| US 8,303,437 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. 12/635,361. | ||
| Application 12/635,361 is a continuation of application No. 12/635,201, filed on Dec. 10, 2009. | ||
| Application 12/635,201 is a continuation in part of application No. 12/635,143, filed on Dec. 10, 2009. | ||
| Application 12/635,143 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. 12/492,570, filed on Jun. 26, 2009, granted, now 8,197,359. | ||
| Application 12/492,570 is a continuation in part of application No. 12/492,514, filed on Jun. 26, 2009, granted, now 8,025,594. | ||
| 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 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. | ||
| Application 11/829,461 is a continuation in part of application No. 11/772,903. | ||
| Prior Publication US 2010/0087276 A1, Apr. 8, 2010 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. A63B 37/06 (2006.01) | ||
| U.S. Cl. 473—373 | 19 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 less and having a hardness 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 greater than the second hardness to define a negative hardness gradient of about 23 Shore C or less;
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 less and having a hardness of from about 40 Shore C to about 75 Shore
C,
the inner surface comprising a third hardness and the second outer surface comprising a fourth hardness, wherein the fourth
hardness is greater than the third hardness,
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 less than the third hardness and the fourth hardness, and
wherein the fourth hardness is less than the first hardness to define a two layer core having a negative hardness gradient
of no greater than about 15 Shore C.
|