Patent ID: 8617428

Claim:
A thick film resistor paste composition comprising a resistor composition dispersed in an organic vehicle, said resistor composition comprising: (a) 3 to 60% by weight RuO 2 conductive material, (b) 5 to 75% by weight Ag conductive material, (c) 15 to 60% by weight glass frit wherein the glass comprises by weight 25-45% SiO 2 , 2-15% Al 2 O 3 , O-3% ZrO 2 , O-8% B 2 O 3 , 5-15% CuO, 0-8% BaO, 0-3% P 2 O 5 , and 20-50% Bi 2 O 3 , and optionally (d) 0 to 10% by weight copper oxide or precursor thereof, and (e) 0 to 20% by weight bismuth oxide or precursor thereof wherein said resistor composition when printed to a dry thickness and fired at a temperature between 750Â° C. and 950Â° C. achieves a sheet resistivity between 10 and 10,000 milliohms/square and a hot temperature coefficient of resistivity of 1000 ppm/C or higher.