Patent ID: 6733400
Filing Date: 2004-05-11
Classification: A63B

Abstract:
A correlated set of individually numbered golf club irons having heads progressing from a high numbered head to a low numbered head; individual heads having a front striking face, a sole, a toe, and a heel; the front striking faces of heads within the set individually having a planar area defining a progressively decreasing loft angle in going from the high numbered head to the low numbered head, the planar area having a top and a bottom, individual front striking faces having a series of grooves of a common cross sectional shape from the top to the bottom; for at least two chosen pairs of heads within the set, the grooves being configured to provide decreasing golf ball spin in going from the lower numbered head to the higher numbered head in the pair if the golf ball were hit by the faces by identical impacts at the same loft angle, the grooves being of different cross sectional shape in the pair; andthe individual grooves having a base and opposing sidewalls which diverge from the base and extend outwardly in the direction of the front striking face; at least one of an opposing sidewall and the base comprising at least one protrusion which extends into the groove, the at least one protrusion having an outermost protruding surface which is curved.