Patents by Inventor Kohei Mimura
Kohei Mimura 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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Publication number: 20170182371Abstract: A golf ball 2 includes an inner core 4, an outer core 6, a mid layer 8, a cover 10, and dimples 12. A diameter D1, a volume V1, a hardness H1o at a central point, a boundary inside hardness H1in, and a hardness difference De1 of the inner core 4; a volume V2 (mm3) and a hardness difference De2 of the outer core 6; a thickness Tm and a hardness Hm of the mid layer 8; and a thickness Tc and a hardness Hc of the cover 10 meet the following mathematical formulas. 1.0<V2/V1<7.0 De2?De1<0 600<(H1o*H1in)*(D1/2)/2<1000 620<Tc*Hc*Hm/Tm<900 The dimples 12 include a plurality of small dimples each having an area of less than 8.0 mm2.Type: ApplicationFiled: November 28, 2016Publication date: June 29, 2017Applicant: DUNLOP SPORTS CO. LTD.Inventors: Kohei MIMURA, Kazuya KAMINO, Kosuke TACHIBANA
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Publication number: 20170173402Abstract: A golf ball 2 includes an inner core 4, an outer core 6, a mid layer 8, a cover 10, and dimples 12. A diameter D1, a volume V1, a hardness H1o at a central point, a boundary inside hardness H1in, and a hardness difference De1 of the inner core 4; a volume V2 (mm3) and a hardness difference De2 of the outer core 6; a thickness Tm and a hardness Hm of the mid layer 8; and a thickness Tc and a hardness Hc of the cover 10 meet the following mathematical formulas. 1.0<V2/V1<7.0 De2?De1<0 600<(H1o*H1in)*(D1/2)/2<1000 620<Tc*Hc*Hm/Tm<900 A dimple pattern of each hemisphere of the golf ball 2 includes three units rotationally symmetrical to each other.Type: ApplicationFiled: December 20, 2016Publication date: June 22, 2017Applicant: DUNLOP SPORTS CO. LTD.Inventors: Takahiro SAJIMA, Kohei MIMURA, Kosuke TACHIBANA, Kazuya KAMINO
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Publication number: 20170165528Abstract: A golf ball 2 includes a core 4, a mid layer 6, and a cover 8. A difference DH in hardness between a surface and a central point of the core 4; a thickness Tm (mm), a hardness Hm, and a volume Vm (mm3) of the mid layer 6; and a thickness Tc (mm), a hardness Hc, and a virtual volume Vc (mm3) of the cover 8 meet the following mathematical formulas. (DH*Hm)/(Hc*Tc)>63 3.0<((Vm*Hm)/(Vc*Hc))<7.5 A dimple pattern of each hemisphere of the golf ball 2 includes three units that are rotationally symmetrical to each other. A dimple pattern of each unit includes two small units that are mirror-symmetrical to each other.Type: ApplicationFiled: November 16, 2016Publication date: June 15, 2017Applicant: DUNLOP SPORTS CO. LTD.Inventors: Hironori TAKIHARA, Kohei MIMURA, Kosuke TACHIBANA, Kazuya KAMINO
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Publication number: 20170157468Abstract: A golf ball 2 has a plurality of dimples on a surface thereof. A ratio So of a sum of areas of the dimples relative to a surface area of a phantom sphere of the golf ball is equal to or greater than 81.0%. A ratio Rs of a number of the dimples each having a diameter of equal to or greater than 9.60% but equal to or less than 10.37%, of a diameter of the golf ball, relative to a total number of the dimples, is equal to or greater than 50%. A dimple pattern of each hemisphere of the phantom sphere includes three units that are rotationally symmetrical to each other. A dimple pattern of each unit includes two small units that are mirror-symmetrical to each other. The golf ball meets the following mathematical formula (1). Rs??2.Type: ApplicationFiled: October 31, 2016Publication date: June 8, 2017Applicant: DUNLOP SPORTS CO. LTD.Inventors: Kohei MIMURA, Takahiro SAJIMA
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Publication number: 20170144029Abstract: A golf ball 2 includes a core 4, a mid layer 6, and a cover 8. A difference DH in hardness between a surface and a central point of the core 4, a thickness Tm and a hardness Hm of the mid layer 6, a thickness Tc and a hardness Hc of the cover 8, and an amount of compressive deformation Sb of the golf ball 2 meet the following mathematical formulas. (DH*Hm)/(Hc*c)>80 ((Sb*c)/(Hc*Hm*Tm))*1000>0.75 The golf ball 2 further includes a plurality of small dimples each having an area of less than 8.0 mm2 and a plurality of large dimples each having an area of equal to or greater than 8.0 mm2.Type: ApplicationFiled: November 22, 2016Publication date: May 25, 2017Applicant: DUNLOP SPORTS CO. LTD.Inventors: Kazuya KAMINO, Kosuke TACHIBANA, Kohei MIMURA
