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US 7,452,292 B2Granted
Golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorsAtsuki Kasashima, Katsunori Sato
Life of this patent
Estimating the term…
Abstract
In a golf ball having, on a spherical surface, numerous dimples in a plurality of types of differing diameter, the dimples include smallest size dimples having a diameter of 2.7 mm or less and largest size dimples having a diameter of 4.3 mm or less. At least 50% of the total number of dimples are dimples in which an arc that connects mutually opposing positions on a wall of the dimple at a 70% dimple depth level with a deepest position on the dimple wall has a radius of curvature R of at least 15 mm.
Claims26
A golf ball comprising:
- a resilient solid core comprising at least two discrete layers;
- and
- a plurality of dimples in a plurality of types of differing diameters and disposed on a spherical surface, wherein the dimples include smallest size dimples having a diameter of 2.7 mm or less and largest size dimples having a diameter of 4.3 mm or more, and at least 50% of the total number of dimples are dimples in which an arc that connects mutually opposing positions on a wall of the dimple at a 70% dimple depth level with a deepest position on the dimple wall has a radius of curvature R of at least 15 mm,
- wherein a top edge of the dimples and their vicinity have an arcuate shape having a radius of curvature, and the radius of curvature prior to painting is within the range 0.3 to 3 mm.
1 more element
A golf ball comprising:
- a resilient solid core;
- a plurality of dimples in a plurality of types of differing diameters and disposed on a spherical surface, wherein the dimples include smallest size dimples having a diameter of 2.7 mm or less and largest size dimples having a diameter of 4.3 mm or more, and at least 50% of the total number of dimples are dimples in which an arc that connects mutually opposing positions on a wall of the dimple at a 70% dimple depth level with a deepest position on the dimple wall has a radius of curvature R of at least 15 mm;
- a cover made primarily of polyurethane elastomer that is disposed outside of the solid core and has thereon said dimples;
- and
- an intermediate layer made primarily of ionomer resin that is disposed between the cover and the solid core,
- wherein the core has a two-layer construction composed of an inner layer and an outer layer, said outer layer having a thickness of 5 to 15 mm.
3 more elements
A golf ball comprising:
- a plurality of dimples in a plurality of types of differing diameters and disposed on a spherical surface, wherein the dimples include smallest size dimples having a diameter of 2.7 mm or less and largest size dimples having a diameter of 4.3 mm or more, and at least 50% of the total number of dimples are dimples in which an arc that connects mutually opposing positions on a wall of the dimple at a 70% dimple depth level with a deepest position on the dimple wall has a radius of curvature R of at least 15 mm,
- wherein an angle θ between a tangent J drawn at a 30% dimple depth position on the dimple wall and a circular plane formed by connecting top edge areas of the dimple is from 4 to 15°.
Dependencies are inferred from the claim text.