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US 5,961,401 AGranted
Golf balls
AssigneeBridgestone Sports Co., Ltd.
InventorsYutaka Masutani, Keisuke Ihara, Hirotaka Shimosaka, Michio Inoue, Atsuki Kasashima
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AssigneeBridgestone Sports Co., Ltd.
InventorsYutaka Masutani, Keisuke Ihara, Hirotaka Shimosaka, Michio Inoue, Atsuki Kasashima
Estimating the term…
A golf ball is composed of at least a pair of adjacent concentric solid layers or three adjacent concentric solid layers. In the former case, the outer solid layer is composed of a matrix and non-metallic high-hardness grains having hardness higher than that of the matrix which has a Shore D range of 36-40. In the later case, the intermediate solid layer is composed of a matrix and high-hardness grains having hardness higher than that of the matrix. The high-hardness grains have a Shore D hardness in the range of 50-70 and penetrate the corresponding solid layer in normal directions. The golf ball can provide a player with different feels on impact depending on the direction of an external force applied thereto when the golf ball is hit.
A golf ball comprising at least a pair of adjacent concentric solid layers, wherein an outer concentric solid layer of said adjacent concentric solid layers comprises a matrix and non-metallic high-hardness grains homogeneously arranged, said high-hardness grains having hardness higher than that of said matrix, and said high-hardness grains penetrating said outer concentric solid layer substantially in normal directions.
A golf ball comprising three adjacent concentric solid layers, wherein an intermediate concentric solid layer of said adjacent concentric solid layers comprises a matrix and high-hardness grains, said high-hardness grains having hardness higher than that of said matrix, and said high-hardness grains penetrating said intermediate concentric solid layer substantially in normal directions.
A golf ball comprising a core, an intermediate layer and a cover, wherein said core being formed of polybutadiene rubber having a hardness of from 40 to 55 on the Shore D scale, said intermediate layer comprises a matrix and high-hardness grains, said high-hardness grains having hardness higher than that of said matrix and being formed of hard resin having a hardness of from 50 to 70 on the Shore D scale, and said high-hardness grains penetrating said intermediate layer substantially in normal directions.
Dependencies are inferred from the claim text.