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. 26, 2019
Filed:
Jul. 29, 2016
Dunlop Sports Co. Ltd., Kobe-shi, Hyogo, JP;
Hikaru Nagakura, Kobe, JP;
Kazuyoshi Shiga, Kobe, JP;
Ryota Sakamine, Kobe, JP;
Takahiro Shigemitsu, Kobe, JP;
SUMITOMO RUBBER INDUSTRIES, LTD., Kobe-Shi, Hyogo, JP;
Abstract
An object of the present invention is to provide a golf ball having an excellent initial velocity when being hit at a head speed of 50 m/sec and an improved initial velocity when being hit at a head speed of 40 m/sec. The present invention provides a golf ball comprising a spherical core and a cover covering the spherical core, wherein the golf ball has a rebound equivalence energy ratio (R) ranging from 65.50% to 99.0% at a deformation amount of 7%, and a rebound equivalence energy ratio (R) ranging from 20.0% to 70.0% at a deformation amount of 19%, in a compression test (measurement temperature: −70° C., compression speed: 30 mm/min) applying a load to the golf ball along a radial direction of the golf ball.