Patent 7658685 was granted and assigned to Acushnet (company) on February, 2010 by the United States Patent and Trademark Office.
The present invention is directed to a golf club head with an improved striking surface. The grooves are machined into the strike surface with tight tolerances. The grooves have sharp edges, radiused ends, and a draft angle between about 2° and 12°. The striking face is machined such that it has a uniform texture with a roughness of more than 40 Ra.