Patent ID: 6267695
Filing Date: 2001-07-31
Classification: A63B,B29C

Abstract:
A golf ball comprising; a core and a cover enclosing the core, wherein said cover consists essentially of an outer layer and an inner layer having a lower hardness than the outer layer, the cover inner layer made of a resinous material and is formed with a plurality of recesses in its outer surface and the cover outer layer is formed over the cover inner layer in such a manner that the cover outer layer penetrates into the recesses in the cover inner layer to form protrusions, the sum of the cross-sectional areas of the protrusions at their base accounts for 2 to 45% of the surface area of the cover inner layer where the cover inner layer is spherical and not formed with the recesses, and the protrusions have a height in a normal direction of at least 30% of the thickness of the cover inner layer where no recesses are formed.