Golf balls
US5836834A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1997 |
| Grant date | Nov 17, 1998 |
| Priority date | — |
| Expiry date | Apr 24, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B37/0003
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A two or three piece golf ball in which a boundary surface between concentric solid layers has a projection formed on the surface of a concentric solid layer having a high hardness such that the projection extends along an approximate normal direction, a depression corresponding to the projection is formed in the surface of a concentric solid layer having a low hardness, and the concentric solid layer having a high hardness and the concentric solid layer having a low hardness are joined together such that the projection is inserted into the depression. A golf ball comprising a two-layer solid core is composed of a low-hardness inner core and a high-hardness outer core joined around the low-hardness inner core. A projection is formed on the inner surface of the high-hardness outer core such that the projection extends along an approximate normal direction, while a depression corresponding to the projection is formed in the outer surface of the low-hardness inner core, and the low-hardness inner core and the high-hardness outer core are joined together such that the projection is inserted into the depression.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.