Golf ball
US9931542B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 2017 |
| Grant date | Apr 3, 2018 |
| Priority date | — |
| Expiry date | Jul 10, 2037 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B37/00222
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A golf ball 2 includes a main body 4 and a paint film 6. The paint film 6 includes an inner layer 14 and an outer layer 16. A modulus Min of the inner layer 14 is higher than a modulus Mout of the outer layer 16. A difference (Min−Mout) is not less than 25 kgf/cm2. The golf ball 2 has a plurality of dimples 18. A ratio So of a sum of areas of the dimples 18 relative to a surface area of a phantom sphere of the golf ball 2 and a ratio Rs of a number of the dimples 18 each having a diameter of not less than 9.60% and not greater than 10.37% of a diameter of the golf ball 2, relative to a total number of the dimples 18, satisfy the following mathematical formula (1).Rs≥−2.5*So+273 (1)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.