Patent ID: 7942761
Filing Date: 2011-05-17
Classification: A63B

Abstract:
1. A golf ball comprising: an inner core layer consisting essentially of a thermoplastic material and having a geometric center hardness greater than a surface hardness to define a first negative hardness gradient; an outer core layer disposed about the inner core, the outer core being formed from a substantially homogenous thermoset composition and having an inner surface hardness greater than an outer surface hardness to define a second negative hardness gradient; an inner cover layer disposed outer core layer; and an outer cover layer disposed about the inner cover layer, wherein the first negative hardness gradient is from −1 to −5 Shore C, the second negative hardness gradient is at least −1 Shore C but less than −7 Shore C, and a difference between the inner core surface hardness and the outer core inner surface hardness, Δh, is at least −3 Shore C.