Patents by Inventor Kae Iizuka
Kae Iizuka 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: 10953286Abstract: A golf ball for amateur golfers exhibits excellent flight characteristics when hit by the average golfer and also has a good feel at impact that is both soft and solid. The golf ball includes a core, an intermediate layer and a cover, and has coefficient of restitution and compressive deformation relationships that satisfy specific conditions.Type: GrantFiled: December 20, 2019Date of Patent: March 23, 2021Assignee: Bridgestone Sports Co., Ltd.Inventors: Katsunori Sato, Kae Iizuka
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Patent number: 10786707Abstract: A matte golf ball which is free of luster and gloss has such a good ball appearance that the injection marks which form during injection molding of the cover are not visible. The golf ball includes a core of at least one layer, a cover of at least one layer, and a paint film. The outermost layer of the cover is formed of a resin composition which includes a thermoplastic resin and a colorant comprising a fluorescent dye or a fluorescent pigment, and has a visible light transmittance with an average value at wavelengths in the 380 to 780 nm spectrum of from 2.0 to 50.0%. The paint film is formed of a urethane-based paint composition containing delustering particles.Type: GrantFiled: April 24, 2019Date of Patent: September 29, 2020Assignee: Bridgestone Sports Co., Ltd.Inventors: Atsushi Namba, Hirotaka Shinohara, Kae Iizuka
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Publication number: 20200206579Abstract: A golf ball for amateur golfers exhibits excellent flight characteristics when hit by the average golfer and also has a good feel at impact that is both soft and solid. The golf ball includes a core, an intermediate layer and a cover, and has coefficient of restitution and compressive deformation relationships that satisfy specific conditions.Type: ApplicationFiled: December 20, 2019Publication date: July 2, 2020Applicant: Bridgestone Sports Co., Ltd.Inventors: Katsunori SATO, Kae IIZUKA
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Publication number: 20200001138Abstract: In a golf ball having a core of at least one layer and a paint film of at least one layer, at least one layer of the paint film includes delustering particles and the same or a differing layer of the paint film includes an effect pigment. The ball is a matte golf ball that is free of luster and gloss and moreover has a quality look.Type: ApplicationFiled: June 17, 2019Publication date: January 2, 2020Applicant: Bridgestone Sports Co., Ltd.Inventors: Hirotaka Shinohara, Kae Iizuka, Atsushi Namba
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Publication number: 20200001139Abstract: A golf ball having a core of at least one layer is provided on the ball surface with a delustering particle-containing coating layer having an average surface roughness Ra of between 0.5 and 1.0. The golf ball is a matte ball that is free of luster and gloss and moreover can prevent a reduction in the ball spin rate on approach shots.Type: ApplicationFiled: June 18, 2019Publication date: January 2, 2020Applicant: Bridgestone Sports Co., Ltd.Inventors: Hirotaka Shinohara, Kae Iizuka, Atsushi Namba
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Publication number: 20190388734Abstract: A matte golf ball which is free of luster and gloss has such a good ball appearance that the injection marks which form during injection molding of the cover are not visible. The golf ball includes a core of at least one layer, a cover of at least one layer, and a paint film. The outermost layer of the cover is formed of a resin composition which includes a thermoplastic resin and a colorant comprising a fluorescent dye or a fluorescent pigment, and has a visible light transmittance with an average value at wavelengths in the 380 to 780 nm spectrum of from 2.0 to 50.0%. The paint film is formed of a urethane-based paint composition containing delustering particles.Type: ApplicationFiled: April 24, 2019Publication date: December 26, 2019Applicant: Bridgestone Sports Co., Ltd.Inventors: Atsushi Namba, Hirotaka Shinohara, Kae Iizuka
