Patents by Inventor Mikio Yamada
Mikio Yamada has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10265585Abstract: An object of the present invention is to provide a golf ball excellent in flying performance, in particular, to provide a golf ball traveling a great flight distance. The present invention provides a golf ball having a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a rubber composition containing (a) a base rubber, (b) an ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, and (d1) an aromatic carboxylic acid or (d2) an aromatic carboxylic acid salt, provided that the rubber composition further contains (e) a metal compound in the case of containing only (b) the ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms as the co-crosslinking agent.Type: GrantFiled: October 17, 2016Date of Patent: April 23, 2019Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Chiemi Mikura, Kazuhisa Fushihara, Mikio Yamada, Shun Kurihara, Ayaka Shindo
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Patent number: 9694243Abstract: An object of the present invention is to provide a golf ball showing a low spin rate on driver shots and an excellent shot feeing. The present invention provides a golf ball having a spherical core and at least one cover covering the spherical core, wherein the spherical core is formed from a rubber composition containing: (a) a base rubber, (b) an ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, and at least one compound of (d) mercaptobenzoic acids and/or salts thereof, provided that the rubber composition further contains (e) a metal compound in the case of containing only (b) the ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms as the co-crosslinking agent, and the spherical core has a hardness difference (Hs?Ho) between a surface hardness (Hs) and a center hardness (Ho) thereof of 20 or more in JIS-C hardness.Type: GrantFiled: August 29, 2014Date of Patent: July 4, 2017Assignee: DUNLOP SPORTS CO. LTD.Inventors: Chiemi Mikura, Ayaka Shindo, Mikio Yamada
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Patent number: 9566476Abstract: An object of the present invention is to provide a golf ball excellent in flying performance, in particular, to provide a golf ball traveling a great flight distance. The present invention provides a golf ball having a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a rubber composition containing (a) a base rubber, (b) an ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, and (d) a carboxylic acid, provided that the rubber composition further contains (e) a metal compound in the case of containing only (b) the ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms as the co-crosslinking agent.Type: GrantFiled: December 2, 2011Date of Patent: February 14, 2017Assignee: DUNLOP SPORTS CO. LTD.Inventors: Chiemi Mikura, Kazuhisa Fushihara, Mikio Yamada, Shun Kurihara, Ayaka Shindo
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Publication number: 20170036068Abstract: An object of the present invention is to provide a golf ball excellent in flying performance, in particular, to provide a golf ball traveling a great flight distance. The present invention provides a golf ball having a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a rubber composition containing (a) a base rubber, (b) an ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, and (d1) an aromatic carboxylic acid or (d2) an aromatic carboxylic acid salt, provided that the rubber composition further contains (e) a metal compound in the case of containing only (b) the ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms as the co-crosslinking agent.Type: ApplicationFiled: October 17, 2016Publication date: February 9, 2017Applicant: Dunlop Sports Co., Ltd.Inventors: Chiemi MIKURA, Kazuhisa FUSHIHARA, Mikio YAMADA, Shun KURIHARA, Ayaka SHINDO
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Patent number: 9486673Abstract: An object of the present invention is to provide a golf ball having a low spin rate on driver shots and excellent in flight distance performance. The present invention provides a golf ball having a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a rubber composition containing (a) a base rubber, (b) an ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, and (d) a salt of a carboxylic acid, provided that the rubber composition further contains (e) a metal compound in the case of containing only (b) the ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms as the co-crosslinking agent.Type: GrantFiled: December 27, 2011Date of Patent: November 8, 2016Assignee: DUNLOP SPORTS CO. LTD.Inventors: Chiemi Mikura, Kazuhisa Fushihara, Mikio Yamada, Shun Kurihara, Ayaka Shindo
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Patent number: 9409058Abstract: An object of the present invention is to provide a golf ball having a great flight distance on driver shots. The present invention provides a golf ball having a spherical core and at least one cover layer covering the spherical core, wherein when JIS-C hardness, which is measured at nine points obtained by dividing a radius of the spherical core into equal parts having 12.5% intervals therebetween, is plotted against distance (%) from a core center, the spherical core is such that R2 of a linear approximation curve obtained from the least square method is 0.95 or higher, and a hardness difference between a core surface hardness and a core central hardness is 15 or higher in JIS-C hardness.Type: GrantFiled: December 28, 2011Date of Patent: August 9, 2016Assignee: DUNLOP SPORTS CO. LTD.Inventors: Chiemi Mikura, Kazuhisa Fushihara, Mikio Yamada
