US Patent 6855071 Multi-piece golf ball and method for manufacturing the same

A multi-piece golf ball with improved carry without sacrificing properties like spin performance, durability, coefficient of restitution, and the feel when the ball is hit, the golf ball including a core, an intermediate layer surrounding the core, and the cover surrounding the intermediate layer, where a plurality of voids are distributed in at least one of the core, the intermediate layer or the cover along the spherical surface of the core or intermediate layer, or the cover. 20-600 voids are formed on at least one of the interfaces between the core and the intermediate layer, between a plurality of intermediate layers, or between the intermediate layer and the cover.