Patent ID: 9314678
Filing Date: 2016-04-19
CPC Classification: A63B,C25D

Claim Text:
1. A golf club head comprising: a ball-striking face, wherein the ball-striking face is associated with a first hardness; and a protective aluminum oxide layer coupled to the ball-striking face, wherein the protective aluminum oxide layer is associated with a second hardness, and wherein the second hardness is greater than the first hardness; the ball-striking face comprises, by weight, about 0.8% to about 1.2% magnesium, about 0.4% to about 0.8% silicon, about 0.15% to about 0.40% copper, and about 0.04% to about 0.35% chromium; the second hardness is about 100 in Brinell scale; wherein a thickness of the ball-striking face is reduced in order to reduce weight of the ball-striking face by at least 10 grams, wherein the at least 10 grams of weight is redistributed to move a center of gravity of the golf club head away from the ball-striking face and lower the center of gravity toward the bottom portion of the golf club head; wherein the golf club head is associated with a moment of inertia about a Y axis of the golf club head, the moment of inertia ranging from about 4100 g-cm wherein the golf club head is associated with a moment of inertia about an X axis of the golf club head, the moment of inertia ranging from about 800 g-cm wherein the golf club head is associated with a moment of inertia about a Z axis of the golf club head, the moment of inertia ranging from about 1100 g-cm