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Patent number: 10252481Abstract: A method for forming a golf ball provides a core member comprising a core of a golf ball into a cavity of a mold so that the core member is supported by a movable holding pin disposed in the mold; forming a layer outside the core member by injecting a material of the layer into the cavity; and retracting the pin from the cavity into the mold during the material injection so that a portion projecting from a surface of the layer is formed by a tip of the pin, the projecting portion having a site area of at least 0.2% in relation to an entire area of the tip of the pin and having a height of at least 0.2 mm. This method can be implemented by controlling the retraction of the pin, or alternatively by using the pin having a predetermined indentation portion on the tip.Type: GrantFiled: July 20, 2017Date of Patent: April 9, 2019Assignee: BRIDGESTONE SPORTS CO., LTD.Inventors: Kae Iizuka, Atsushi Komatsu, Masataka Kai, Katsunori Sato
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Publication number: 20180154218Abstract: In a golf ball having a core, an outermost layer and an intermediate layer therebetween, the intermediate layer is formed of a thermoplastic resin composition that includes (A) an ionic olefin-methacrylic acid-unsaturated carboxylic acid ester copolymer, (B) a nonionic olefin-acrylic acid copolymer, (C) an organic acid or a metal salt thereof, and (D) a basic inorganic metal compound, and the outermost layer is formed of a thermoplastic resin composition that includes (a) a specific ionic olefin-unsaturated to carboxylic acid copolymer and (h) a specific ionic olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer. The ratio (tan ?) between the tensile storage modulus (E?) and the tensile loss modulus (E?) in a dynamic viscoelasticity test on the outermost layer-forming resin composition conducted under specific conditions is not more than 0.150.Type: ApplicationFiled: November 16, 2017Publication date: June 7, 2018Applicant: Bridgestone Sports Co., Ltd.Inventors: Kae IIZUKA, Takanori TAGO
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Publication number: 20170313009Abstract: A method for forming a golf ball provides a core member comprising a core of a golf ball into a cavity of a mold so that the core member is supported by a movable holding pin disposed in the mold; forming a layer outside the core member by injecting a material of the layer into the cavity; and retracting the pin from the cavity into the mold during the material injection so that a portion projecting from a surface of the layer is formed by a tip of the pin, the projecting portion having a site area of at least 0.2% in relation to an entire area of the tip of the pin and having a height of at least 0.2 mm. This method can be implemented by controlling the retraction of the pin, or alternatively by using the pin having a predetermined indentation portion on the tip.Type: ApplicationFiled: July 20, 2017Publication date: November 2, 2017Applicant: BRIDGESTONE SPORTS CO., LTD.Inventors: Kae IIZUKA, Atsushi KOMATSU, Masataka KAI, Katsunori SATO
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Patent number: 9744735Abstract: A method for forming a golf ball provides a core member comprising a core of a golf ball into a cavity of a mold so that the core member is supported by a movable holding pin disposed in the mold; forming a layer outside the core member by injecting a material of the layer into the cavity; and retracting the pin from the cavity into the mold during the material injection so that a portion projecting from a surface of the layer is formed by a tip of the pin, the projecting portion having a site area of at least 0.2% in relation to an entire area of the tip of the pin and having a height of at least 0.2 mm. This method can be implemented by controlling the retraction of the pin, or alternatively by using the pin having a predetermined indentation portion on the tip.Type: GrantFiled: June 13, 2013Date of Patent: August 29, 2017Assignee: BRIDGESTONE SPORTS CO., LTD.Inventors: Kae Iizuka, Atsushi Komatsu, Masataka Kai, Katsunori Sato
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Publication number: 20160184646Abstract: The present invention is a golf ball with a spherical core and a cover with one or more than two layers which covers the core, wherein the core includes two layers including an inner core having a spherical shape with an area formed in the center thereof, and an outer core covering the inner core, wherein value A is equal to or larger than 10.5 and value C is equal to or smaller than 3.7, wherein the value A is the deformation amount (mm) of the ball when the initial load is 98 N (10 kgf) and the ending load is 5880 N (600 kgf), and the value C is the deformation amount (mm) of the ball when the initial load is 98 N (10 kgf) and the ending load is 1275 N (130 kgf). The area is filled with at least one substance being different from the material of the inner core.Type: ApplicationFiled: December 22, 2015Publication date: June 30, 2016Applicant: BRIDGESTONE SPORTS CO., LTD.Inventor: Kae IIZUKA