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Patent number: 9555289Abstract: A golf ball has a large number of dimples on a surface thereof. The golf ball meets the following mathematical formula (I): 1.320?L1?1.420 (I), where L1 represents a ratio of a lift coefficient CL1 which is measured under conditions of a Reynolds number of 1.290×105 and a spin rate of 2820 rpm, relative to a lift coefficient CL2 which is measured under conditions of a Reynolds number of 1.290×105 and a spin rate of 1740 rpm.Type: GrantFiled: June 24, 2015Date of Patent: January 31, 2017Assignee: DUNLOP SPORTS CO. LTD.Inventors: Kohei Mimura, Takahiro Sajima, Hyoungchol Kim, Masahide Onuki
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Patent number: 9550093Abstract: A golf ball 2 includes a core 4, a mid layer 6 and a cover 8. The golf ball 2 further includes a large number of dimples 10 on a surface thereof. The surface has a northern hemisphere N and a southern hemisphere S. Each of the hemispheres has a high-latitude region 14, a mid-latitude region 18 and a low-latitude region 16. The number of planes that can divide a dimple pattern of the hemisphere so that divided dimple patterns are mirror symmetry to each other is one. Neither a dimple pattern of the high-latitude region 14 nor a dimple pattern of the low-latitude region 16 is rotationally symmetrical. A product THm of a thickness and a hardness for the mid layer 6, and a product THc of a thickness and a hardness for the cover 8 satisfy the following mathematical formula.Type: GrantFiled: August 28, 2015Date of Patent: January 24, 2017Assignee: DUNLOP SPORTS CO. LTD.Inventors: Kohei Mimura, Takahiro Sajima
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Publication number: 20160332033Abstract: A golf ball according to the present invention includes a spherical core, a cover member including at least one layer that covers the core, and at least one coating layer that covers the cover member constituting an outermost layer. A plurality of dimples are formed in the cover member constituting the outermost layer. Roughness is formed on the surface of the coating layer. A maximum height Rz and an arithmetic average roughness Ra of the surface of the coating layer satisfy a relationship Rz?Ra×6.0. The coating layer contains a lustrous material.Type: ApplicationFiled: April 20, 2016Publication date: November 17, 2016Applicant: DUNLOP SPORTS CO. LTD.Inventors: Yoshiko MATSUYAMA, Takahiro SAJIMA, Kohei MIMURA
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Publication number: 20160310798Abstract: An object of the present invention is to provide a golf ball traveling a great distance on driver shots.Type: ApplicationFiled: April 19, 2016Publication date: October 27, 2016Applicant: Dunlop Sports Co. Ltd.Inventors: Kohei MIMURA, Takahiro SAJIMA, Kosuke TACHIBANA
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Publication number: 20160310800Abstract: An object of the present invention is to provide a golf ball traveling a great distance on driver shots and on iron shots.Type: ApplicationFiled: April 26, 2016Publication date: October 27, 2016Applicant: Dunlop Sports Co. Ltd.Inventors: Hironori TAKIHARA, Kosuke TACHIBANA, Takahiro SAJIMA, Kohei MIMURA
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Publication number: 20160287942Abstract: A golf ball has, on a surface thereof, a rugged pattern composed of a land and a large number of dimples. A method for designing the rugged pattern includes the steps of: (1) assuming a large number of circles on a surface of a phantom sphere; (2) assuming a large number of generating points 16 based on positions of the large number of circles; (3) assuming a large number of Voronoi regions 18 on the surface of the phantom sphere by a Voronoi tessellation based on the large number of generating points 16; and (4) assigning a dimple and a land to the surface of the phantom sphere based on contours of the large number of Voronoi regions 18.Type: ApplicationFiled: June 9, 2016Publication date: October 6, 2016Applicant: DUNLOP SPORTS CO. LTD.Inventors: Hyoungchol KIM, Masahide ONUKI, Takahiro SAJIMA, Kohei MIMURA
