Patent 11504587 was granted and assigned to Sumitomo Rubber Industries on November, 2022 by the United States Patent and Trademark Office.
A golf club head has a hollow therein and comprises a face portion, a crown portion and a sole portion. The face portion comprises a central zone including a face center, and a peripheral zone surrounding the central zone. Each of the central zone and the peripheral zone has a flexural stiffness defined by E×t