25 percent by weight of a suitable organic vehicle.
Claim 2
Dependent Claim
94 words
A copper conductor ink suitable for forming a conductor film on a circuit board consisting of: (a) from about 70 to about 90 percent by weight of copper powder; (b) from about 1 to about 15 percent by weight of a barium calcium borosilicate glass frit; (c) from about 0.5 to about 3 percent by weight of bismuth oxide, wherein bismuth oxide is present in admixture with the copper powder or as a component of the glass frit; and (d) from about 6 to about 25 percent by weight of a suitable organic vehicle.
Claim 3
Dependent Claim
62 words
A conductor ink in accordance with claim 1, wherein said ink comprises: from about 78 to about 82 percent by weight of copper powder; from about 2 to about 6 percent by weight of said glass frit; from about 1 to about 2 percent by of weight bismuth oxide; and from about 12 to about 15 percent by weight of said vehicle.
Claim 4
Dependent Claim
68 words
A conductor ink in accordance with claim 1, wherein said glass frit has the composition: (a) from about 40 to about 55 percent by weight of barium oxide; (b) from about 10 to about 15 percent by weight of calcium oxide; (c) from about 14 to about 25 percent by weight of boron trioxide; and (d) from about 13 to about 23 percent by weight of silicon dioxide.
Claim 5
Dependent Claim
48 words
A conductor ink in accordance with claim 3, wherein said glass frit has the composition: about 52 percent by weight of barium oxide; about 12 percent by weight of calcium oxide; about 16 percent by weight of boron trioxide; and about 20 percent by weight of silicon dioxide.
Claim 6
Dependent Claim
29 words
A conductor ink in accordance with claim 1, wherein said organic vehicle contains up to about 25 percent by weight, based on the vehicle, of a suitable wetting agent.
Claim 7
Dependent Claim
25 words
A conductor ink in accordance with claim 5, wherein said wetting agent comprises from about 10 to about 20 percent by weight of said vehicle.
Claim 8
Dependent Claim
19 words
A conductor ink in accordance with claim 1, wherein bismuth oxide is present in admixture with the copper powder.
Claim 9
Dependent Claim
20 words
A conductor ink in accordance with claim 1, wherein bismuth oxide is present as a component of the glass frit.
Claim 10
Dependent Claim
26 words
A conductor ink in accordance with claim 1, wherein the weight ratio of bismuth oxide to said glass frit is from about 1:1 to about 1:3.
References Cited (Backward Citations)
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US3484284A
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US4039721A
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Cited
US4316942A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |