Patent ID: 6849004
Filing Date: 2005-02-01
Classification: A63B

Abstract:
1. A golf-putter head having an impact face for striking a dimpled surface of a golf ball, the impact face being defined by a multiplicity of substantially parallel ridges which extend substantially lengthwise along a head with a pitch p, and which each has a hardness h and a width value w, the width value w being one of a first value w1 and a second value w2, the first value w1 being equal to the width of each ridge measured at 67% of ridge-depth from en apex, and the second value w2 being equal to the width of each ridge measured at a depth of 0.2 millimeters from the apex, the width value w being equal to w1 when the ridge-depth is not more than 0.3 millimeter and being equal to w2 when the ridge-depth is more than 0.3 millimeter, the ridges each having a profile represented by a parameter TSF that is related to p, h, and w as follows: for p not exceeding 3.5, w not exceeding (p−0.4) and TSF not exceeding 0.72, where h is measured in durometer Shore D scale, w and p in millimeters and TSF is a ratio of a cross-sectional area of a ridge-profile measured to a depth of 0.1 millimeters from the apex to a cross-sectional area measured to a depth of 0.15 millimeters from the apex.