Tennis rackets
US5893810A · kind A · utility
1Cited by
11References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 9, 1996 |
| Grant date | Apr 13, 1999 |
| Priority date | — |
| Expiry date | Aug 9, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B2209/023
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A tennis racket having a striking surface and a handle in combination has a strung total weight of less than 245 g, an overall length larger than 70 cm, a free-free vibrational frequency in the first mode of more than 210 Hz, a center of gravity of more than 41 cm, and a dynamic center of gravity of more than 50 cm, measured from the handle end.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.