Patent ID: 7686708

Claim:
A golf club head comprising: a body formed of a metallic material, said body having an inside surface, an outside surface, a heel end, a toe end, a front wall and a rear body portion, said front wall including a face adapted for impacting a golf ball, said rear body portion including a crown, a sole, and a perimeter region extending continuously from said toe end to said heel end, said body further comprising an aperture formed in said crown, said aperture having an arcuate rear edge and a forward edge at least a portion of which is substantially parallel to said face; a solid rear extension comprising a solid wall extending at least 20 millimeters rearward from the crown region of said front wall, the rearward edge of said solid rear extension forming the forward edge of said aperture; a first rib extending into said aperture, said first rib comprising a front edge having a concave portion and a rear edge having a convex portion, the concave and convex portions being positioned opposite each other at the same location along the length of said first rib, said first rib further having a first end attached to said solid rear extension proximal the toe end of said body and a second end attached to said solid rear extension proximal the heel end of said body; a second rib extending into said aperture, said second rib extending from a first medial region of said arcuate rib to said perimeter region; and nonmetallic material extending across and closing said aperture.