Golf ball

Details Golf ball Golf ball

2007-11-27

2007-11-27

Trimiew, Raeann (Department: 3711)

Games using tangible projectile

Golf

Ball

Reexamination Certificate

active

11050770

ABSTRACT:
A golf ball is composed of a resilient core, a cover which encloses the core, is made primarily of a polyurethane thermoplastic elastomer and has on a surface thereof 250 to 370 dimples, and at least one intermediate layer disposed between the core and the cover. The core has a center portion and a surface portion that is harder than the center portion, the hardness difference expressed in JIS-C hardness units being in a range of 15 to 30, and has a deflection of 1.8 to 4.0 mm when subjected to an increase in load from an initial load state of 98 N (10 kgf) to a load of 1,275 N (130 kgf). The intermediate layer has a Shore D hardness of 55 to 75, and the cover has a Shore D hardness of 30 to 58. The dimples, which are a combination of at least five types having contour lengths at a dimple edge position in a range of 7 to 20 mm, have a total volume of 400 to 700 mm3and a surface coverage relative to an overall surface of the ball of at least 79%.

REFERENCES:
patent: 6565455 (2003-05-01), Hayashi et al.

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