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. 30, 2014
Filed:
Nov. 29, 2012
Bridgestone Sports Co., Ltd, Tokyo, JP;
Fumiaki Sato, Chichibu, JP;
Bridgestone Sports Co., Ltd, Tokyo, JP;
Abstract
A golf club shaft has the bending rigidity distribution and the torsional rigidity distribution satisfying the following three relational formulas: 1) S/S≧2.5, wherein an average inclination of the bending rigidity in an interval from 400 mm to 700 mm from the front end of the shaft is defined as Sand an average inclination of the bending rigidity in an interval from 800 mm to 950 mm from the front end of the shaft is defined as S; 2) 1.0<EI/GI(mid)<1.5, wherein an average of the ratio of the bending rigidity with respect to the torsional rigidity in an interval from 300 mm to 700 mm from the front end of the shaft is defined as EI/GI(mid); and 3) EI/GI(900)≧1.75, wherein the ratio of the bending rigidity with respect to the torsional rigidity at a position 900 mm from the front end of the shaft is defined as EI/GI(900).