| US 7,591,741 B2 | ||
| Multi-layer core golf ball | ||
| Michael J. Sullivan, Barrington, R.I. (US); Derek A. Ladd, Acushnet, Mass. (US); and Edmund A. Hebert, Mattapoisett, Mass. (US) | ||
| Assigned to Acushnet Company, Fairhaven, Mass. (US) | ||
| Filed on Feb. 14, 2008, as Appl. No. 12/31,131. | ||
| Application 12/031131 is a continuation of application No. 11/459477, filed on Jul. 24, 2006, granted, now 7,354,357. | ||
| Application 11/459477 is a continuation in part of application No. 11/061338, filed on Feb. 18, 2005, granted, now 7,331,878. | ||
| Application 11/061338 is a continuation in part of application No. 10/773906, filed on Feb. 06, 2004, granted, now 7,255,656. | ||
| Prior Publication US 2008/0139341 A1, Jun. 12, 2008 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. A63B 37/06 (2006.01) | ||
| U.S. Cl. 473—376 | 15 Claims |
| 1. A golf ball comprising:
an inner core having a compression of less than about 30;
at least one intermediate layer surrounding the inner core having a specific gravity greater than a specific gravity of the
inner core; and
a cover layer surrounding the intermediate layer comprised of an ionomer having an acid content of between 13% and 16%;
wherein the inner core has a hardness less than a hardness of the intermediate layer and wherein a ratio of flexural modulus
(ksi) to Shore D hardness for the cover is less than about 1.0 and a first COR of the inner core and the intermediate layer
is less than a second COR of the entire ball.
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