Low value resistor inks
AssigneeRCA Corporation
InventorsAshok N. Prabhu, Kenneth W. Hang
Life of this patent
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Abstract
Improved resistor inks useful in constructing multilayer integrated circuits, particularly on porcelain-coated metal substrates, are provided. The subject inks comprise: a conductive component consisting of stannous oxide and molybdenum trioxide or a mixture of molybdenum trioxide and metallic molybdenum; a glass powder selected from the group consisting of a barium aluminum borate glass and a barium calcium borosilicate glass; and a suitable organic vehicle.
Claims10
A resistor ink suitable for forming a resistor film on a circuit board comprising:
- (a) from about 30 to about 85 percent by weight of a conductive component comprising stannous oxide and molybdenum trioxide or a mixture of molybdenum trioxide and metallic molybdenum;
- (b) from about 10 to about 65 percent by weight of a glass selected from the group consisting of:
- (i) a barium aluminum borate glass consisting of from about 40 to about 55 percent by weight of barium oxide, from about 16 to about 22 percent by weight of aluminum oxide, and from about 14 to about 40 percent by weight of boron trioxide;
- and
- (ii) a barium calcium borosilicate glass consisting of from about 40 to about 55 percent by weight of barium oxide, from about 10 to about 15 percent by weight of calcium oxide, from about 14 to about 25 percent by weight of boron trioxide and from about 13 to about 23 percent by weight of silicon dioxide;
- and
- (c) from about 5 to about 40 percent by weight of a suitable organic vehicle.
A circuit board having on a portion of the surface thereof a coating of a resistor ink comprising:
- (a) from about 30 to about 85 percent by weight of a conductive component comprising stannous oxide and molybdenum trioxide or a mixture of molybdenum trioxide and metallic molybdenum;
- (b) from about 10 to about 65 percent by weight of a glass selected from the group consisting of:
- (i) a barium aluminum borate glass consisting of from about 40 to about 55 percent by weight of barium oxide, from about 16 to about 22 percent by weight of aluminum oxide, and from about 14 to about 40 percent by weight of boron trioxide;
- and
- (ii) a barium calcium borosilicate glass consisting of from about 40 to about 55 percent by weight of barium oxide, from about 10 to about 15 percent by weight of calcium oxide, from about 14 to about 25 percent by weight of boron trioxide and from about 13 to about 23 percent by weight of silicon dioxide;
- and
- (c) from about 5 to about 40 percent by weight of a suitable organic vehicle.
An electronic assembly comprising a circuit board having a circuit thereon, said circuit containing a resistor film formed by applying and firing a resistor ink comprising:
- (a) from about 30 to about 85 percent by weight of a conductive component comprising stannous oxide and molybdenum trioxide or a mixture of molybdenum trioxide and metallic molybdenum;
- (b) from about 10 to about 65 percent by weight of a glass selected from the group consisting of:
- (i) a barium aluminum borate glass consisting of from about 40 to about 55 percent by weight of barium oxide, from about 16 to about 22 percent by weight of aluminum oxide, and from about 14 to about 40 percent by weight of boron trioxide;
- and
- (ii) a barium calcium borosilicate glass consisting of from about 40 to about 55 percent by weight of barium oxide, from about 10 to about 15 percent by weight of calcium oxide, from about 14 to about 25 percent by weight of boron trioxide and from about 13 to about 23 percent by weight of silicon dioxide;
- and
- (c) from about 5 to about 40 percent by weight of a suitable organic vehicle.
Dependencies are inferred from the claim text.