Patent ID: 9468811
Filing Date: 2016-10-18
CPC Classification: A63B

Claim Text:
1. A golf ball comprising: a core comprising an inner core layer and an outer core layer, the inner core layer having a first outer surface and a geometric center, and the outer core layer having an inner surface, a second outer surface, and a soft transition region adjacent to the second outer surface; and a cover layer; wherein the soft transition region has a thickness of about 0.001 to 0.1 inches, comprises about 8 to 20 percent trans-polybutadiene isomer, and has a negative hardness gradient of up to 15 Shore C, and wherein the second outer surface has a hardness less than a geometric center hardness to define a negative hardness gradient across the core of up to 20 Shore C; and wherein the core has a gradient quotient, GQ, defined by the equation:  where G is the overall negative hardness gradient, T is the percent of trans-polybutadiene isomer at the second outer surface, and COR is the coefficient of restitution measured at an incoming velocity of 125 ft/s.