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Publication number: 20160263442Abstract: A golf ball that enhances flight performance is provided. A golf ball according to the present invention includes a spherical core, at least one cover member that covers the core, and a coating layer that covers the cover member configuring the outermost layer. A plurality of dimples are formed in the cover member configuring the outermost layer. The thickness of the coating layer is 5.0 ?m or more. Roughness is formed on the surface of the coating layer after coating the cover member configuring the outermost layer. The maximum height Rz and the arithmetic average roughness Ra of the surface of the coating layer satisfy the relationship Rz?Ra×6.0.Type: ApplicationFiled: May 24, 2016Publication date: September 15, 2016Applicant: DUNLOP SPORTS CO. LTD.Inventors: Takahiro SAJIMA, Kohei MIMURA
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Patent number: 9403062Abstract: A golf ball has, on a surface thereof, a rugged pattern composed of a land and a large number of dimples. A method for designing the rugged pattern includes the steps of: (1) assuming a large number of circles on a surface of a phantom sphere; (2) assuming a large number of generating points 16 based on positions of the large number of circles; (3) assuming a large number of Voronoi regions 18 on the surface of the phantom sphere by a Voronoi tessellation based on the large number of generating points 16; and (4) assigning a dimple and a land to the surface of the phantom sphere based on contours of the large number of Voronoi regions 18.Type: GrantFiled: November 6, 2013Date of Patent: August 2, 2016Assignee: DUNLOP SPORTS CO. LTD.Inventors: Hyoungchol Kim, Masahide Onuki, Takahiro Sajima, Kohei Mimura
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Publication number: 20160184645Abstract: A golf ball has a large number of dimples 10 on a surface thereof. The dimples 10 include a plurality of small dimples 10S each having an area of less than 8.0 mm2, and a plurality of large dimples 10L each having an area of equal to or greater than 8.0 mm2. A ratio PS of a sum of areas of all the small dimples 10S to a surface area of a phantom sphere of the golf ball is less than 2.0%. The number NL of the large dimples 10L is equal to or greater than 250 but less than 450. The number NL of the large dimples 10L and a degree G of uniformity of areas of the large dimples 10L satisfy the following mathematical formula (II): G<0.0032·NL+0.26??(II).Type: ApplicationFiled: October 21, 2015Publication date: June 30, 2016Applicant: DUNLOP SPORTS CO. LTD.Inventors: Kohei Mimura, Takahiro Sajima
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Publication number: 20160184648Abstract: A golf ball has a large number of dimples 10 on a surface thereof. The dimples 10 include a plurality of small dimples 10S each having an area of less than 8.0 mm2, and a plurality of large dimples 10L each having an area of equal to or greater than 8.0 mm2. A ratio PS of a sum of areas of all the small dimples 10S to a surface area of a phantom sphere of the golf ball is less than 2.0%. A ratio PL of a sum of areas of all the large dimples 10L to the surface area of the phantom sphere is equal to or greater than 79.0%. A degree G of uniformity of areas of the large dimples 10L is equal to or less than 1.15.Type: ApplicationFiled: November 5, 2015Publication date: June 30, 2016Applicant: DUNLOP SPORTS CO. LTD.Inventors: Kohei MIMURA, Takahiro SAJIMA, Hironori TAKIHARA
