Patent ID: 6217463
Filing Date: 2001-04-17
Classification: A63B

Abstract:
A golf ball comprising at least a core, an inner layer cover and an outer layer cover, in which convex ribs are formed on the inner surface of the outer layer cover such that the convex ribs intrude into the inner layer cover; the hardness of the outer layer cover is greater than that of the inner layer cover; and the convex ribs are arranged in a network pattern such that when the apexes of each spherical triangle of a hypothetical octahedron or icosahedron assumed on the inner surface of the outer layer cover are each represented by A, the center of the triangle is represented by B, the midpoint of each side of the triangle is represented by C, and a point on a line connecting the center B and each apex A is represented by D, a convex rib is arranged along each of a line between point A and point D, a line between point B and point D, and a line between point C and point D.