Patent 7399238 was granted and assigned to Callaway Golf Company on July, 2008 by the United States Patent and Trademark Office.
The iron golf club head (20) of the present invention is preferably composed of three main components: a periphery member 22, a central member 24 and a nanocrystalline plated face plate 26. The periphery member (22) is preferably composed of a high density material such as a nickel-tungsten alloy. The central member (24) is preferably composed of a lightweight, non-metal material. The face plate (26) is preferably composed of a non-metal material plated with a nanocrystalline material. The iron golf club head (20) preferably has high moments of inertia Izz and Ixx.