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:
Nov. 22, 2016
Filed:
Jul. 30, 2014
Applicant:
Dunlop Sports Co. Ltd., Kobe-shi, Hyogo, JP;
Inventor:
Hirotaka Nakamura, Kobe, JP;
Assignee:
DUNLOP SPORTS CO. LTD., Kobe-shi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A63B 53/10 (2015.01);
U.S. Cl.
CPC ...
A63B 53/10 (2013.01); A63B 60/42 (2015.10); A63B 2209/02 (2013.01); A63B 2209/023 (2013.01);
Abstract
A shaftis formed by a plurality of prepreg sheets s, s, s, s, s, s, s, sand s. These prepreg sheets include full length sheets and partial sheets partially provided in the axial direction of the shaft. The full length sheets include a full length hoop sheet s. The partial sheets include glass fiber reinforced sheets s, s. In the shaft, a volume ratio Vf of the hoop layer in a specific tip part Tx is equal to or greater than 2.5% and less than 10%. The shaftis lightweight and has a high degree of design freedom of a position of a center of gravity. The shaftis excellent in strength of a tip part.