Patent 8113965 was granted and assigned to Bridgestone on February, 2012 by the United States Patent and Trademark Office.
This invention provides a golf club head comprising a plurality of scorelines formed in its face. The golf club head is configured such that an angle θ of the side wall of the scoreline with respect to the face is 70° or less, the edge of the scoreline has a ridged portion projecting from the face, and a height H of the ridged portion from the face satisfies: 5 μm≦H≦20 μm.