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. 11, 2003
Filed:
Jul. 17, 2001
Masaya Tsunoda, Kobe, JP;
Jun Ochi, Kobe, JP;
Kouhei Takemura, Kobe, JP;
Masahide Onuki, Kobe, JP;
Masahiko Ueda, Kobe, JP;
Sumitomo Rubber Industries, Ltd., Kobe, JP;
Abstract
A golf ball ( ) comprises a core ( ) and a cover ( ). The core ( ) has a six-layer structure having first to sixth layers ( ) to ( ). A value of (T /T ) is greater than 2.10 and is equal to or smaller than 2.50, wherein time series data on force in a z direction which is applied to a load cell provided on a back face of a collision plate inclined by 22 degrees with respect to a horizontal direction when the golf ball ( ) impacts the collision plate at a speed of 35 m/s in a vertically upward direction are represented by Fn(t), time series data on force in an x direction are represented by Ft(t), a time taken after a start of the impact before the Fn(t) is first changed from a positive number to zero is represented by T and a time taken after the start of the impact before the Ft(t) is first changed from a positive number to a negative number is represented by T . The golf ball ( ) has a higher back spin rate during hitting on the same conditions than that of a conventional golf ball.