Golf ball having a non-uniform thickness layer

Abstract

A golf ball having a high rotational moment of inertial core assembly is disclosed. The core assembly may comprise a low specific gravity core and non-uniform thickness, high specific gravity intermediate layer. This sub-assembly is preferably encased within a soft cover. The low specific gravity core is preferably made from a foamed polymer or from a polymer with its specific gravity reduced, and the non-uniform thickness, high specific gravity core preferably has outer projections, inner projections or both disposed thereon. The projections increase the durability of the intermediate layer, thereby allowing polymers with high flexural modulus to be used as the intermediate layer. Alternatively, the inner and outer projections may extend circumferentially to form webs or ribs on the intermediate layer to increase its stiffness. The ball may comprise a second non-uniform thickness layer, wherein one or both of the intermediate layers comprise high specific gravity materials.

Dependencies are inferred from the claim text.