Patent ID: 8257619

Claim:
A substantially lead-free thick-film resistor paste composition including a resistor composition dispersed in an organic vehicle, said resistor composition comprising: (a) RuO 2 conductive material; (b) an α-oxide comprising CuO; (c) a borosilicate glass composition comprising: (i) B 2 O 3 , (ii) SiO 2 , (iii) a δ-oxide selected from the group consisting of BaO, CaO, ZnO, SrO, MgO and combinations thereof, and optionally including any of (iv) P 2 O 5 , (v) ZrO 2 and (vi) Al 2 O 3 , and wherein said CuO α-oxide is present in the borosilicate glass composition, or both the paste composition separately and the borosilicate glass composition; and (d) a β-oxide comprising Ta 2 O 5 ; wherein said Ta 2 O 5 β-oxide is present in the borosilicate glass composition, or both the paste composition separately and the borosilicate glass composition.