Patents by Inventor Masanobu KUWAHARA
Masanobu KUWAHARA 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: 11654335Abstract: In a golf ball having a core, an envelope layer, an intermediate layer and a cover, the difference between the center hardness and the surface hardness of the core is set in a specific range, the intermediate layer is formed of a resin material that includes a high-acid ionomer, the Shore C hardness relationships among the core center and the surfaces of the envelope-encased layer and the intermediate layer-encased sphere satisfy specific conditions; and the ball has a deflection when compressed under a given load which is at least 2.7 mm. This ball achieves a good distance on shots with a driver, utility club or iron, is receptive to spin in the short game, and has a soft feel at impact on all shots, making it useful to amateur golfers.Type: GrantFiled: October 13, 2021Date of Patent: May 23, 2023Assignee: Bridgestone Sports Co., Ltd.Inventors: Hideo Watanabe, Masanobu Kuwahara
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Patent number: 11504584Abstract: A golf ball of the present disclosure includes an inner ball and a cover layer that covers the outer surface of the inner ball and includes an outer surface with dimples. The inner ball includes an inner layer, which includes an outer surface with a recess, and an inner film that covers only the surface of the recess on the outer surface of the inner layer. The inner layer and the inner film are different colors from each other, and the cover layer is transparent or semi-transparent. Peeling of the film can be suppressed in the golf ball.Type: GrantFiled: May 17, 2021Date of Patent: November 22, 2022Assignee: BRIDGESTONE SPORTS CO., LTD.Inventors: Hirotaka Shinohara, Masanobu Kuwahara
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Publication number: 20220143472Abstract: In a golf ball having a core, an envelope layer, an intermediate layer and a cover, the difference between the center hardness and the surface hardness of the core is set in a specific range, the intermediate layer is formed of a resin material that includes a high-acid ionomer, the Shore C hardness relationships among the core center and the surfaces of the envelope-encased layer and the intermediate layer-encased sphere satisfy specific conditions; and the ball has a deflection when compressed under a given load which is at least 2.7 mm. This ball achieves a good distance on shots with a driver, utility club or iron, is receptive to spin in the short game, and has a soft feel at impact on all shots, making it useful to amateur golfers.Type: ApplicationFiled: October 13, 2021Publication date: May 12, 2022Applicant: Bridgestone Sports Co., Ltd.Inventors: Hideo Watanabe, Masanobu Kuwahara
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Publication number: 20210387058Abstract: A golf ball of the present disclosure includes an inner ball and a cover layer that covers the outer surface of the inner ball and includes an outer surface with dimples. The inner ball includes an inner layer, which includes an outer surface with a recess, and an inner film that covers only the surface of the recess on the outer surface of the inner layer. The inner layer and the inner film are different colors from each other, and the cover layer is transparent or semi-transparent. Peeling of the film can be suppressed in the golf ball.Type: ApplicationFiled: May 17, 2021Publication date: December 16, 2021Applicant: BRIDGESTONE SPORTS CO.,LTD.Inventors: Hirotaka SHINOHARA, Masanobu KUWAHARA
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Patent number: 11052291Abstract: The golf ball 1 includes a surface having multiple dimples thereon. When a lift coefficient measured under conditions with a Reynolds number of 80000 and a spin rate of 2000 rpm is CL1, and when a lift coefficient measured under conditions with a Reynolds number of 70000 and a spin rate of 1900 rpm is CL2, CL1 and CL2 satisfy 0.990?CL2/CL1.Type: GrantFiled: October 6, 2020Date of Patent: July 6, 2021Assignee: BRIDGESTONE SPORTS CO., LTD.Inventor: Masanobu Kuwahara
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Publication number: 20210170238Abstract: The golf ball 1 includes a surface having multiple dimples thereon. When a lift coefficient measured under conditions with a Reynolds number of 80000 and a spin rate of 2000 rpm is CL1, and when a lift coefficient measured under conditions with a Reynolds number of 70000 and a spin rate of 1900 rpm is CL2, CL1 and CL2 satisfy 0.990?CL2/CL1.Type: ApplicationFiled: October 6, 2020Publication date: June 10, 2021Applicant: BRIDGESTONE SPORTS CO.,LTD.Inventor: Masanobu KUWAHARA
