Golf club
US5190289A · kind A · utility
194Cited by
24References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 14, 1991 |
| Grant date | Mar 2, 1993 |
| Priority date | — |
| Expiry date | Mar 14, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B2225/01
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A golf club is composed of a head, a shaft, a grip and the like, and includes a roughened surface portion capable of reducing the value of air resistance by forming a turbulent boundary layer around the head when a golfer swings. The golf club, the roughened surface portion is annularly formed in a peripheral portion of the face portion of the head a neck portion and a socket portion of the head and/or at least a portion of the shaft adjacent to the head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.