Patent 6994635 was granted and assigned to Acushnet Company on February, 2006 by the United States Patent and Trademark Office.
A golf club head is provided with a residual compressive stress layer on the inside surface of the club face using a peening treatment. The peening treatment also may remove material from the club head, such as unwanted alpha case on a titanium club head. The body of the club head further may be subjected to a peen treatment.