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Patent number: 10967226Abstract: In a golf ball having a two-layer core consisting of an inner core layer and an outer core layer, one or more intermediate layer, and a cover serving as an outermost layer, the inner core layer and outer core layer are each formed primarily of a base rubber, the inner core layer has a diameter of at least 19 mm, the intermediate layer and the cover are each formed primarily of a resin material, and the overall core has a specific hardness profile. The golf ball has a high initial velocity while holding down the spin rate on full shots with a driver or long iron, thus enabling a good distance to be achieved. The ball also has a high controllability in the short game.Type: GrantFiled: June 15, 2020Date of Patent: April 6, 2021Assignee: Bridgestone Sports Co., Ltd.Inventors: Hideo Watanabe, Akira Kimura, Masanobu Kuwahara
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Patent number: 10953287Abstract: In a golf ball having a core, an intermediate layer and a cover, the intermediate layer-encased sphere has a higher surface hardness than the ball. The core hardness profile in the ball is designed such that the core surface has a Shore C hardness value which is at least 27 higher than the Shore C hardness value at the core center, and the surface areas A to F calculated from hardness differences between positions located at specific distances in the core and differences between the specific distances satisfy a specific formula. This golf ball has an excellent flight performance when struck by skilled amateur golfers and professionals, and also has a good controllability on shots with an iron.Type: GrantFiled: February 24, 2020Date of Patent: March 23, 2021Assignee: Bridgestone Sports Co., Ltd.Inventors: Hideo Watanabe, Masanobu Kuwahara
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Publication number: 20200330826Abstract: In a golf ball having a two-layer core consisting of an inner core layer and an outer core layer, one or more intermediate layer, and a cover serving as an outermost layer, the inner core layer and outer core layer are each formed primarily of a base rubber, the inner core layer has a diameter of at least 19 mm, the intermediate layer and the cover are each formed primarily of a resin material, and the overall core has a specific hardness profile. The golf ball has a high initial velocity while holding down the spin rate on full shots with a driver or long iron, thus enabling a good distance to be achieved. The ball also has a high controllability in the short game.Type: ApplicationFiled: June 15, 2020Publication date: October 22, 2020Applicant: Bridgestone Sports Co., Ltd.Inventors: Hideo WATANABE, Akira Kimura, Masanobu Kuwahara
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Patent number: 10765917Abstract: In a multi-piece solid golf ball having a core, an intermediate layer encasing the core and a cover which encases the intermediate layer and has numerous dimples on an outside surface thereof, the intermediate layer is formed of a resin material, the cover is formed of a urethane resin material, the core has a diameter of at least 38.0 mm, the sphere obtained by encasing the core with the intermediate layer has a surface hardness on the Shore D hardness scale of at least 69, the cover has a material hardness on the Shore D hardness scale of 55 or less, the (intermediate layer thickness)/(core diameter) value is from 0.025 to 0.043, the (cover thickness)/(core diameter) value is from 0.014 to 0.027, and the sphere obtained by encasing the core with the intermediate layer has an initial velocity A and the core has an initial velocity B which together satisfy the condition A?B?0 m/s.Type: GrantFiled: November 19, 2018Date of Patent: September 8, 2020Assignee: Bridgestone Sports Co., Ltd.Inventors: Hideo Watanabe, Katsunori Sato, Masanobu Kuwahara
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Patent number: 10758786Abstract: In a golf ball having a two-layer core consisting of an inner core layer and an outer core layer, one or more intermediate layer, and a cover serving as an outermost layer, the inner core layer and outer core layer are each formed primarily of a base rubber, the inner core layer has a diameter of at least 21 mm, the intermediate layer and the cover are each formed primarily of a resin material, and the overall core has a specific hardness profile. The golf ball has a high initial velocity while holding down the spin rate on full shots with a driver or long iron, thus enabling a good distance to be achieved. The ball also has a high controllability in the short game.Type: GrantFiled: October 29, 2018Date of Patent: September 1, 2020Assignee: Bridgestone Sports Co., Ltd.Inventors: Hideo Watanabe, Akira Kimura, Masanobu Kuwahara
