The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 22, 2013
Filed:
Jun. 29, 2012
Yosuke Yamamoto, Kobe, JP;
Kuniyasu Horiuchi, Kobe, JP;
Yosuke Yamamoto, Kobe, JP;
Kuniyasu Horiuchi, Kobe, JP;
Dunlop Sports Co. Ltd., Kobe, JP;
Abstract
A racket frameincludes a bodyand a first vibration-damping portionfixed to the body. The bodyincludes a head, a shaft, a pair of throatsextending from the headto the shaft, and a gripconnected to the shaft. The bodyincludes a second vibration-damping portion, and the material of the second vibration-damping portionis different from the material of the first vibration-damping portion. The ratio (R/R) of a side pressure rigidity Rto a throat rigidity Ris 0.26 or greater, a moment of inertia around an axis at a position of 10 cm from a grip end is less than 300 kg·cm, and a vibration damping rate in an out-of-plane secondary mode is equal to or greater than 0.70 but equal to or less than 1.0.