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:
Nov. 21, 2006
Filed:
May. 24, 2005
Applicants:
Takeshi Ashino, Hyogo, JP;
Kunio Niwa, Hyogo, JP;
Inventors:
Takeshi Ashino, Hyogo, JP;
Kunio Niwa, Hyogo, JP;
Assignee:
SRI Sports Limited, Kobe, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A63B 49/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a tennis racket having a racket frame composed of a fiber reinforced resin, the moment of inertia Ic of the tennis racket in a center direction thereof is set to not less than 13000 g·cmnor more than 17000 g·cm, the moment of inertia Ig around a center of gravity thereof is set to not less than 80000 g·cmnor more than 200000 g·cm, and the moments of inertia Ic and Ig are so set as to satisfy a relationship expressed by [30×(Ic)−(Ig)]/10000≧31.