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Publication number: 20200206580Abstract: In a golf ball having a core, an intermediate layer and a cover, the intermediate layer-encased sphere has a higher surface hardness than the ball. The core hardness profile in the ball is designed such that the core surface has a Shore C hardness value which is at least 27 higher than the Shore C hardness value at the core center, and the surface areas A to F calculated from hardness differences between positions located at specific distances in the core and differences between the specific distances satisfy a specific formula. This golf ball has an excellent flight performance when struck by skilled amateur golfers and professionals, and also has a good controllability on shots with an iron.Type: ApplicationFiled: February 24, 2020Publication date: July 2, 2020Applicant: Bridgestone Sports Co., Ltd.Inventors: Hideo WATANABE, Masanobu KUWAHARA
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Patent number: 10639523Abstract: In a golf ball having a two-layer core consisting of an inner core layer and an outer core layer, an intermediate layer and a cover, the core is formed primarily of a base rubber, the diameter of the inner core layer is at least 21 mm, the intermediate layer and cover are each formed primarily of a resin material, the overall core has a specific hardness profile, the inner core layer has a higher specific gravity than the outer core layer, and the sphere consisting of the core encased by the intermediate layer has a higher surface hardness than the ball. This golf ball has a high initial velocity at impact while holding down the spin rate on full shots with a driver or long iron, enabling a good distance to be achieved. The ball also has a good controllability in the short game.Type: GrantFiled: February 19, 2019Date of Patent: May 5, 2020Assignee: Bridgestone Sports Co., Ltd.Inventors: Hideo Watanabe, Akira Kimura, Masanobu Kuwahara
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Publication number: 20200108299Abstract: In a multi-piece solid golf ball made up of, successively, a core, an intermediate layer and a cover having numerous dimples on the surface thereof, the intermediate layer is formed of a resin material and the cover is formed of a urethane resin material, each having a specific respective Shore D hardness. The ball has a specific (intermediate layer thickness)/(core diameter) value and a specific (cover thickness)/(core diameter) value, and the core has a specific deflection and has a specific hardness profile from a center to a surface thereof. This golf ball provides an increased distance and has both a soft feel when played and a high durability to repeated impact.Type: ApplicationFiled: November 19, 2019Publication date: April 9, 2020Applicant: Bridgestone Sports Co., Ltd.Inventors: Hideo Watanabe, Katsunori Sato, Masanobu Kuwahara
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Patent number: 10610741Abstract: In a golf ball having a core, an intermediate layer and a cover, the intermediate layer-encased sphere has a higher surface hardness than the ball. The core hardness profile in the ball is designed such that the core surface has a Shore C hardness value which is at least 28 higher than the Shore C hardness value at the core center, and the surface areas A to F calculated from hardness differences between positions located at specific distances in the core and differences between the specific distances satisfy a specific formula. This golf ball has an excellent flight performance when struck by skilled amateur golfers and professionals, and also has a good controllability on shots with an iron.Type: GrantFiled: April 5, 2019Date of Patent: April 7, 2020Assignee: Bridgestone Sports Co., Ltd.Inventors: Hideo Watanabe, Masanobu Kuwahara
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Patent number: 10512823Abstract: In a multi-piece solid golf ball made up of, successively, a core, an intermediate layer and a cover having numerous dimples on the surface thereof, the intermediate layer is formed of a resin material and the cover is formed of a urethane resin material, each having a specific respective Shore D hardness. The ball has a specific (intermediate layer thickness)/(core diameter) value and a specific (cover thickness)/(core diameter) value, and the core has a specific deflection. The sphere consisting of the core encased by the intermediate layer has an initial velocity A and the core has an initial velocity B which together satisfy the condition A?B?0 m/s. This golf ball provides an increased distance and has both a soft feel when played and a high durability to repeated impact.Type: GrantFiled: April 9, 2018Date of Patent: December 24, 2019Assignee: Bridgestone Sports Co., Ltd.Inventors: Hideo Watanabe, Katsunori Sato, Masanobu Kuwahara
