IP Library Granted Patent US 9,656,125
Granted Patent B2
US 9,656,125 · App. 13/479,326 · Granted May 23, 2017

Golf ball

Inventor: Hirotaka Nakamura (Kobe, JP)
Assignee: DUNLOP SPORTS CO. LTD.
A63B37/0004A63B37/002A63B37/0016A63B37/0017A63B37/0018A63B37/0021
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Quick Facts
Patent No.
US 9,656,125
App. No.
13/479,326
Granted
May 23, 2017
Kind
B2
Abstract

A golf ball 2 has, on a surface thereof, a plurality of types of dimples 8 having different diameters from each other. A standard deviation Vσ of the volumes of all the dimples 8 is equal to or less than 0.095 mm 3 . The ratio (Vσ/Dσ) of the standard deviation Vσ to a standard deviation Dσ of the diameters of all the dimples 8 is equal to or less than 0.35. Preferably, the shape of each dimple 8 is a portion of a spherical surface. The standard deviation Vσ is preferably equal to or less than 0.087 mm 3 . The ratio (Vσ/Dσ) is preferably equal to or less than 0.29.

Claims (13)

1. A golf ball having, on a surface thereof, a plurality of types of dimples, each of the types having different diameters from the other types,

wherein

a total volume of all said dimples ranges from 280 mm 3 to 340 mm 3 ,

a standard deviation Vσ of volumes of all the dimples is equal to or less than 0.095 mm 3 , a depth of each dimple ranges from 0.07 mm to 0.22 mm,

a ratio (Vσ/Dσ) of the standard deviation Vσ to a standard deviation Dσ of diameters of all the dimples is equal to or less than 0.35,

a total number of the dimples ranges from 270 to 350, and

a ratio of a sum of areas of all the dimples to a surface area of a phantom sphere of the golf ball is equal to or greater than 75% but equal to or less than 95%.

2. The golf ball according to claim 1 , wherein a shape of each dimple is a portion of a spherical surface.

3. The golf ball according to claim 1 , wherein the standard deviation Vσ is equal to or less than 0.087 mm 3 .

4. The golf ball according to claim 1 , wherein the ratio (Vσ/Dσ) is equal to or less than 0.29.

5. The golf ball according to claim 1 , wherein the sum of the volumes of all the dimples is equal to or greater than 280 mm 3 but equal to or less than 330 mm 3 .

6. The golf ball according to claim 1 , wherein the ratio of the areas of all the dimples is equal to or greater than 80% but equal to or less than 95%.

7. The golf ball according to claim 1 , wherein a number of types of the dimples is equal to or greater than 4.

Assignments (3)
MERGER Recorded Apr 17, 2018
From: DUNLOP SPORTS CO. LTD.
To: SUMITOMO RUBBER INDUSTRIES, LTD.
Reel/Frame 045959/0204 →
CHANGE OF NAME Recorded Apr 14, 2017
From: SRI SPORTS LIMITED
To: DUNLOP SPORTS CO. LTD.
Reel/Frame 042015/0919 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 25, 2012
From: NAKAMURA, HIROTAKA
To: SRI SPORTS LIMITED
Reel/Frame 028272/0373 →
Priority Claims (1)
JP 2011-143656 · Jun 29, 2011 · national
Continuity (1)
Related Publication 20130005509A1 · Jan 3, 2013