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. 08, 2022
Filed:
Jun. 29, 2018
Sumitomo Rubber Industries, Ltd., Hyogo, JP;
Takehiko Hyodo, Kobe, JP;
Masanori Taguchi, Kobe, JP;
Kazuyoshi Shiga, Kobe, JP;
Hiroaki Tanaka, Kobe, JP;
Kunio Niwa, Kobe, JP;
Fumiya Suzuki, Kobe, JP;
Sumitomo Rubber Industries, Ltd., Hyogo, JP;
Abstract
A rubber composition for a tennis ball includes a base rubber and a filler having a degree of flatness DL of not less than 50, the degree of flatness DL being obtained by dividing an average particle diameter D(μm) of the filler by an average thickness T (μm) of the filler. An amount of the filler per 100 parts by weight of the base rubber is not less than 1 part by weight and not greater than 150 parts by weight. A gas permeability coefficient GPS and a loss tangent tan δS of the rubber composition and a gas permeability coefficient GPL and a loss tangent tan δL of a rubber composition obtained by replacing the filler with kaolin clay having a degree of flatness DL of 20 satisfy (1): GPL/GPS≥1.02 and (2): |tan δL−tan δS|≤0.03. A tennis ballincludes a coreformed using the rubber composition.