Patent ID: 8075419

Claim:
An iron-type golf club head, comprising: a striking wall having a front surface and a rear surface; a heel portion and an opposing toe portion; a top portion extending from the heel portion to the toe portion; a sole portion extending from the heel portion to the toe portion, the sole portion including a forward end, a rearward end, an upper surface, and a lower surface including an outer periphery having a contour, the intersection of the upper surface of the sole portion and the rear surface of the striking wall defining an interior sole line, the intersection of the upper surface of the sole portion and the rearward end of the sole portion defining a trailing-edge sole line; and a region on the upper surface which includes at least a portion of the interior sole line and at least a portion of the trailing-edge sole line, the interior sole line being below the trailing-edge sole line throughout the entirety of the region when the golf club head is in an address position, wherein, in an imaginary vertical plane perpendicular to the front surface of the striking wall and passing through the region, and when the golf club head is in an address position: there is a first path along the upper surface of the sole portion, the first path including a first point and a second point rearward of the first point; the first path is convex and tapers from the trailing-edge to the interior sole line; and the first path has a first instantaneous radius of curvature at the first point, and a second instantaneous radius of curvature at the second point, the second instantaneous radius of curvature being greater than the first instantaneous radius of curvature.