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US 7,002,447 B2Granted
Fuel tank resistor card having improved corrosion resistance
AssigneeCTS Corporation
InventorsRonald Dedert, Robert Heimann, Craig Hoffman, Kevin Kurtz
Life of this patent
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Abstract
A resistor card for a fuel level sensor has improved resistance to corrosion and wear. The resistor card has a substrate with a resistive layer and a conductive layer. A nickel layer covers the conductive layer. A nickel-gold alloy layer covers the nickel layer. The nickel-gold alloy layer protects the conductive layer from sulfur corrosion and improves wear resistance.
Claims7
A resistor card for a fuel level indicator system, comprising:
- a planar ceramic substrate having a first and second surface;
- an arc-shaped set of spaced apart conductor lines mounted on the first surface, the conductor lines each having a first end, a second end and a central portion;
- an arc-shaped resistive area overlying the central portion, the resistive area in electrical contact with the electrical lines;
- an encapsulant covering the arc-shaped resistive area;
- an arc-shaped solid conductor—continuous—base mounted on the first surface and spaced from the conductor lines;
- wherein a first nickel layer covers the conductor lines and the conductor base, wherein a second nickel layer covers the first nickel layer, and wherein an electroplated nickel and palladium alloy layer covers the second nickel layer, the nickel and palladium alloy layer having a composition based on a total composition comprising 15.0 to 25.0 weight percent nickel and 75.0 to 85.0 weight percent palladium.
3 more elements
Dependencies are inferred from the claim text.