| US 8,313,394 B2 | ||
| Multilayer core golf ball having hardness gradient within and between each core layer | ||
| Michael J. Sullivan, Barrington, R.I. (US); Brian Comeau, Berkley, Mass. (US); Douglas S. Goguen, New Bedford, Mass. (US); and David A. Bulpett, Boston, Mass. (US) | ||
| Assigned to Acushnet Company, Fairhaven (US) | ||
| Filed on Dec. 10, 2009, as Appl. No. 12/635,025. | ||
| Application 12/635,025 is a continuation in part of application No. 12/469,312, filed on May 20, 2009, granted, now 7,998,002. | ||
| Application 12/469,312 is a continuation in part of application No. 12/469,258, filed on May 20, 2009, granted, now 7,963,863. | ||
| Application 12/469,258 is a continuation in part of application No. 11/829,461, filed on Jul. 27, 2007, granted, now 7,537,530. | ||
| Application 11/829,461 is a continuation in part of application No. 11/772,903, filed on Jul. 3, 2007, granted, now 7,537,529. | ||
| Application 11/829,461 is a continuation in part of application No. 12/635,025. | ||
| Application 12/635,025 is a continuation in part of application No. 12/492,514, filed on Jun. 26, 2009, granted, now 8,025,594. | ||
| Application 12/492,514 is a continuation in part of application No. 12/558,732, filed on Sep. 14, 2009, granted, now 7,857,715. | ||
| Application 12/558,732 is a continuation in part of application No. 12/558,726, filed on Sep. 14, 2009. | ||
| Application 12/558,726 is a continuation of application No. 12/186,877, filed on Aug. 6, 2008, granted, now 7,803,069. | ||
| Application 12/186,877 is a continuation of application No. 11/832,197, filed on Aug. 1, 2007, granted, now 7,410,429. | ||
| Application 11/832,197 is a continuation in part of application No. 11/829,461, filed on Jul. 27, 2007, granted, now 7,537,530. | ||
| Application 11/829,461 is a continuation in part of application No. 11/772,903, filed on Jul. 3, 2007, granted, now 7,537,529. | ||
| Prior Publication US 2010/0160083 A1, Jun. 24, 2010 | ||
| Int. Cl. A63B 37/06 (2006.01) | ||
| U.S. Cl. 473—373 | 18 Claims |
| 1. A golf ball comprising:
a two layer core and a cover disposed about the two layer core,
the two layer core comprising an inner core layer and an outer core layer disposed about the inner core layer,
said inner core layer comprising a geometric center and a first outer surface and being formed from a substantially homogenous
formulation and having a diameter of about 30 mm or lower and having a plurality of hardnesses of from about 50 Shore C to
about 80 Shore C,
the geometric center comprising a first hardness and the first outer surface comprising a second hardness wherein the first
hardness is different than the second hardness to define a positive or negative hardness gradient of about 20 Shore C or lower;
said outer core layer comprising an inner surface and a second outer surface and being formed from a substantially homogenous
formulation and comprising a thickness of about 10 mm or lower and having a plurality of hardnesses of from about 50 Shore
C to about 80 Shore C, wherein the inner surface comprises a third hardness and the second outer surface comprises a fourth
hardness, wherein the fourth hardness is less than the third hardness to define a negative hardness gradient of about 15 Shore
C or lower,
the outer core layer further comprising a fifth hardness disposed between the inner surface and the second outer surface in
a region extending between about 10% and about 90% of the distance from the inner surface to the second outer surface, wherein
the fifth hardness is greater than the third hardness and the fourth hardness; and
wherein the fourth hardness is less than the first hardness to define a negative hardness gradient of about 15 Shore C or
lower.
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