Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Akio Yamamoto0
Date of Patent
March 28, 2006
0Patent Application Number
102466680
Date Filed
September 19, 2002
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A golf clubhead comprises a face portion having a back surface which is provided around a center region with at least two annular grooves so that the face portion is provided with at least two annular thin parts each being thinner than the center region and at least one rib part between the thin parts, whereby the rebound performance and durability of the face portion can be improved.
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