1
Donald J C Sun, Wen J Tai: Golf driver with variable weighting for changing center of gravity. Cipa Manufacturing Corporation, Edward A Sokolski, September 24, 1991: US05050879 (203 worldwide citation)

A golf club head has three cavities spaced along the sole of the head. A set of weight members having various weights is provided. Such weight members are selectively installed in the cavities to vary the center of gravity of the club head horizontally, between the toe and heel of the head to modify ...


2
Donald J C Sun, Wen J Tai: Golf driver with variable weighting for changing center of gravity. Cipa Manufacturing Corporation, Edward A Sokolski, May 7, 1991: US05013041 (58 worldwide citation)

A golf club head has a pair of parallel longitudinal chambers running thereacross behind the face plate. A set of weight members having various weights is provided. Such weight members are selectively installed in the chambers to vary the center of gravity of the club head both horizontally and vert ...