Golf ball

Details Golf ball Golf ball

2009-01-23

2011-12-27

Gorden, Raeann (Department: 3711)

Games using tangible projectile

Golf

Ball

Reexamination Certificate

active

08083613

ABSTRACT:
The invention provides a golf ball with a surface having a plurality of dimples formed thereon. The number of dimples is at least 250 and not more than 400, the dimples have a surface coverage (SR) of at least 70% and a volume ratio (VR) of at least 1.1%, are of at least three types and have an average depth of at least about 0.18 mm and a diameter (DM) to depth (DP) ratio (DM/DP) of not more than about 22. The (total number of Db)/(total number of Da) ratio, where Da represents dimples having a diameter of at least 3.7 mm and Db represents dimples having a diameter of less than 3.7 mm, is at least about 0.005 and not more than about 1. The ball has a coefficient of lift CL at a Reynolds number of 70,000 and a spin rate of 2,000 rpm which is maintained at 60% or more of the coefficient of lift CL at a Reynolds number of 80,000 and a spin rate of 2,000 rpm. The golf ball of the invention lowers fluctuations in lift and drag at high and low spin rates, enabling a stable trajectory to be achieved.

REFERENCES:
patent: 5601503 (1997-02-01), Yamagishi et al.
patent: 5782702 (1998-07-01), Yamagishi et al.
patent: 5782703 (1998-07-01), Yamagishi et al.
patent: 6726579 (2004-04-01), Ohama et al.
patent: 5-103846 (1993-04-01), None
patent: 10-43342 (1998-02-01), None
patent: 10-43343 (1998-02-01), None
patent: 2000-107338 (2000-04-01), None
DuPont Surlyn 8945 Thermoplastic Ionomer Resin material data sheet.

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