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Publication number: 20190351293Abstract: In a golf ball having a core, an intermediate layer and a cover, the intermediate layer-encased sphere has a higher surface hardness than the ball. The core hardness profile in the ball is designed such that the core surface has a Shore C hardness value which is at least 28 higher than the Shore C hardness value at the core center, and the surface areas A to F calculated from hardness differences between positions located at specific distances in the core and differences between the specific distances satisfy a specific formula. This golf ball has an excellent flight performance when struck by skilled amateur golfers and professionals, and also has a good controllability on shots with an iron.Type: ApplicationFiled: April 5, 2019Publication date: November 21, 2019Applicant: Bridgestone Sports Co., Ltd.Inventors: Hideo WATANABE, Masanobu Kuwahara
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Publication number: 20190351292Abstract: A golf ball for amateur golfers is endowed with both an excellent flight when hit by golfers whose head speed is not very high and a soft yet good feel at impact. The ball has a core, an envelope layer, an intermediate layer and a cover. The core is formed primarily of a base rubber and the intermediate layer is formed so as to be thicker than the envelope layer and the cover. The respective surface hardnesses of the core, envelope layer-encased sphere, intermediate layer-encased sphere and ball satisfy a specific relationship. The core hardness profile is designed such that the surface areas A to F calculated from hardness differences between positions located at specific distances in the core and differences between the specific distances satisfy a specific formula.Type: ApplicationFiled: April 9, 2019Publication date: November 21, 2019Applicant: Bridgestone Sports Co., Ltd.Inventors: Hideo WATANABE, Masanobu KUWAHARA
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Publication number: 20190255392Abstract: In a golf ball having a two-layer core consisting of an inner core layer and an outer core layer, an intermediate layer and a cover, the core is formed primarily of a base rubber, the diameter of the inner core layer is at least 21 mm, the intermediate layer and cover are each formed primarily of a resin material, the overall core has a specific hardness profile, the inner core layer has a higher specific gravity than the outer core layer, and the sphere consisting of the core encased by the intermediate layer has a higher surface hardness than the ball. This golf ball has a high initial velocity at impact while holding down the spin rate on full shots with a driver or long iron, enabling a good distance to be achieved. The ball also has a good controllability in the short game.Type: ApplicationFiled: February 19, 2019Publication date: August 22, 2019Applicant: Bridgestone Sports Co., Ltd.Inventors: Hideo WATANABE, Akira KIMURA, Masanobu KUWAHARA
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Publication number: 20190217161Abstract: In a multi-piece solid golf ball having a core, an intermediate layer encasing the core and a cover which encases the intermediate layer and has numerous dimples on an outside surface thereof, the intermediate layer is formed of a resin material, the cover is formed of a urethane resin material, the core has a diameter of at least 38.0 mm, the sphere obtained by encasing the core with the intermediate layer has a surface hardness on the Shore D hardness scale of at least 69, the cover has a material hardness on the Shore D hardness scale of 55 or less, the (intermediate layer thickness)/(core diameter) value is from 0.025 to 0.043, the (cover thickness)/(core diameter) value is from 0.014 to 0.027, and the sphere obtained by encasing the core with the intermediate layer has an initial velocity A and the core has an initial velocity B which together satisfy the condition A?B?0 m/s.Type: ApplicationFiled: November 19, 2018Publication date: July 18, 2019Applicant: Bridgestone Sports Co., Ltd.Inventors: Hideo Watanabe, Katsunori Sato, Masanobu Kuwahara