Racket frame
US8651985B2 · kind B2 · utility
4Cited by
6References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 20, 2012 |
| Grant date | Feb 18, 2014 |
| Priority date | — |
| Expiry date | Aug 20, 2032 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B2225/02
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A racket frame 2 includes a head 4, a shaft 8, and a pair of throats 6 extending from the head 4 to the shaft 8. A flexural rigidity G15 of the throats 6 in a low load range (from 5 kgf to 15 kgf) is equal to or greater than 600 kgf/mm but equal to or less than 900 kgf/mm. A flexural rigidity G55 of the throats 6 in a high load range (from 45 kgf to 55 kgf) is equal to or greater than 900 kgf/mm but equal to or less than 1200 kgf/mm. A rigidity ratio (G15/G55) of the flexural rigidity G15 and the flexural rigidity G55 is equal to or greater than 0.70 but equal to or less than 0.85.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.