| US 7,537,530 B2 | ||
| Golf ball with negative hardness gradient core | ||
| David A. Bulpett, Boston, Mass. (US); Brian Comeau, Berkley, Mass. (US); Derek A. Ladd, Acushnet, Mass. (US); and Michael J. Sullivan, Barrington, R.I. (US) | ||
| Assigned to Acushnet Company, Fairhaven, Mass. (US) | ||
| Filed on Jul. 27, 2007, as Appl. No. 11/829,461. | ||
| Application 11/829461 is a continuation in part of application No. 11/772903, filed on Jul. 03, 2007. | ||
| Prior Publication US 2009/0011857 A1, Jan. 08, 2009 | ||
| Int. Cl. A63B 37/06 (2006.01) | ||
| U.S. Cl. 473—374 | 20 Claims |
| 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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