Golf club head

Details Golf club head Golf club head

2005-05-03

2010-12-28

Hunter, Alvin A (Department: 3711)

Games using tangible projectile

Golf

Club or club support

Reexamination Certificate

active

07857712

ABSTRACT:
An iron-type golf club head has a face which has a face surface of a flat shape, and a hosel which is continuous with the face on its heel side. A shaft insertion hole is disposed in the hosel. A protrusion protruding rearward is disposed in the vicinity of the center in a toe-heel direction. A material of the golf club head is pure iron having a high purity of at least 99.8%, for instance, pure iron having a purity within a range of 99.995 to 99.9999%. The golf club head is subjected to carburizing so that carbon diffuses up to about 0.2 to 0.5 mm from the surface. A region within 0.2 mm from the face surface has a hardness of HV 300 to 600, and a region where a distance from the face surface is 0.7 mm or more has a hardness of HV 100 or lower.

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Jackson, Jeff. THe Modern Guide to Golf Clubmaking. Ohio: Dynacraft Golf Products, Inc., copyright 1994, p. 237.
Japanese Office Action dated Dec. 14, 2009 issued in Application No. 2004-138774, 6 pages.
Notification of Reason for Refusal dated Mar. 30, 2010, in counterpart Japanese Application No. 2004-138774.

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