Patent ID: 6659889
Filing Date: 2003-12-09
Classification: A63B

Abstract:
A golf ball comprising an elastic solid core, an intermediate layer around the core, and a resin cover around the intermediate layer, composed mainly of a urethane elastomer and having a plurality of dimples on its surface, whereinthe dimples include 330 to 400 circular dimples having a diameter of at least 3.7 mm, and are substantially uniformly distributed such that there is no or only one great circle which does not intersect with the dimples, wherein the SP value is in the range of 80 to 94, provided that a sphere consisting of the core and the intermediate layer undergoes a distortion A when the load applied thereto is increased from 98 N (10 kgf) to 1275 N (130 kgf), the intermediate layer has a Shore D hardness B, the cover has a Shore D hardness C and a gage D, and SP is defined as a function of A, B, C and D by the following equation: SP+Ã—C+0.5Bâˆ’5D+5A, and wherein the values of the parameters A, B, C and D are substantially as follows, the distortion A of the sphere consisting of the core and the intermediate layerthe distortion A of the sphere consisting of the core and the intermediate layer is from 2.59 to 3.12 mm, the Shore D hardness B of the intermediate layer is from 55 to 68, the Shore D hardness C of the cover is from 45 to 56, and the gage D of the cover is 0.7 to 1.7 mm.