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. 10, 2004
Filed:
Jul. 03, 2002
Sumitomo Rubber Industries, Ltd., Kobe, JP;
Abstract
A racket frame ( ) has a pipe-shaped racket-frame body ( ) made of a fiber reinforced resin and composed of a head ( ), a throat part ( ), a shaft part ( ), and a grip part ( ) sequentially arranged and a yoke ( ) connected to the racket-frame body ( ). In this construction, supposing that the head ( ) is a clock face and that the top position of the head ( ) is 12 o'clock, a yoke rigidity value at a central position P , vertical to a ball-hitting face (F), of the yoke ( ) in a longitudinal direction thereof is in a range of 10% to 70% of a face rigidity value which is an average of a rigidity value at a 12 o'clock position (P ) vertical to the ball-hitting face (F) and a rigidity value at a three o'clock position (P ) vertical to the ball-hitting face (F).