Patent ID: 7635312

Claim:
A multi-layer golf ball comprising an inner core, an outer core, at least one intermediate layer and a cover layer, wherein each subassembly of the golf ball has a combined coefficient of restitution value of COR C and an initial velocity V C for the inner core, COR C1 and V C1 for a first subassembly with an inner core layer and an outer core layer adjacent to the inner core, COR C2 and V 2 for a second subassembly with an intermediate layer adjacent to the outer core layer, and COR C3 and V 3 for the ball including the cover layer, such that COR C ≧COR C1 +0.004; COR C1 ≧COR C2 +0.004; COR C2 ≧COR C3 +0.004, COR C being at least 0.815, and V C ≧V C1 ≧V C2 ≧V C3 , wherein the inner core is formed of a first material having a first Shore D hardness and a first elastic modulus, the outer core is formed of a second material having a second Shore D hardness and a second elastic modulus such that the first Shore D hardness and the second Shore D hardness differ by at least 10 points and the first elastic modulus and the second elastic modulus differ by at least 10%.