Golf ball
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United States of America Patent
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Feb 13, 2018
Issued Date -
N/A
app pub date -
Sep 30, 2016
filing date -
Oct 20, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
In a multi-piece solid golf ball having a core, a cover and an intermediate layer therebetween, letting Hc be the JIS-C hardness at the core center, H12 be the JIS-C hardness at a position 12 mm from the core center and Ho be the JIS-C hardness at the core surface, the core has a hardness profile which satisfies the conditions 0≦H12−Hc≦15, 15≦Ho−H12≦30, (Ho−H12)−(H12−Hc)≧10 and 20≦Ho−Hc≦40. Also, letting A be the value represented by (Ho−H12)−(H12−Hc), the spin index of the ball, defined as the dynamic coefficient of friction for the ball multiplied by A, is at least 3.0. This golf ball can satisfy at a high level the flight and control performance relied on by professional golfers and skilled amateurs.
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