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:
Jul. 30, 2002
Filed:
Dec. 15, 1999
Kazunori Misono, Osaka, JP;
Masaaki Okuyama, Osaka, JP;
Toshiaki Kida, Osaka, JP;
Kazuya Ishida, Osaka, JP;
Mizuno Corporation, Osaka, JP;
Abstract
A baseball or softball bat capable of increasing the hit distance of a ball and reducing the manufacturing cost can be obtained. A baseball or softball bat ( ) including a hitting portion ( ), a taper portion ( ), and a grip portion ( ) has a tubular member ( ) which includes an outer circumference plane ( ) extending from the hitting portion ( ) to the grip portion ( ) and an inner circumference plane ( ) located inside the outer circumference plane ( ) and extending from the hitting portion ( ) to the grip portion ( ), and a metal tubular member ( ) which is placed between the outer circumference plane ( ) and the inner circumference plane ( ) at least in the hitting portion ( ), the metal tubular member ( ) having a weak boundary layer ( ) formed on its surface.