ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,551,763, issued on Feb. 17, was assigned to Sumitomo Rubber Industries Ltd. (Hyogo, Japan).
"Iron golf club head" was invented by Kiyofumi Matsunaga (Kobe, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An iron golf club head includes a face portion having a striking face with a face center thereon, a virtual vertical plane passing through the face center and perpendicular to the striking face, and a sole portion extending backward from the face portion to form a bottom surface of the head. The sole portion includes a toe side slit extending forward from a sole rear edge on the toe side of the virtual vertical plane, a heel side slit extending for...