1
Charles Su, Phil Chang: Golf club head. Echelon Golf, Raymond Sun, July 7, 1998: US05776011 (245 worldwide citation)

A metalwood golf club head is provided by attaching three distinct stamped pieces: a face and hosel piece, a crown piece and a bottom piece. The hosel of the face and hosel piece has a diameter and a narrowed section adjacent the heel, the narrowed section having a width from the toe to heel directi ...


2
Charles T Swisshelm: Set of irons with progressive weighting system. Echelon Golf, Raymond Sun, July 25, 1995: US05435559 (23 worldwide citation)

A set of iron golf clubs, with each golf club comprising a shaft and a club head. Each club head comprises a sole, a rear surface and a ball-striking face having a center of percussion. Each club head further comprises a first weight provided adjacent the sole and a second weight provided on the rea ...