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Publication number: 20140367884Abstract: A method for forming a golf ball provides a core member comprising a core of a golf ball into a cavity of a mold so that the core member is supported by a movable holding pin disposed in the mold; forming a layer outside the core member by injecting a material of the layer into the cavity; and retracting the pin from the cavity into the mold during the material injection so that a portion projecting from a surface of the layer is formed by a tip of the pin, the projecting portion having a site area of at least 0.2% in relation to an entire area of the tip of the pin and having a height of at least 0.2 mm. This method can be implemented by controlling the retraction of the pin, or alternatively by using the pin having a predetermined indentation portion on the tip.Type: ApplicationFiled: June 13, 2013Publication date: December 18, 2014Inventors: Kae IIZUKA, Atsushi KOMATSU, Masataka KAI, Katsunori SATO
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Patent number: 8864605Abstract: In a colored golf ball having a core, a cover of two or more layers encasing the core, and a coat of paint applied to a surface of an outermost layer of the cover, the outermost cover layer is formed of a resin composition which includes (a) a thermoplastic resin, (b) a fluorescent color-containing color pigment and/or dye, and (c) titanium oxide. A layer adjoining an inner side of the outermost layer is formed of a resin composition containing a resin. The colored golf ball has an excellent rebound and weatherability, and also is endowed with a high brightness and a sense of quality and elegance.Type: GrantFiled: August 31, 2011Date of Patent: October 21, 2014Assignee: Bridgestone Sports Co., Ltd.Inventors: Kae Iizuka, Eiji Takehana, Hiroyuki Nagasawa
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Patent number: 8846794Abstract: The present invention provides a golf ball which includes (I) a first member composed of a material molded under heat from a rubber composition of (a) a base rubber composed primarily of a mixture of at least 60 wt % of a polybutadiene having a stress relaxation time (T80), as defined below, of less than 4 seconds and up to 40 wt % of a polybutadiene having a stress relaxation time (T80) of at least 4 seconds, (b) an unsaturated carboxylic acid and/or a metal salt thereof, and (c) an organic peroxide; and (II) a second member composed of a specific, highly-neutralized, resin composition. The golf ball of the invention, by being thus constituted, has an excellent resilience for the ball as a whole, a good, soft, feel on impact, and imparts an excellent spin performance, thereby enabling an increased distance to be achieved. In addition, it has a high manufacturability.Type: GrantFiled: April 23, 2009Date of Patent: September 30, 2014Assignee: Bridgestone Sports Co., Ltd.Inventors: Jun Shindo, Kae Iizuka
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Patent number: 8834296Abstract: A multi-piece solid golf ball composed of a solid core having an inner core layer and an outer core layer encased by a cover including at least an inner cover layer and an outer cover layer. The inner core layer has a JIS-C cross-sectional hardness of from 60 to 83 at any single point on a cross-section, and has a cross-sectional hardness difference between any two points on the cross-section of within ±5. The ball has specific relationships between the hardness of the inner core layer 1 mm inside a boundary between the inner core layer and the outer core layer, the hardness of the outer core layer 1 mm outside the boundary, and the surface hardness of the outer core layer. And, the outer cover layer has the specific thickness and Shore D hardness, which is higher than that of the inner cover layer.Type: GrantFiled: March 23, 2011Date of Patent: September 16, 2014Assignee: Bridgestone Sports Co., Ltd.Inventors: Junji Umezawa, Kae Iizuka, Daisuke Arai, Hiroshi Higuchi
