Golf ball and mold therefor

In a golf ball of the icosahedral dimple arrangement pattern having twenty identical phantom regular triangles projected on its spherical surface, the improvement wherein some dimples are arranged at the apexes of each said triangle and the remaining dimples are arranged within the triangles such that none of said remaining dimples may intersect the sides of each said triangle and a great circle which does not intersect the dimples at all may not be depicted.

In a mold for molding a golf ball comprising two mold cups which are mated in a separable manner to define a spherical cavity therebetween, the improvement wherein

• the mold having twenty identical phantom regular triangles projected on the spherical cavity surface in the icosahedral dimple arrangement pattern is substantially equally divided into two mold cups along the sides of the triangles, and
• the cavity surface of each mold cup is provided with dimple-forming protrusions within each said triangle such that no protrusions may intersect the sides of each said triangle and a great circle which does not intersect the protrusions at all may not be depicted when the mold cups are mated.