Indium oxide resistor inks
AssigneeRCA Corporation
InventorsAshok N. Prabhu, Kenneth W. Hang
Life of this patent
Estimating the term…
Abstract
Improved indium oxide resistor inks useful in constructing multilayer integrated circuits, particularly on porcelain-coated metal substrates, are provided. The subject inks, which are characterized by an improved temperature coefficient of resistance (TCR), comprise: indium oxide, magnesium oxide as a TCR controlling agent, a barium calcium borosilicate glass frit and a suitable organic vehicle.
Claims10
A resistor ink suitable for forming a resistor film on a circuit board comprising:
- (a) from about 25 to about 80 percent by weight of indium oxide;
- (b) from about 1 to about 20 percent by weight of magnesium oxide;
- (c) from about 5 to about 60 percent by weight of a barium calcium borosilicate glass frit;
- and
- (d) from about 10 to about 35 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 25 to about 80 percent by weight of indium oxide;
- (b) from about 1 to about 20 percent by weight of magnesium oxide;
- (c) from about 5 to about 60 percent by weight of a barium calcium borosilicate glass frit;
- and
- (d) from about 10 to about 35 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 25 to about 80 percent by weight of indium oxide;
- (b) from about 1 to about 20 percent by weight of magnesium oxide;
- (c) from about 5 to about 60 percent by weight of a barium calcium borosilicate glass frit;
- and
- (d) from about 10 to about 35 percent by weight of a suitable organic vehicle.
Dependencies are inferred from the claim text.