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:
Aug. 08, 2006
Filed:
Dec. 13, 2002
Junji Hayashi, Chichibu, JP;
Hisashi Yamagishi, Chichibu, JP;
Yasumasa Shimizu, Chichibu, JP;
Yasushi Ichikawa, Chichibu, JP;
Junji Hayashi, Chichibu, JP;
Hisashi Yamagishi, Chichibu, JP;
Yasumasa Shimizu, Chichibu, JP;
Yasushi Ichikawa, Chichibu, JP;
Bridgestone Sports Co., Ltd., Tokyo, JP;
Abstract
A multi-piece golf ball includes a core 30–40 mm in diameter, an intermediate layer including an outermost layer 0.5–2.0 mm thick, and a cover 0.5–2.0 mm thick. The core is a rubber composition mainly containing polybutadiene. The outermost layer is a resin material containing an ionomer resin in an amount of 30% by weight or more. The cover material is obtained by dispersedly blending a silicone powder in a main resin containing an ionomer resin in an amount of 50% by weight or more. The hardness of the outermost layer is harder than the hardness of the core's a center portion. The hardness of the cover is harder than the hardness of the outermost layer. A difference in hardness between the cover and the center portion of the core satisfies a relation of 10≦(Durometer D hardness of cover−Durometer D hardness of center portion of core≦40.