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Golf ball

  • US 7,029,406 B2
  • Filed: 03/25/2004
  • Issued: 04/18/2006
  • Est. Priority Date: 03/28/2003
  • Status: Expired due to Fees
First Claim
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1. A golf ball comprising an elastic core, an intermediate layer of at least one layer formed of at least one ionomer resin enclosing the elastic core, and a cover which is formed of at least one thermoplastic or thermosetting urethane resin and provided on its surface with a plurality of dimples, whereinthe cover has a gage of 1.0 to 1.5 mm, and a Shore D hardness of 45 to 63,the intermediate layer has a gage of 1.0 to 2.0 mm per layer and a Shore D hardness of 50 to 70, and which is harder than the hardness of the cover,wherein a phantom sphere is given on the assumption that the cover surface is free of dimples, the total of the volumes of dimple spaces each delimited by a concave wall of a dimple and the surface of the phantom sphere is 1.1 to 1.6% of the volume of the phantom sphere, andthe golf ball in its entirety has a specific gravity of at least 1.128 g/cm3.

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