Patent ID: 6840062

Claim:
An improved metal bottle mold which is principally formed of cast iron and is cast in a composite mold, the bottle mold having a glass contact surface, the bottle mold having at least one region subject to rapid degradation by molten glass, the improvement comprising: a dissimilar metal insert fabricated from a metal distinct from the cast-iron and embedded in the cast-iron during casting of the bottle mold in the composite mold by placing therein a dissimilar metal insert blank in each of the at least one regions in the bottle mold subject to rapid degradation; and further wherein the cast iron forms a cast iron portion of the glass contact surface and the cast iron in a region of the bottle mold at and adjacent to said cast iron portion of the glass contact surface has a refined grain structure and the cast iron in regions remote from said cast iron portion of the glass contact surface has an unrefined grain structure.