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Patent number: 9375611Abstract: A golf ball that enhances flight performance is provided. A golf ball according to the present invention includes a spherical core, at least one cover member that covers the core, and a coating layer that covers the cover member configuring the outermost layer. A plurality of dimples are formed in the cover member configuring the outermost layer. The thickness of the coating layer is 5.0 ?m or more. Roughness is formed on the surface of the coating layer after coating the cover member configuring the outermost layer. The maximum height Rz and the arithmetic average roughness Ra of the surface of the coating layer satisfy the relationship Rz?Ra×6.0.Type: GrantFiled: December 26, 2014Date of Patent: June 28, 2016Assignee: DUNLOP SPORTS CO. LTD.Inventors: Takahiro Sajima, Kohei Mimura
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Publication number: 20160096076Abstract: A golf ball 2 has a large number of dimples 10 on a surface thereof. The contours of the dimples 10 are non-circular. A standard deviation of areas of the dimples 10 is equal to or less than 1.7 mm2. A ratio of a total area of the dimples 10 relative to a surface area of a phantom sphere of the golf ball 2 is equal to or greater than 80%. By comparting lines CS obtained by projecting sides of a regular dodecahedron, which is inscribed in the phantom sphere, onto the phantom sphere, a surface of the phantom sphere can be divided into 12 units Ut each of which meets the following mathematical formula (I): ?2?(Nt/12)?Nu?2??(I), where Nt represents the total number of the dimples 10 and Nu represents the number of the dimples 10 on one unit.Type: ApplicationFiled: September 17, 2015Publication date: April 7, 2016Applicant: DUNLOP SPORTS CO. LTD.Inventors: Kohei MIMURA, Takahiro SAJIMA, Hyoungchol KIM
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Publication number: 20160059081Abstract: A golf ball 2 includes a core 4, a mid layer 6 and a cover 8. The golf ball 2 further includes a large number of dimples 10 on a surface thereof. The surface has a northern hemisphere N and a southern hemisphere S. Each of the hemispheres has a high-latitude region 14, a mid-latitude region 18 and a low-latitude region 16. The number of planes that can divide a dimple pattern of the hemisphere so that divided dimple patterns are mirror symmetry to each other is one. Neither a dimple pattern of the high-latitude region 14 nor a dimple pattern of the low-latitude region 16 is rotationally symmetrical. A product THm of a thickness and a hardness for the mid layer 6, and a product THc of a thickness and a hardness for the cover 8 satisfy the following mathematical formula.Type: ApplicationFiled: August 28, 2015Publication date: March 3, 2016Applicant: DUNLOP SPORTS CO. LTD.Inventors: Kohei MIMURA, Takahiro SAJIMA
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Publication number: 20150375047Abstract: A golf ball 2 includes a large number of dimples 10 on a surface thereof. The surface has a northern hemisphere N and a southern hemisphere S. Each of the hemispheres has a high-latitude region 14, a mid-latitude region 18 and a low-latitude region 16. The high-latitude region 14 has a latitude range of 40° or greater but 90° or less. The mid-latitude region 18 has a latitude range of 20° or greater but less than 40°. The low-latitude region 16 has a latitude range of 0° or greater but less than 20°. The number of planes that can divide a dimple pattern of the hemisphere so that divided dimple patterns are mirror symmetry to each other is one. Neither a dimple pattern of the high-latitude region 14 nor a dimple pattern of the low-latitude region 16 is rotationally symmetrical.Type: ApplicationFiled: June 26, 2015Publication date: December 31, 2015Applicant: DUNLOP SPORTS CO. LTD.Inventors: Takahiro SAJIMA, Kohei MIMURA
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Publication number: 20150375049Abstract: A golf ball has a large number of dimples on a surface thereof. The golf ball meets the following mathematical formula (I): 1.320?L1?1.420 (I), where L1 represents a ratio of a lift coefficient CL1 which is measured under conditions of a Reynolds number of 1.290×105 and a spin rate of 2820 rpm, relative to a lift coefficient CL2 which is measured under conditions of a Reynolds number of 1.290×105 and a spin rate of 1740 rpm.Type: ApplicationFiled: June 24, 2015Publication date: December 31, 2015Applicant: DUNLOP SPORTS CO. LTD.Inventors: Kohei MIMURA, Takahiro SAJIMA, Hyoungchol KIM, Masahide ONUKI