# US 2017/0254667 A1 · Multi-layer core golf ball

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- Number: US 2017/0254667 A1
- Document ID: US20170254667A1
- Status: Published application
- Kind: A1
- Application number: 15/603,712
- Filed: 2017-05-24
- Published: 2017-09-07
- Earliest claimed: 2008-01-10
- Assignees: Acushnet Company
- Applicants: Acushnet Company
- Inventors: Michael J. Sullivan; Derek A. Ladd
- Web page: https://patentgrep.com/patent/US20170254667A1

## CPC

- G01D 5/14: influencing the magnitude of a current or voltage
- G01D 5/147: {influenced by the movement of a third element, the position of Hall device and the source of magnetic field being fixed in respect to each other}
- G01D 5/16: by varying resistance
- G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR

## Abstract

Golf balls comprising a multi-layer core and a cover are disclosed. The multi-layer core comprises at least three layers, including at least one thermoset layer and at least one thermoplastic layer. The innermost core layer is relatively small, having a diameter of from 0.50 inches to 1.30 inches, and has a plurality of projections disposed thereon.

## Claims

### Claim 1

A golf ball comprising:
an inner core layer formed from a first thermoplastic composition and having a diameter of from 0.50 inches to 1.30 inches and a surface hardness of from 50 to 80 Shore C;
an intermediate core layer formed from a first thermoset composition and having a surface hardness of from 45 Shore D to 65 Shore D;
an outer core layer formed from a second thermoplastic composition and having a surface hardness of 80 Shore C or greater; and
a cover;
wherein the inner core layer comprises a plurality of projections disposed thereon; and
wherein the inner core layer, the intermediate core layer, and the outer core layer each have a specific gravity of from 0.90 g/cc to 1.18 g/cc.

### Claim 2 (depends on 1)

The golf ball of claim 1, wherein the projections disposed on the inner core layer have a truncated pyramidal shape.

### Claim 3 (depends on 1)

The golf ball of claim 1, wherein the golf ball consists essentially of the inner core layer, the intermediate core layer, the outer core layer, and the cover, and wherein the cover is a single layer.

### Claim 4 (depends on 3)

The golf ball of claim 3, wherein the cover is formed from a third thermoplastic composition.