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US 9,314,672 B2Granted
Multi-layer core golf ball
AssigneeAcushnet Company
InventorsMichael J. Sullivan, Derek A. Ladd
Life of this patent
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Abstract
Golf balls comprising a multi-layer core and a cover are disclosed. The multi-layer core comprises a zero or positive hardness gradient center that is hard relative to an intermediate core layer. The overall core preferably has a zero hardness gradient, a negative hardness gradient, or a positive hardness gradient of up to 20 Shore C units.
Claims7
A golf ball comprising a core and a cover, wherein the core has an overall diameter of from 1.40 inches to 1.62 inches and comprises:
- a center having a diameter of from 0.100 inches to 0.950 inches, a center Shore C hardness (Hcenter) of 90 or less, an outer surface Shore C hardness (Hcenter surface) of 75 or greater, wherein Hcenter surface>Hcenter;
- an intermediate core layer having an outer surface Shore C hardness (Hintermediate) of 85 or less;
- and
- an outer core layer having an outer surface Shore C hardness (Houter core) of 80 or greater;
- wherein Hintermediate<Hcenter surface, Hintermediate<Houter core, and Houter core−Hcenter is from −25 to 40;
- and wherein the cover consists of:
- an inner cover layer having an outer surface hardness of 65 Shore D or greater and a thickness of from 0.020 inches to 0.080 inches, and
- an outer cover layer having an outer surface hardness of 60 Shore D or less and a thickness of from 0.015 inches to 0.055 inches.
5 more elements
Dependencies are inferred from the claim text.