Golf ball

Details Golf ball Golf ball

2005-05-31

2005-05-31

Gorden, Raeann (Department: 3711)

Games using tangible projectile

Golf

Ball

Reexamination Certificate

active

06899643

ABSTRACT:
A golf ball comprises a large number of dimples (4) on a surface thereof. The dimple (4) includes a first curved surface (7) provided from a position (P2) placed downward by 85% of a depth to a position (P1) placed downward by 100% of the depth in a direction of the depth from an edge (E) and a second curved surface (8) provided from a position (P5) placed downward by 20% of the depth to a position (P3) placed downward by 50% of the depth in the direction of the depth from the edge (E). A percentage, to a total number of the dimples, of a number of the dimples in which a ratio (R1/R2) of a radius of curvature (R1) of the first curved surface (7) to a radius of curvature (R2) of the second curved surface (8) is 5 to 55 is 20% or more. A third curved surface (9) is present between the first curved surface (7) and the second curved surface (8). A fourth curved surface (10) is present between the second curved surface (8) and the edge (E). A distance (F) between the deepest portion (P2) of the dimple (4) and a phantom sphere (6) is 0.10 mm to 0.60 mm.

REFERENCES:
patent: 5735757 (1998-04-01), Moriyama
patent: 6368238 (2002-04-01), Kasashima et al.
patent: 2004/0102259 (2004-05-01), Ohama et al.

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