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:
May. 15, 2007
Filed:
Oct. 19, 2004
Hiroyuki Takeuchi, Hyogo, JP;
Takeshi Ashino, Hyogo, JP;
Hiroyuki Takeuchi, Hyogo, JP;
Takeshi Ashino, Hyogo, JP;
SRI Sports Limited, Kobe, JP;
Abstract
A tennis racket having a racket frame defining a ball-hitting face, wherein if the upper part of the ball-hitting face is set as a 0-degree position, a string protection member is mounted on at least one portion of a head part of the racket frame in a range from a clockwise 45-degree position to a clockwise 135-degree position and in a range from a clockwise 225-degree position to a clockwise 315-degree position by interposing a viscoelastic member between the string protection member and the racket frame. The moment (Is) of inertia of the tennis racket in a swing direction is set to not less than 450,000 g/cmnor more than 490,000 g/cm, when strings are not tensionally mounted thereon. The moment (Ic) of inertia of the tennis racket in a center direction is set to not less than 15,000 g/cmnor more than 19,000 g/cm, when the strings are not tensionally mounted thereon.