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:
Sep. 23, 2008
Filed:
Apr. 06, 2007
Hiroyuki Takeuchi, Kobe, JP;
Hiroyuki Takeuchi, Kobe, JP;
SRI Sports Limited, Kobe-Shi, Hyogo, JP;
Abstract
Each point obtained by plotting flexural rigidity EI measured at ten sites on a shaft is defined as from T() to T() in this order from the head side, and the formula representing a line K that passes the T() and the T() is [Y=aX+b]. The values at the Y-intercepts on the lines that are parallel to the line K and that pass the points of from T() to T(), respectively, are defined as from bto b, respectively, and the minimum value among the values at the Y-intercept bto bis defined as bmin. In this shaft, slope 'a' of the line K is 0.04 or greater and 0.06 or less; any one of the b, b, b, b, band bis smaller than b; and the bmin is any one of bto b. The value (b−bmin) is 24 (N·m) or greater and 35 (N·m) or less, and the value (b−b) is 0 or greater and 10 (N·m) or less. This shaft achieves excellent flight distance performance and directionality of the hit ball.