1
Stephen C Ahn, Suh Yong Lee: Golf club with adjustable total weight, center of gravity and balance. Alfred F Hoyte Jr, January 18, 2000: US06015354 (270 worldwide citation)

Improved golf club heads including irons, woods and putters have built-in provisions to change the weight of the golf club head including a way to increase, decrease or adjust the position and the amount of weights in a selected golf club head so as to enable the player to adjust the club's center o ...


2
Stephen C Ahn, Suh Yong Lee: Golf putter having improved marking. Alfred F Hoyte Jr, June 25, 2002: US06409610 (13 worldwide citation)

A putter is precision machined to form a concave horizontal face from the heel to toe of the hitting face. The curvature of the concave horizontal face may range from an arc of a five circle to an arc of a one-feet radius circle with the center point at the center of the hole. Thus the putter has a ...


3
Stephen C Ahn, Suh Yong Lee: Golf putter with horizontal concavity in striking face. Alfred F Hoyte Jr, April 4, 2000: US06045452 (10 worldwide citation)

A golf putter has the hitting face with horizontally concave surfaces. The curvatures of the concave horizontal faces range arcs of five to one-foot radius circles.


4
Stephen C Ahn, Suh Yong Lee: Golf putter having improved marking. Baker & McKenzie, January 16, 2007: USRE039472

A putter is precision machined to form a concave horizontal face from the heel to toe of the hitting face. The curvature of the concave horizontal face may range from an arc of a five circle to an arc of a one-feet radius circle with the center point at the center of the hole. Thus the putter has a ...