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:
Sep. 30, 2003
Filed:
Dec. 06, 2000
Sumitomo Rubber Industries, Ltd., Kobe, JP;
Abstract
The present invention provides a multi-piece solid golf ball having excellent rebound characteristics when hitting at low head speed because the rebound characteristics do not depend on the head speed at the time of hitting. The present invention relates to a multi-piece solid golf ball comprising core composed of inner core , middle core , and outer core and at least one layer of cover , wherein the above-mentioned inner core has a JIS-C hardness of 63 to 83, the above-mentioned outer core has a JIS-C hardness of 63 to 83, the JIS-C hardness of the above-mentioned inner core is greater than the JIS-C hardness of the above-mentioned middle core by 4 to 40, the JIS-C hardness of the above-mentioned outer core is greater than the JIS-C hardness of the above-mentioned middle core by only 4 to 40, each of the above-mentioned core layers are composed of a vulcanized molded article of a rubber composition containing base rubber, co-crosslinking agent, organic peroxide, and when necessary organic sulfide compound, and the two formulas, 0≦H /H <1 and 0≦H /H <1 are satisfied when the amounts of organic sulfide that is added to each of the above-mentioned core layers are H , H , and H , respectively, in terms of parts by weight.