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:
Feb. 18, 2014
Filed:
Aug. 20, 2012
Applicant:
Yosuke Yamamoto, Kobe, JP;
Inventor:
Yosuke Yamamoto, Kobe, JP;
Assignee:
Dunlop Sports Co. Ltd., Kobe-Shi, Hyogo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A63B 49/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A racket frameincludes a head, a shaft, and a pair of throatsextending from the headto the shaft. A flexural rigidity Gof the throatsin 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 Gof the throatsin 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 (G/G) of the flexural rigidity Gand the flexural rigidity Gis equal to or greater than 0.70 but equal to or less than 0.85.