US4452844A — Low value resistor inks

Claim 1

Independent Claim 124 words

In 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 barium aluminum borate glass and barium calcium borosilicate glass; and (c) from about 5 to about 40 percent by weight of a suitable organic vehicle; the improvement comprising adding to said ink from about 0.5 to about 10 percent by weight of a temperature coefficient of resistance modifier comprising: (i) cadmium oxide; or (ii) ferric oxide, vanadium oxide or mixtures thereof.

Claim 2

Dependent Claim 124 words

In 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 barium aluminum borate glass and barium calcium borosilicate glass; and (c) from about 5 to about 40 percent by weight of a suitable organic vehicle; the improvement comprising adding to said ink from about 0.5 to about 10 percent by weight of a temperature coefficient of resistance modifier comprising: (i) cadmium oxide; or (ii) ferric oxide, vanadium oxide or mixtures thereof.

Claim 3

Dependent Claim 51 words

An improved resistor ink in accordance with claim 1, wherein said ink comprises from about 45 to about 65 percent by weight of said conductive ingredient, from about 15 to about 30 percent by weight of said glass and from about 20 to about 30 percent by weight of said vehicle.

Claim 4

Dependent Claim 32 words

An improved resistor ink in accordance with claim 1, wherein said modifier is added to lower the temperature coefficient of resistance and said modifier is ferric oxide, vanadium oxide or mixtures thereof.

Claim 5

Dependent Claim 27 words

An improved resistor ink in accordance with claim 3 wherein the resistance value of a film formed therefrom is between about 5 and 50 ohms per square.

Claim 6

Dependent Claim 27 words

An improved resistor ink in accordance with claim 1, wherein said modifier is added to raise the temperature coefficient of resistance, and said modifier is cadmium oxide.

Claim 7

Dependent Claim 27 words

An improved resistor ink in accordance with claim 5, wherein the resistance value of a film formed therefrom is between about 500 and 1000 ohms per square.

Claim 8

Dependent Claim 122 words

A circuit board having on a portion of the surface thereof a coating of an improved 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 barium aluminum borate glass and barium calcium borosilicate glass; (c) from about 5 to about 40 percent by weight of a suitable organic vehicle; and (d) from about 0.5 to about 10 percent by weight of a temperature coefficient of resistance modifier comprising: (i) cadmium oxide; or (ii) ferric oxide, vanadium oxide or mixtures thereof.

Claim 9

Dependent Claim 122 words

A circuit board having on a portion of the surface thereof a coating of an improved 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 barium aluminum borate glass and barium calcium borosilicate glass; (c) from about 5 to about 40 percent by weight of a suitable organic vehicle; and (d) from about 0.5 to about 10 percent by weight of a temperature coefficient of resistance modifier comprising: (i) cadmium oxide; or (ii) ferric oxide, vanadium oxide or mixtures thereof.

Claim 10

Dependent Claim 14 words

A circuit board in accordance with claim 7, wherein said board is porcelain-coated metal.

Claim 11

Dependent Claim 13 words

A circuit board in accordance with claim 8, wherein said metal is steel.

Claim 12

Dependent Claim 128 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 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 glass selected from the group consisting of barium aluminum borate glass and barium calcium borosilicate glass; (c) from about 5 to about 40 percent by weight of a suitable organic vehicle; and (d) from about 0.5 to about 10 percent by weight of a temperature coefficient of resistance modifier comprising: (i) cadmium oxide; or (ii) ferric oxide, vanadium oxide or mixtures thereof.

Claim 13

Dependent Claim 128 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 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 glass selected from the group consisting of barium aluminum borate glass and barium calcium borosilicate glass; (c) from about 5 to about 40 percent by weight of a suitable organic vehicle; and (d) from about 0.5 to about 10 percent by weight of a temperature coefficient of resistance modifier comprising: (i) cadmium oxide; or (ii) ferric oxide, vanadium oxide or mixtures thereof.

Claim 14

Dependent Claim 22 words

An electronic assembly in accordance with claim 10, wherein said modifier is present in said ink in about 5 percent by weight.

Claim 15

Dependent Claim 35 words

An electronic assembly in accordance with claim 10, wherein said resistor film has a resistance value between about 5 and 50 ohms per square and said modifier is ferric oxide, vanadium oxide or mixtures thereof.

Claim 16

Dependent Claim 30 words

An electronic assembly in accordance with claim 10, wherein said resistor film has a resistance value between about 500 and 1000 ohms per square and said modifier is cadmium oxide.

Claim 17

Dependent Claim 15 words

An electronic assembly in accordance with claim 10 wherein said circuit board is porcelain-coated metal.

Claim 18

Dependent Claim 13 words

An electronic assembly in accordance with claim 14, wherein said metal is steel.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1987-06-05	1987-12-05	1988-06-05	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1991-06-05	1991-12-05	1992-06-05	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1995-06-05	1995-12-05	1996-06-05	$7700.00	Window Closed / Lapsed

Low value resistor inks

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