A surface is comparted into eight spherical regular triangles (T1 to T8) through twelve comparting lines formed by projecting twelve sides of a regular octahedron inscribed on the surface onto the surface. A dimple is arranged for each spherical regular triangle. In each of six apexes (P1 to P6), dimple...http://www.google.de/patents/US6540625?utm_source=gb-gplus-sharePatent US6540625 - Golf ball
