Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Masayoshi Nishio0
Masaya Tsunoda0
Date of Patent
February 24, 2009
Patent Application Number
11282773
Date Filed
November 21, 2005
Patent Citations Received
...
Patent Primary Examiner
Patent abstract
A face backside of a golf club head is provided with six or more ribs extended from a face center toward face circumferences. Angles θ1 to θ6 between respective pairs of adjoining ones of the ribs are less than 90°. One of the ribs that form the smallest angle between its extension direction and a head vertical direction d1 and that extends from the face center toward a crown-side face circumference constitutes an upward rib, which has a smaller cross-sectional area than any of those of the other ribs.
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