| US 8,317,637 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, Mass. (US) | ||
| Filed on Dec. 10, 2009, as Appl. No. 12/635,064. | ||
| Application 12/635,064 is a continuation in part of application No. 12/635,025, filed on Dec. 10, 2009. | ||
| 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 12/635,025 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 in part of application No. 12/492,514, filed on Jun. 26, 2009, granted, now 8,025,594. | ||
| Application 12/558,732 is a continuation of application No. 12/186,877, filed on Aug. 6, 2008, granted, now 7,803,069. | ||
| Application 12/558,726 is a continuation of application No. 12/186,877. | ||
| 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. | ||
| Application 11/829,461 is a continuation in part of application No. 11/772,903. | ||
| Prior Publication US 2010/0160084 A1, Jun. 24, 2010 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. A63B 37/06 (2006.01) | ||
| U.S. Cl. 473—373 | 34 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 hardnesses of from about 40 Shore C to about
85 Shore C,
the geometric center comprising a first hardness and the first outer surface comprising a second hardness wherein the second
hardness is greater than the first hardness to define a positive hardness gradient of about 20 Shore C or greater;
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 hardnesses of from about 65 Shore C
to about 95 Shore C, wherein the inner surface comprises a third hardness and the second outer surface comprises a fourth
hardness, wherein the fourth hardness is greater than the third hardness to define a positive hardness gradient of about 20
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 greater than the first hardness to define a positive hardness gradient of about 30 Shore C
or greater.
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