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Patent number: 9364720Abstract: An object of the present invention is to provide a golf ball traveling a great distance of a driver shot. The present invention provides a golf ball having a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a rubber composition containing (a) a base rubber, (b) an ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, (d) a carboxylic acid and/or a salt thereof, and (e) an organic sulfur compound having a naphthalene ring, provided that the rubber composition further contains (e) a metal compound in the case of containing only (b) the ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms as the co-crosslinking agent.Type: GrantFiled: December 28, 2011Date of Patent: June 14, 2016Assignee: DUNLOP SPORTS CO. LTD.Inventors: Chiemi Mikura, Kazuhisa Fushihara, Mikio Yamada
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Publication number: 20150065270Abstract: An object of the present invention is to provide a golf ball showing a low spin rate on driver shots and an excellent shot feeing. The present invention provides a golf ball having a spherical core and at least one cover covering the spherical core, wherein the spherical core is formed from a rubber composition containing: (a) a base rubber, (b) an ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, and at least one compound of (d) mercaptobenzoic acids and/or salts thereof, provided that the rubber composition further contains (e) a metal compound in the case of containing only (b) the ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms as the co-crosslinking agent, and the spherical core has a hardness difference (Hs—Ho) between a surface hardness (Hs) and a center hardness (Ho) thereof of 20 or more in JIS-C hardness.Type: ApplicationFiled: August 29, 2014Publication date: March 5, 2015Inventors: Chiemi MIKURA, Ayaka SHINDO, Mikio YAMADA
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Patent number: 8907020Abstract: An object of the present invention is to provide a golf ball having high resilience. The present invention provides a golf ball having a constituting member, wherein at least a part of the constituting member is formed from a rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, and (d) an organic sulfur compound, the organic sulfur compound being derivatives of thiophenols and disulfide with a strong electron withdrawing substituent.Type: GrantFiled: November 23, 2011Date of Patent: December 9, 2014Assignee: SRI Sports LimitedInventors: Hiromasa Tsunashima, Yumi Kanemitsu, Kazuhisa Fushihara, Mikio Yamada
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Patent number: 8877869Abstract: An object of the present invention is to provide a golf ball having high resilience. The gist of the present invention resides in selecting an organic sulfur compound used for a golf ball rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, and (d) the organic sulfur compound from organic sulfur compounds having specific structures such that a sum of substituent constants of the substituents X in a structure represented by the following formula (4) is 0.2 or more and SP value of the structure represented by the following formula (4) is in a range from 19.0 (J/cm3)1/2 to 24.0 (J/cm3)1/2 and using the same.Type: GrantFiled: October 20, 2011Date of Patent: November 4, 2014Assignee: SRI Sports LimitedInventors: Ayaka Hibi, Chiemi Mikura, Kazuhisa Fushihara, Yumi Kanemitsu, Mikio Yamada
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Patent number: 8592526Abstract: An object of the present invention is to provide an environmentally safe golf ball having excellent resilience. The present invention provides a golf ball having constituting members, wherein at least a part of the constituting members is formed from a rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, and (d) an organic sulfur compound, wherein the organic sulfur compound includes a disubstituted compound of thiophenol, disulfide and/or thiophenol metal salt with Br, F or CF3 only at ortho positions.Type: GrantFiled: October 18, 2010Date of Patent: November 26, 2013Assignee: SRI Sports LimitedInventors: Kazuhisa Fushihara, Yumi Kanemitsu, Mikio Yamada
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Patent number: 8372940Abstract: An object of the present invention is to improve the abrasion resistance of a golf ball that uses a polyurethane as a resin component for a cover. Another object of the present invention is to improve the shot feeling of a golf ball that uses a polyurethane as a resin component for a cover. The present invention provides a golf ball comprising a core; and a cover covering the core, wherein the cover contains a polyurethane elastomer as a resin component, and the polyurethane elastomer contains a polyol component and a polyisocyanate component and does not contain a chain extender.Type: GrantFiled: June 23, 2010Date of Patent: February 12, 2013Assignees: Sumitomo Rubber Industries Limited, SRI Sports LimitedInventors: Mutsuhisa Furukawa, Ryo Mashita, Kazuyoshi Shiga, Takashi Sasaki, Mikio Yamada
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Publication number: 20120172151Abstract: An object of the present invention is to provide a golf ball traveling a great distance of a driver shot. The present invention provides a golf ball having a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a rubber composition containing (a) a base rubber, (b) an ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, (d) a carboxylic acid and/or a salt thereof, and (e) an organic sulfur compound having a naphthalene ring, provided that the rubber composition further contains (e) a metal compound in the case of containing only (b) the ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms as the co-crosslinking agent.Type: ApplicationFiled: December 28, 2011Publication date: July 5, 2012Applicant: SRI SPORTS LIMITEDInventors: Chiemi MIKURA, Kazuhisa FUSHIHARA, Mikio YAMADA
