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:
Oct. 24, 2017
Filed:
Apr. 01, 2016
Dunlop Sports Co. Ltd., Kobe, Hyogo, JP;
Hirotaka Nakamura, Kobe, JP;
Tatsuya Yashiki, Kobe, JP;
DUNLOP SPORTS CO. LTD., Kobe-Shi, Hyogo, JP;
Abstract
A golf clubincludes a head, a shaftand a grip. The shaftincludes a plurality of layers, a tip end Tp and a butt end Bt. If a distance between a center of gravity of the shaft and the butt end Bt is defined as Lg (mm), a shaft full length is defined as Ls (mm), and a ratio of the distance Lg to the shaft full length Ls is defined as a ratio of the center of gravity of the shaft, the ratio of the center of gravity of the shaft is 44.5% or less. If a torsional rigidity at a point of 90 mm distant from the tip end Tp is defined as GJt (kgf·m), and a torsional rigidity at a point of 210 mm distant from the butt end Bt is defined as GJb (kgf·m), GJb/GJt is 5.5 or less.