Two-piece golf ball
US5607366A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1995 |
| Grant date | Mar 4, 1997 |
| Priority date | — |
| Expiry date | Apr 21, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S273/22
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A two-piece golf ball, comprising: PA1 a core having a surface hardness of 55 to 75 and a sectional hardness at the location other than the core surface layer of 65 to 88, said hardness value being determined by a JIS-C type hardness tester; and PA1 a cover covering said core and having a stiffness of 1,000 to 3,000 kg/cm.sup.2 ; PA1 wherein said golf ball exhibits a contact area S between itself and a clubface, when hit with a driver at a head speed of 40 m/second, of 4.3 to 5.0 cm.sup.2, S being determined by the equation: EQU S=.pi.(1/2{(a+b)/2}).sup.2 wherein a is a transverse diameter of the contact area and b is a longitudinal diameter of the contact area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.