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Publication number: 20120172150Abstract: An object of the present invention is to provide a golf ball having a great flight distance on driver shots. The present invention provides a golf ball having a spherical core and at least one cover layer covering the spherical core, wherein when JIS-C hardness, which is measured at nine points obtained by dividing a radius of the spherical core into equal parts having 12.5% intervals therebetween, is plotted against distance (%) from a core center, the spherical core is such that R2 of a linear approximation curve obtained from the least square method is 0.95 or higher, and a hardness difference between a core surface hardness and a core central hardness is 15 or higher in JIS-C hardness.Type: ApplicationFiled: December 28, 2011Publication date: July 5, 2012Applicant: SRI SPORTS LIMITEDInventors: Chiemi MIKURA, Kazuhisa FUSHIHARA, Mikio YAMADA
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Publication number: 20120172149Abstract: An object of the present invention is to provide a golf ball having a low spin rate on driver shots and excellent in flight distance performance. The present invention provides a golf ball having a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a rubber composition containing (a) a base rubber, (b) an ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, and (d) a salt of a carboxylic acid, provided that the rubber composition further contains (e) a metal compound in the case of containing only (b) the ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms as the co-crosslinking agent.Type: ApplicationFiled: December 27, 2011Publication date: July 5, 2012Applicant: SRI SPORTS LIMITEDInventors: Chiemi MIKURA, Kazuhisa FUSHIHARA, Mikio YAMADA, Shun KURIHARA, Ayaka SHINDO
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Publication number: 20120149496Abstract: An object of the present invention is to provide a golf ball having high resilience. The present invention provides a golf ball having a constituting member, wherein at least a part of the constituting member is formed from a rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, and (d) an organic sulfur compound, the organic sulfur compound being derivatives of thiophenols and disulfide with a strong electron withdrawing substituent.Type: ApplicationFiled: November 23, 2011Publication date: June 14, 2012Inventors: Hiromasa Tsunashima, Yumi Kanemitsu, Kazuhisa Fushihara, Mikio Yamada
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Publication number: 20120142453Abstract: An object of the present invention is to provide a golf ball excellent in flying performance, in particular, to provide a golf ball traveling a great flight distance. The present invention provides a golf ball having a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a rubber composition containing (a) a base rubber, (b) an ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, and (d) a carboxylic acid, provided that the rubber composition further contains (e) a metal compound in the case of containing only (b) the ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms as the co-crosslinking agent.Type: ApplicationFiled: December 2, 2011Publication date: June 7, 2012Applicant: SRI SPORTS LIMITEDInventors: Chiemi MIKURA, Kazuhisa FUSHIHARA, Mikio YAMADA, Shun KURIHARA, Ayaka SHINDO
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Publication number: 20120135823Abstract: An object of the present invention is to provide a golf ball having high resilience. The gist of the present invention resides in selecting an organic sulfur compound used for a golf ball rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, and (d) the organic sulfur compound from organic sulfur compounds having specific structures such that a sum of substituent constants of the substituents X in a structure represented by the following formula (4) is 0.2 or more and SP value of the structure represented by the following formula (4) is in a range from 19.0 (J/cm3) using the same.Type: ApplicationFiled: October 20, 2011Publication date: May 31, 2012Inventors: Ayaka HIBI, Chiemi Mikura, Kazuhisa Fushihara, Yumi Kanemitsu, Mikio Yamada
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Patent number: 8138298Abstract: The object of the present invention is to provide a golf ball having excellent scuff resistance and spin performance. The present invention provides a golf ball which comprises a core and a cover covering the core. The cover contains a polyurethane as a resin component, and the polyurethane is obtained by employing a multimodal polyol having multimodality in molecular weight distribution, as a high-molecular-weight polyol component constituting the polyurethane.Type: GrantFiled: May 22, 2009Date of Patent: March 20, 2012Assignee: SRI Sports LimitedInventors: Kazuyoshi Shiga, Takashi Sasaki, Mikio Yamada
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Patent number: 8044164Abstract: A golf ball which has excellent abrasion-resistance and spin performance is provided. The golf ball of the present invention includes a core and a cover covering the core. The cover contains, as a resin component, polyurethane which is obtained using, as a polyisocyanate component constituting the polyurethane, 4,4?-dicyclohexylmethane diisocyanate having a mole ratio ((B)/(A)) of non-cis-structure molecule (B) to cis-structure molecule (A) in a range from 3/7 to 9/1.Type: GrantFiled: November 26, 2008Date of Patent: October 25, 2011Assignee: SRI Sports LimitedInventors: Kazuyoshi Shiga, Takashi Sasaki, Mikio Yamada