Patent 8622850 was granted and assigned to Bridgestone on January, 2014 by the United States Patent and Trademark Office.
This invention provides a putter head comprising a head body and a face insert mounted on a face surface of the head body. Slits are vertically aligned in multiple stages so as to extend in the face insert in a toe-to-heel direction. A depending portion is provided in the slit on a side of the face surface so as to reduce a vertical dimension of the slit. The slit is filled with a viscoelastic material.