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. 24, 2004
Filed:
Nov. 20, 2000
Applicant:
Inventor:
Toshio Chikaraishi, Tokyo, JP;
Assignee:
Bridgestone Sports Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A63B 5/304 ;
U.S. Cl.
CPC ...
A63B 5/304 ;
Abstract
In a wood club head having a hollow metal shell structure with a double face constituted by a front face and a rear face which is disposed behind the front face through an air gap of predetermined width, there is provided a characteristic that when a golf ball is made to collide with the front face at an entrance speed (head speed) V (m/s), the restitution coefficient of the face is in a range of from 0.84 to 0.88 when the entrance speed V is in a range of from 35 to 40 (m/s), and not lower than 0.80 and lower than 0.83 when the entrance speed V is in a range of from 48 to 53 (m/s).