# US 2023/0054484 A1 · Golf ball

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- Number: US 2023/0054484 A1
- Document ID: US20230054484A1
- Status: Published application
- Kind: A1
- Application number: 17/860,121
- Filed: 2022-07-08
- Published: 2023-02-23
- Earliest claimed: 2021-08-19
- Assignees: Sumitomo Rubber Industries, Ltd.
- Applicants: Sumitomo Rubber Industries, Ltd.
- Inventors: Hidetaka INOUE; Kazuya KAMINO; Mariko HASHINOKUCHI
- Web page: https://patentgrep.com/patent/US20230054484A1

## CPC

- A63B 37/0087: {Deflection or compression}
- A63B 37/00222: {Physical properties, e.g. hardness}
- A63B 37/0033: {Thickness}
- A63B 37/0045: {Thickness}
- A63B 37/0075: {Three piece balls, i.e. cover, intermediate layer and core}
- A63B 37/00922: {whereby hardness of the cover is lower than hardness of the intermediate layers}
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)

## Abstract

A golf ball can include a core, mid layer, and a cover. The golf ball can satisfy the following mathematical formulas (1) and (2), Fw / Fwn ≤ 0.98 Fw / Fwn 2 / Fp / Fpn ≤ 0.98 , wherein Fw represents a maximum vertical force of the golf ball measured under a first condition, Fwn represents a maximum vertical force of a standard ball measured under the first condition, Fp represents a maximum vertical force of the golf ball measured under a second condition, and Fpn represents a maximum vertical force of the standard ball measured under the second condition.

## Claims

### Claim 1

A golf ball comprising a core, a mid layer positioned outside the core, and a cover positioned outside the mid layer, the golf ball satisfying the following mathematical formulas (1) and (2),
(Fw/Fwn) ≤ 0.98 (1),
(Fw/Fwn)2 / (Fp/Fpn) ≤ 0.98 (2),
wherein Fw represents a maximum vertical force of the golf ball measured under a first condition, Fwn represents a maximum vertical force of a standard ball measured under the first condition, Fp represents a maximum vertical force of the golf ball measured under a second condition, and Fpn represents a maximum vertical force of the standard ball measured under the second condition.

### Claim 2 (depends on 1)

The golf ball according to claim 1, wherein the golf ball satisfies the mathematical formula (3),
(Fp/Fpn) ≤ 0.98 (3) .

### Claim 3 (depends on 1)

The golf ball according to claim 1, wherein the golf ball satisfies the mathematical formula (4),
(Tp/Tpn) ≥ 1.01 (4),
wherein Tp represents a contact time of the golf ball measured under the second condition, and Tpn represents a contact time of the standard ball measured under the second condition.

### Claim 4 (depends on 3)

The golf ball according to claim 3, wherein the golf ball satisfies the mathematical formula (5),
(Fp/Fpn) / (Tp/Tpn) ≤ 0.98 (5).

### Claim 5 (depends on 1)

The golf ball according to claim 1, wherein the golf ball satisfies the mathematical formula (6),
(Tw/Twn) ≥ 1.01 (6),
wherein Tw represents a contact time of the golf ball measured under the first condition, and Twn represents a contact time of the standard ball measured under the first condition.

### Claim 6 (depends on 5)

The golf ball according to claim 5, wherein the golf ball satisfies the mathematical formula (7),
(Fw/Fwn) / (Tw/Twn) ≤ 0.98 (7) .

### Claim 7 (depends on 1)

The golf ball according to claim 1, wherein an amount of compressive deformation CD of the golf ball measured under a condition that an initial load is 98 N and a final load is 1275 N is not less than 3.00 mm.

### Claim 8 (depends on 1)

The golf ball according to claim 1, wherein a surface hardness H2s (Shore C) of the mid layer is greater than a surface hardness H1s (Shore C) of the core and is greater than a surface hardness H3s (Shore C) of the cover.

### Claim 9 (depends on 1)

The golf ball according to claim 1, wherein a difference (H1s-H1o) between a surface hardness H1s (Shore C) and a central hardness H1o (Shore C) of the core is not less than 14.

### Claim 10 (depends on 1)

The golf ball according to claim 1, wherein a ratio of a sum (T2+T3) of a thickness T2 of the mid layer and a thickness T3 of the cover to a diameter D1 of the core is not greater than 0.042.

### Claim 11 (depends on 1)

The golf ball according to claim 1, wherein a ratio (H2/H3) of a hardness H2 (Shore D) of the mid layer to a hardness H3 (Shore D) of the cover is not less than 1.80.

### Claim 12 (depends on 1)

The golf ball according to claim 1, further comprising one or more paint layers positioned outside the cover, wherein
an indentation depth of an outermost paint layer when a load is 30 mgf is not less than 300 nm and not greater than 3000 nm.