Multi-piece golf ball
US9498683B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 25, 2014 |
| Grant date | Nov 22, 2016 |
| Priority date | — |
| Expiry date | Feb 10, 2035 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B45/00
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
Provided is a golf ball showing a low spin rate on driver shots and a high spin rate on approach shots. Also provided is a multi-piece golf ball comprising a center and n (n is a natural number of 3 or more) envelope layers covering the center, wherein material hardness of the envelope layers satisfies H1<H0<Hn−1; where the envelope layers formed in order from the center side are referred to as the first envelope layer, the second envelope layer, the third envelope layer, the fourth envelope layer, . . . the n−1th envelope layer and the nth envelope layer (the outmost layer), respectively and H0 is a material hardness (Shore D hardness) of the center, and H1, H2, H3, H4, . . . Hn−1 and Hn are material hardness (Shore D hardness) of the first envelope layer, the second envelope layer, the third envelope layer, the fourth envelope layer, . . . the n−1th envelope layer and the nth envelope layer (the outmost layer), respectively; and the center is formed from a thermoplastic resin composition, and the first envelope layer is formed from a thermoplastic resin composition or a rubber composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.