Patent ID: 8109841
Filing Date: 2012-02-07
Classification: A63B

Abstract:
1. A putter face for use in a golf putter, comprising: a plurality of microscopic protrusions which have stiffness higher than that of a golf ball and which are smaller than intervals between dimples of the golf ball, each of the plurality of microscopic protrusions having an end having a protrusion front edge surface formed in a planar shape, a periphery of the protrusion front edge surface including a plurality of linear portions facing each other and a plurality of curve portions facing each other, the plurality of linear portions extending in a horizontal direction of a face plane of the putter face which horizontal direction the face plane is supposed to have at a time of striking the golf ball, the periphery of the protrusion front edge surface forming a racetrack shape (i) which is defined by a pair of the linear portions facing each other and a pair of the curve portions facing each other and (ii) which has a longer diameter of not less than 0.3 mm but not more than 0.5 mm and a shorter diameter of not less than 0.1 mm but not more than 0.2 mm.