Patent ID: 8616998

Claim:
A club head comprising: a strike portion comprising: a strike face comprising a first groove; a back face opposite the strike face; and a first trench set at the back face; wherein: the club head comprises at least one of a wedge-type head or an iron-type head; the first trench set comprises: a first trench comprising: first and second first-trench shallow portions; first, second, and third first-trench deep portions; a first trench centerline extending along a center of each of the first-trench shallow portions and of each of the first-trench deep portions; a second trench comprising: first and second second-trench shallow portions; first, second, and third second-trench deep portions; and a first rib between the first and second trenches; the first first-trench shallow portion is: bounded by both the first and second first-trench deep portions; and shallower than each of the first and second first-trench deep portions; the second first-trench shallow portion is: bounded by both the second and third first-trench deep portions; and shallower than each of the second and third first-trench deep portions; the first rib comprises a first rib centerline parallel to the first trench centerline; centerpoints of the first first-trench deep portion and of the first second-trench deep portion lie along a first line that perpendicularly intersects the first rib centerline; and centerpoints of the second first-trench deep portion and of the second second-trench deep portion lie along a second line that perpendicularly intersects the first rib centerline.