Patent ID: 8100165

Claim:
An investment casting core combination comprising: a metallic casting core having opposite first and second faces; and a ceramic feedcore in which a first region of the metallic casting core is embedded, wherein: the metallic casting core comprises a mating edge having: a plurality of projections, the first region being along at least some of the projections; and a plurality of recesses, spanning gaps between adjacent said projections; and the ceramic feedcore comprises: a compartment subdivided into a plurality of subcompartments having a height between compartment faces on respective sides of the compartment respectively receiving the metallic casting core projections along said first and second faces; and a plurality of subdividing portions between the subcompartments, wherein the subdividing portions have a depth being less than the compartment depth so that the subcompartments merge along an initial portion of the compartment depth and respectively received in the metallic casting core recesses.