Patent 6976924 was granted and assigned to Acushnet Company on December, 2005 by the United States Patent and Trademark Office.
A golf club iron having a thin front face which is supported by a biasly bent L-shaped insert that is disposed into a rear cavity of the iron to both support the front face and to create a “spring like” effect. The coefficient of restitution of the club head is greater than 0.8. The insert has a lower specific gravity and a higher Young's Modulus than the front face.