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Patent number: 8827840Abstract: A multi-piece solid golf ball composed of a solid core having an inner core layer and an outer core layer encased by a cover including at least an inner cover layer and an outer cover layer. The inner core layer has a JIS-C cross-sectional hardness of from 60 to 83 at any single point on a cross-section, and has a cross-sectional hardness difference between any two points on the cross-section of within ±5. The ball has specific relationships between the hardness of the inner core layer 1 mm inside a boundary between the inner core layer and the outer core layer, the hardness of the outer core layer 1 mm outside the boundary, and the surface hardness of the outer core layer. And, the outer cover layer has the specific Shore D hardness, which is lower than that of the inner cover layer.Type: GrantFiled: March 23, 2011Date of Patent: September 9, 2014Assignee: Bridgestone Sports Co., Ltd.Inventors: Junji Umezawa, Kae Iizuka, Daisuke Arai, Hiroshi Higuchi
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Patent number: 8814726Abstract: A multi-piece solid golf ball composed of a solid core having an inner core layer and an outer core layer encased by a cover including at least an inner cover layer and an outer cover layer. The inner core layer has a JIS-C cross-sectional hardness of from 60 to 83 at any single point on a cross-section, and has a cross-sectional hardness difference between any two points on the cross-section of within ±5. The ball has specific relationships between the hardness of the inner core layer 1 mm inside a boundary between the inner core layer and the outer core layer, the hardness of the outer core layer 1 mm outside the boundary, and the surface hardness of the outer core layer. And, the difference in Shore D hardness between the inner cover layer and the outer cover layer is within ±5.Type: GrantFiled: March 23, 2011Date of Patent: August 26, 2014Assignee: Bridgestone Sports Co., Ltd.Inventors: Junji Umezawa, Kae Iizuka, Daisuke Arai, Hiroshi Higuchi
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Patent number: 8808111Abstract: A multi-piece solid golf ball composed of a solid core having an inner core layer and an outer core layer encased by a cover of one or more layer. The inner core layer has a JIS-C cross-sectional hardness of from 60 to 83 at any single point on a cross-section, and has a cross-sectional hardness difference between any two points on the cross-section of within ±5. The ball has specific relationships between the hardness of the inner core layer 1 mm inside a boundary between the inner core layer and the outer core layer, the hardness of the outer core layer 1 mm outside the boundary, and the surface hardness of the outer core layer.Type: GrantFiled: March 23, 2011Date of Patent: August 19, 2014Assignee: Bridgestone Sports Co., Ltd.Inventors: Junji Umezawa, Kae Iizuka, Daisuke Arai, Hiroshi Higuchi
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Patent number: 8808110Abstract: A multi-piece solid golf ball composed of a solid core having an inner core layer and an outer core layer encased by a cover of one or more layer. The inner core layer has a JIS-C cross-sectional hardness of from 60 to 83 at any single point on a cross-section obtained by cutting the inner core layer in half, and has a cross-sectional hardness difference between any two points on the cross-section of within ±5. The ball has specific relationships between the hardness of the inner core layer 1 mm inside a boundary between the inner core layer and the outer core layer, the hardness of the outer core layer 1 mm outside the boundary, and the surface hardness of the outer core layer.Type: GrantFiled: March 23, 2011Date of Patent: August 19, 2014Assignee: Bridgestone Sports Co., Ltd.Inventors: Junji Umezawa, Kae Iizuka, Daisuke Arai, Hiroshi Higuchi
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Patent number: 8672776Abstract: The invention provides a multi-piece solid golf ball composed of a solid core, a cover, at least one intermediate layer situated therebetween, and a plurality of dimples on a surface of the ball. The diameter of the solid core, the deflection of the core when compressed under a final load of 130 kgf from an initial load of 10 kgf, the hardness at the center of the core, the hardness in a region 5 mm to 10 mm from the center of the core, the hardness 15 mm from the center of the core, and the surface hardness are set within specific ranges. The intermediate layer is composed primarily of a material obtained by mixing under applied heat a specific resin composition. The golf ball of the invention has an excellent flight performance, feel, controllability and scuff resistance.Type: GrantFiled: December 28, 2010Date of Patent: March 18, 2014Assignee: Bridgestone Sports Co., Ltd.Inventors: Hiroshi Higuchi, Junji Umezawa, Toru Ogawana, Hiroyuki Nagasawa, Kae Iizuka