# US 5,702,312 A · Solid golf ball

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- Number: US 5,702,312 A
- Document ID: US5702312A
- Status: Granted
- Kind: A
- Application number: 08/713,656
- Filed: 1996-09-13
- Granted: 1997-12-30
- Earliest claimed: 1995-09-14
- Assignees: Sumitomo Rubber Industries, Ltd.
- Inventors: Kuniyasu Horiuchi; Seiichiro Endo; Keiji Moriyama; Masatoshi Yokota
- Web page: https://patentgrep.com/patent/US5702312A

## CPC

- A63B 37/0004: {Surface depressions or protrusions}
- A63B 37/0017: {Specified total dimple volume}
- A63B 37/0019: {Specified dimple depth}
- A63B 37/002: {Specified dimple diameter}
- A63B 37/0021: {Occupation ratio, i.e. percentage surface occupied by dimples}
- A63B 37/0031: {Hardness}
- A63B 37/0033: {Thickness}
- A63B 37/0037: {Flexural modulus; Bending stiffness}
- A63B 37/0064: {Diameter}
- A63B 37/0074: {Two piece balls, i.e. cover and core}
- A63B 37/0096: {Spin rate}
- A63B 37/0094: {Rebound resilience}
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)

## Abstract

A solid golf ball having good controllability and long flight distance and having a solid core, a cover covering the core and dimples formed on the surface of the cover, wherein the cover has a Shore D hardness of 52 to 64 and the dimples satisfy the following equation: (Dimple area proportion (%)).times.(Total dimple volume (mm.sup.3)).div.100=220 to 270.

## Claims

### Claim 1

A solid golf ball comprising a solid core, a cover covering said core and dimples formed on the surface of the cover, wherein said cover has a Shore D hardness of 52 to 64 and said dimples satisfy the following equation:
(Dimple area proportion (%)).times.(Total dimple volume (mm.sup.3)).div.100=220 to 270,
wherein the dimple area proportion is within the range of 70 to 88% and the total dimple volume is within the range of 260 to 360 mm.sup.3.

### Claim 2 (depends on 1)

The solid golf ball according to claim 1, wherein the cover has a thickness of 1.40 to 2.30 mm and a flexural modulus of 1,000 to 2,500 Kgf/cm.sup.2.

### Claim 3 (depends on 1)

The solid golf ball according to claim 1, wherein the core has a deformation amount of from 10 Kg to 130 Kg being within the range of 2.50 to 3.50 mm.

### Claim 4 (depends on 1)

The solid golf ball according to claim 1, wherein the cover has a flexural modulus of 1,000 to 2,500 Kgf/cm.sup.2.