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US 4,376,725 AGranted
Conductor inks
AssigneeRCA Corporation
InventorsAshok N. Prabhu, Kenneth W. Hang
Life of this patent
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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.
Claims9
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.
2 more elements
Dependencies are inferred from the claim text.