US4467009A — Indium oxide resistor inks

Claim 1

Independent Claim 93 words

A circuit board having on a portion of the surface thereof a coating of an improved resistor ink comprising: (a) from about 25 to about 80 percent by weight of indium oxide; (b) from about 5 to about 60 percent by weight of a barium calcium borosilicate glass frit; (c) from about 10 to about 35 percent by weight of a suitable organic vehicle; and (d) from about 0.1 to about 10 percent by weight of a temperature coefficient of resistance modifier selected from the group consisting of vanadium oxide and ferric oxide.

Claim 2

Dependent Claim 93 words

A circuit board having on a portion of the surface thereof a coating of an improved resistor ink comprising: (a) from about 25 to about 80 percent by weight of indium oxide; (b) from about 5 to about 60 percent by weight of a barium calcium borosilicate glass frit; (c) from about 10 to about 35 percent by weight of a suitable organic vehicle; and (d) from about 0.1 to about 10 percent by weight of a temperature coefficient of resistance modifier selected from the group consisting of vanadium oxide and ferric oxide.

Claim 3

Dependent Claim 14 words

A circuit board in accordance with claim 1, wherein said board is porcelain-coated metal.

Claim 4

Dependent Claim 13 words

A circuit board in accordance with claim 2, wherein said metal is steel.

Claim 5

Dependent Claim 100 words

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 5 to about 60 percent by weight of a barium calcium borosilicate glass frit; (c) from about 10 to about 35 percent by weight of a suitable organic vehicle; and (d) from about 0.1 to about 10 percent by weight of a temperature coefficient of resistance modifier selected from the group consisting of vanadium oxide and ferric oxide.

Claim 6

Dependent Claim 100 words

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 5 to about 60 percent by weight of a barium calcium borosilicate glass frit; (c) from about 10 to about 35 percent by weight of a suitable organic vehicle; and (d) from about 0.1 to about 10 percent by weight of a temperature coefficient of resistance modifier selected from the group consisting of vanadium oxide and ferric oxide.

Claim 7

Dependent Claim 29 words

An electronic assembly in accordance with claim 4, wherein said modifier is present in said ink in an amount of from about 1 to about 5 percent by weight.

Claim 8

Dependent Claim 31 words

An electronic assembly in accordance with claim 4, wherein said resistor film has a resistance value between about 50,000 and 1 million ohms per square and said modifier is vanadium oxide.

Claim 9

Dependent Claim 30 words

An electronic assembly in accordance with claim 4, wherein said resistor film has a resistance value between about 500 and 5,000 ohms per square and said modifier is ferric oxide.

Claim 10

Dependent Claim 15 words

An electronic assembly in accordance with claim 4, wherein said circuit board is porcelain-coated metal.

Claim 11

Dependent Claim 13 words

An electronic assembly in accordance with claim 8, wherein said metal is steel.

Claim 12

Dependent Claim 94 words

In 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 5 to about 60 percent by weight of a barium calcium borosilicate glass frit; and (c) from about 10 to about 35 percent by weight of a suitable organic vehicle; the improvement wherein said ink contains from about 0.1 to about 10 percent by weight of a temperature coefficient of resistance modifier selected from the group consisting of vanadium oxide and ferric oxide.

Claim 13

Dependent Claim 94 words

In 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 5 to about 60 percent by weight of a barium calcium borosilicate glass frit; and (c) from about 10 to about 35 percent by weight of a suitable organic vehicle; the improvement wherein said ink contains from about 0.1 to about 10 percent by weight of a temperature coefficient of resistance modifier selected from the group consisting of vanadium oxide and ferric oxide.

Claim 14

Dependent Claim 63 words

An improved resistor ink in accordance with claim 10, wherein said ink comprises from about 30 to about 45 percent by weight of indium oxide, from about 30 to about 45 percent by weight of said glass frit, from about 20 to about 30 percent by weight of said vehicle and from about 1 to about 5 percent by weight of said modifier.

Claim 15

Dependent Claim 64 words

An improved resistor ink in accordance with claim 10, wherein said glass frit consists 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.

Claim 16

Dependent Claim 48 words

An improved resistor ink in accordance with claim 12, wherein said glass frit consists of about 52 percent by weight of barium oxide, about 12 percent by weight of calcium oxide, about 19 percent by weight of boron trioxide, and about 17 percent by weight of silicon dioxide.

Claim 17

Dependent Claim 27 words

An improved resistor ink in accordance with claim 10, wherein said modifier is added to lower the temperature coefficient of resistance and said modifier is ferric oxide.

Claim 18

Dependent Claim 27 words

An improved resistor ink in accordance with claim 14, wherein the resistance value of a film formed therefrom is between about 500 and 5,000 ohms per square.

Claim 19

Dependent Claim 27 words

An improved resistor ink in accordance with claim 10, wherein said modifier is added to raise the temperature coefficient of resistance, and said modifier is vanadium oxide.

Claim 20

Dependent Claim 28 words

An improved resistor ink in accordance with claim 16, wherein the resistance value of a film formed therefrom is between about 50,000 and 1 million ohms per square.

Claim 21

Dependent Claim 16 words

An improved resistor ink in accordance with claim 16, wherein said vanadium oxide is vanadium trioxide.

Claim 22

Dependent Claim 16 words

An improved resistor ink in accordance with claim 16, wherein said vanadium oxide is vanadium pentoxide.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1987-08-21	1988-02-20	1988-08-21	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1991-08-21	1992-02-20	1992-08-21	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1995-08-21	1996-02-20	1996-08-21	$7700.00	Window Closed / Lapsed

Indium oxide resistor inks

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