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Golf ball with negative hardness gradient core

  • US 7,537,530 B2
  • Filed: 07/27/2007
  • Issued: 05/26/2009
  • Est. Priority Date: 07/03/2007
  • Status: Expired due to Fees
First Claim
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1. A golf ball comprising:

  • an inner core having a first outer surface and a geometric center and being formed from a first substantially homogenous formulation throughout such that the inner core has a hardness of 35 to 55 Shore C;

    an outer core layer disposed about the inner core having a second outer surface and an inner surface and being formed from a second substantially homogenous formulation throughout such that the outer core layer has a hardness of 55 to 90 Shore C; and

    a cover layer disposed about the outer core layer;

    wherein the geometric center, the first and second outer surfaces, and the inner surface each have a hardness, the hardness of the first outer surface being lower than the hardness of the geometric center to define a first negative hardness gradient, and the hardness of the second outer surface being lower than the hardness of the inner surface to define a second negative hardness gradient.

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