# US 9,750,982 B2 · Golf ball

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- Number: US 9,750,982 B2
- Document ID: US9750982B2
- Status: Granted
- Kind: B2
- Application number: 14/933,192
- Filed: 2015-11-05
- Published: 2016-06-30
- Granted: 2017-09-05
- Earliest claimed: 2014-12-26
- Assignees: Dunlop Sports Co. Ltd.
- Applicants: Dunlop Sports Co. Ltd.
- Inventors: Kohei Mimura; Takahiro Sajima; Hironori Takihara
- Web page: https://patentgrep.com/patent/US9750982B2

## CPC

- A63B 37/0021: {Occupation ratio, i.e. percentage surface occupied by dimples}
- A63B 37/0006: {Arrangement or layout of dimples}
- A63B 37/0017: {Specified total dimple volume}
- A63B 37/0018: {Specified number of dimples}
- A63B 37/0019: {Specified dimple depth}
- A63B 37/002: {Specified dimple diameter}
- A63B 37/0029: {Physical properties}
- A63B 37/004: {Physical properties}
- A63B 37/0047: {Density; Specific gravity}
- A63B 37/0075: {Three piece balls, i.e. cover, intermediate layer and core}
- A63B 37/0076: {Multi-piece balls, i.e. having two or more intermediate layers}
- A63B 37/0077: {Physical properties}
- A63B 37/00921: {whereby hardness of the cover is higher than hardness of the intermediate layers}
- A63B 37/0012: {Dimple profile, i.e. cross-sectional view}
- A63B 37/0031: {Hardness}
- A63B 37/0033: {Thickness}
- A63B 37/0043: {Hardness}
- A63B 37/0045: {Thickness}
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)

## Abstract

A golf ball has a large number of dimples 10 on a surface thereof. The dimples 10 include a plurality of small dimples 10S each having an area of less than 8.0 mm2, and a plurality of large dimples 10L each having an area of equal to or greater than 8.0 mm2. A ratio PS of a sum of areas of all the small dimples 10S to a surface area of a phantom sphere of the golf ball is less than 2.0%. A ratio PL of a sum of areas of all the large dimples 10L to the surface area of the phantom sphere is equal to or greater than 79.0%. A degree G of uniformity of areas of the large dimples 10L is equal to or less than 1.15.

## Claims

### Claim 1

A golf ball having a large number of dimples on a surface thereof, wherein
the dimples include a plurality of small dimples each having an area of less than 8.0 mm2, and a plurality of large dimples each having an area of equal to or greater than 8.0 mm2,
a ratio PS of a sum of areas of all the small dimples to a surface area of a phantom sphere of the golf ball is less than 2.0%,
a ratio PL of a sum of areas of all the large dimples to the surface area of the phantom sphere of the golf ball is equal to or greater than 79.0%, and
a degree G of uniformity of areas (mm2) of the large dimples is equal to or less than 1.15.

### Claim 2 (depends on 1)

The golf ball according to claim 1, wherein the ratio PS is equal to or greater than 0.7%.

### Claim 3 (depends on 1)

The golf ball according to claim 1, wherein the number NS of the small dimples is equal to or greater than 6 but equal to or less than 20.

### Claim 4 (depends on 1)

The golf ball according to claim 1, wherein a ratio (NS/N) of the number NS of the small dimples to a total number N of the dimples is equal to or greater than 0.01 but equal to or less than 0.07.

### Claim 5 (depends on 1)

The golf ball according to claim 1, wherein each dimple has a depth of a deepest portion from a surface of the phantom sphere of equal to or greater than 0.10 mm but equal to or less than 0.65 mm.

### Claim 6 (depends on 1)

The golf ball according to claim 1, wherein a total volume of the dimples is equal to or greater than 450 mm3 but equal to or less than 750 mm3.

### Claim 7 (depends on 1)

The golf ball according to claim 1, wherein
the ratio PL is equal to or greater than 79.5%, and
the degree G of uniformity is equal to or less than 1.10.

### Claim 8 (depends on 7)

The golf ball according to claim 7, wherein
the ratio PL is equal to or greater than 80.0%, and
the degree G of uniformity is equal to or less than 1.05.

### Claim 9 (depends on 1)

The golf ball according to claim 1 comprising a core, one or more mid layers positioned outside the core, and a cover positioned outside the mid layers, wherein
the cover has a Shore D hardness greater than a Shore D hardness of each of the mid layers, and
an average THm of products obtained by multiplying a thickness (mm) by a hardness (Shore D) for each of the mid layers, and a product THc obtained by multiplying a thickness (mm) by a hardness (Shore D) for the cover satisfy the following mathematical formula:
THc−THm≦50.

### Claim 10 (depends on 9)

The golf ball according to claim 9, wherein the product THm and the product THc satisfy the following mathematical formula:
−50≦THc−THm.

### Claim 11 (depends on 1)

The golf ball according to claim 1 comprising a core, one or more mid layers positioned outside the core, and a cover positioned outside the mid layers, wherein
the cover has a Shore D hardness smaller than a Shore D hardness of each of the mid layers, and
an average THm of products obtained by multiplying a thickness (mm) by a hardness (Shore D) for each of the mid layers, and a product THc obtained by multiplying a thickness (mm) by a hardness (Shore D) for the cover satisfy the following mathematical formula:
−60≦THc−THm.

### Claim 12 (depends on 11)

The golf ball according to claim 11, wherein the product THm and the product THc satisfy the following mathematical formula:
THc−THm≦40.