Golf ball with negative hardness gradient core
First Claim
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1. A golf ball comprising:
- an inner core having a first outer surface and a geometric center and being formed from a first substantially homogenous formulation throughout such that the inner core has a hardness of 35 to 55 Shore C;
an outer core layer disposed about the inner core having a second outer surface and an inner surface and being formed from a second substantially homogenous formulation throughout such that the outer core layer has a hardness of 55 to 90 Shore C; and
a cover layer disposed about the outer core layer;
wherein the geometric center, the first and second outer surfaces, and the inner surface each have a hardness, the hardness of the first outer surface being lower than the hardness of the geometric center to define a first negative hardness gradient, and the hardness of the second outer surface being lower than the hardness of the inner surface to define a second negative hardness gradient.
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Abstract
A golf ball including an inner core having a first outer surface and a geometric center, the inner core having a hardness of 35 to 55 Shore C; an outer core layer adjacent the inner core having a second outer surface and an inner surface, the outer core layer having a hardness of 55 to 90 Shore C; and a cover layer; wherein the hardness of the first outer surface is substantially the same as or lower than the hardness of the geometric center to define a first negative hardness gradient, and the hardness of the second outer surface is substantially the same as or lower than the hardness of the inner surface to define a second negative hardness gradient.
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Citations
20 Claims
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1. A golf ball comprising:
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an inner core having a first outer surface and a geometric center and being formed from a first substantially homogenous formulation throughout such that the inner core has a hardness of 35 to 55 Shore C; an outer core layer disposed about the inner core having a second outer surface and an inner surface and being formed from a second substantially homogenous formulation throughout such that the outer core layer has a hardness of 55 to 90 Shore C; and a cover layer disposed about the outer core layer; wherein the geometric center, the first and second outer surfaces, and the inner surface each have a hardness, the hardness of the first outer surface being lower than the hardness of the geometric center to define a first negative hardness gradient, and the hardness of the second outer surface being lower than the hardness of the inner surface to define a second negative hardness gradient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A golf ball comprising:
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an inner core having a first outer surface and a geometric center and being formed from a first substantially homogenous formulation throughout such that the inner core has a hardness of 60 to 90 Shore C; an outer core layer having a second outer surface and an inner surface and being formed from a second substantially homogenous formulation throughout such that the outer core layer has a hardness of 45 to 70 Shore C; and a cover layer; wherein the geometric center, the first and second outer surfaces, and the inner surface each have a hardness, the hardness of the first outer surface being lower than the hardness of the geometric center to define a first negative hardness gradient, and the hardness of the second outer surface being lower than the hardness of the inner surface to define a second negative hardness gradient. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A golf ball comprising:
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an inner core having a first outer surface and a geometric center and being formed from a first substantially homogenous formulation throughout such that the inner core has a hardness of 40 to 80 Shore C; an outer core layer disposed about the inner core having a second outer surface and an inner surface and being formed from a second substantially homogenous formulation throughout such that the outer core layer has a hardness of 60 to 90 Shore C; and a cover layer comprising at least two layers disposed about the outer core layer; wherein the geometric center, the first and second outer surfaces, and the inner surface each have a hardness, the hardness of the first outer surface being lower than the hardness of the geometric center to define a first negative hardness gradient, the hardness of the second outer surface being lower than the hardness of the inner surface to define a second negative hardness gradient; and wherein the hardness of the inner surface and the first outer surface are substantially the same to form a continuous negative hardness gradient across the inner core and outer cover layer. - View Dependent Claims (20)
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Specification