Patent ID: 8182366

Claim:
A golf club head oriented in a reference position relative to a ground plane, the golf club head comprising: a strike face including a face center; a hosel including a hosel axis; an imaginary vertical hosel plane containing the hosel axis; an imaginary vertical center plane perpendicular to the imaginary vertical hosel plane and passing through the face center; an imaginary vertical offset plane parallel to the imaginary vertical center plane and spaced a horizontal distance of 20 mm from the imaginary vertical center plane; and a lower transition region comprising: a center anterior nadir located in the imaginary vertical center plane, the center anterior nadir having a height relative to the ground plane; a center posterior nadir located in the imaginary vertical center plane; an imaginary center nadir line passing through the center anterior nadir and the center posterior nadir; a center nadir angle between the ground plane and the imaginary center nadir line; an offset anterior nadir located in the imaginary vertical offset plane; an offset posterior nadir located in the imaginary vertical offset plane; an imaginary offset nadir line passing through the offset anterior nadir and the offset posterior nadir; an offset nadir angle between the ground plane and the imaginary offset nadir line, the offset nadir angle being at least about 5° greater than the center nadir angle; a center nadir distance between the center anterior nadir and the center posterior nadir, the center nadir distance being at least about 8 mm; an offset nadir distance between the offset anterior nadir and the offset posterior nadir, the offset nadir distance being at least about 8 mm; and a center anterior apex located in the imaginary vertical center plane, the center anterior apex having an elevation relative to the center anterior nadir of about 50 mm, a ratio of the height of the center anterior nadir to the elevation of the center anterior apex being at least about 0.12.