Patent ID: 7722732

Claim:
A method of producing a co-fired ceramic circuit using a thick film via fill paste composition comprising the steps of: (i) providing a high dielectric sheet with via holes, (ii) filling said via holes with said thick film via fill paste composition of BaTiO 3 66 wt %, lead germanate glass 4 wt %, and an organic medium 30 wt %, based upon the weight of the total via fill paste composition, and wherein said lead germanate glass comprises, in weight percent glass, 78.5% Pb 3 O 4 and 21.5% GeO 2 , (iii) drying said via fill paste composition in said filled via holes by heating at 120° C. to 150° C., (iv) applying a layer of conductor paste to said high dielectric sheet with filled via holes to form at least two layers, and (v) sintering said at least two layers to form a multilayer low temperature cofired ceramic circuit.