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US 6,656,060 B2Granted
Golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorsYutaka Masutani, Junji Hayashi, Hisashi Yamagishi
Life of this patent
Estimating the term…
Abstract
A golf ball includes a solid core and a cover of at least one layer; wherein each of a specific gravity of the solid core and a specific gravity of the cover is nearly equal to a value (S) of a relation expression given by S=W/[(π/6)×D3], where W is a weight of the golf ball and D is a diameter of the golf ball. The golf ball can enhance the durability to increase the carry of the ball with less variations in carry of the ball.
Claims4
A solid golf ball comprising a solid core and a cover of at least one layer;
- wherein each of a specific gravity of said solid core and a specific gravity of said cover is nearly equal to a value (S) of a relation expression given by:
- S=W/[(π/6)×D3]
- where W is a weight of said golf ball in a range of 45.1 to 45.9 g and D (cm) is a diameter of said golf ball,
- a surface hardness of said solid core is higher than a center hardness of said solid core by 8 to 20 in JIS-C hardness,
- a surface hardness of said golf ball is higher than a center hardness of said solid core by 20 to 45 in JIS-C hardness and a surface hardness of said golf ball is higher than a surface hardness of said solid core by 10 to 30 in JIS-C hardness, and
- a flexural amount of said golf ball, measured by applying a load of 98 to 1274N thereto, is in a range of 3.5 to 6.0 mm.
3 more elements
A golf ball comprising a solid core and a cover of at least one layer;
- wherein each of a specific gravity of said solid core and a specific gravity of said cover is nearly equal to a value (S) of a relation expression given by:
- S=W/[(π/6)×D3];
- where W is a weight of said golf ball in a range of 45.1 to 45.9 g and D (cm) is a diameter of said golf ball;
- a surface hardness of said solid core is higher than a center hardness of said solid core by 8 to 20 in JIS-C hardness;
- a surface hardness of said golf ball is higher than a center hardness of said solid core by 20 to 45 in JLS-C hardness and a surface hardness of said golf ball is higher than a surface hardness of said solid core by 10 to 30 in JIS-C hardness;
- a flexural amount of said golf ball, measured by applying a load of 98 to 1274N thereto, is in a range of 3.5 to 6.0 mm;
- and
- wherein said golf ball is a two-piece solid golf ball including a solid core and a cover of one layer.
5 more elements
Dependencies are inferred from the claim text.