Patents by Inventor Yuichiro Ozawa
Yuichiro Ozawa 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: 11325011Abstract: A method of manufacturing golf balls having a core and a cover of at least one layer encasing the core includes the steps of producing a core by molding and vulcanizing a rubber composition containing (A) a base rubber, (B) an ?,?-unsaturated carboxylic acid and/or a metal salt thereof, and (C) an organic peroxide; and heat-treating the core for 1 to 24 hours at between 175 and 300° C. Golf balls which undergo little energy loss and have a high initial velocity can be obtained by this method.Type: GrantFiled: March 18, 2020Date of Patent: May 10, 2022Assignees: BRIDGESTONE CORPORATION, Bridgestone Sports Co., Ltd.Inventors: Tsuyoshi Nakajima, Yuichiro Ozawa, Daisuke Nakajima
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Publication number: 20200230469Abstract: A method of manufacturing golf balls having a core and a cover of at least one layer encasing the core includes the steps of producing a core by molding and vulcanizing a rubber composition containing (A) a base rubber, (B) an ?,?-unsaturated carboxylic acid and/or a metal salt thereof, and (C) an organic peroxide; and heat-treating the core for 1 to 24 hours at between 175 and 300° C. Golf balls which undergo little energy loss and have a high initial velocity can be obtained by this method.Type: ApplicationFiled: March 18, 2020Publication date: July 23, 2020Applicants: Bridgestone Sports Co., Ltd., BRIDGESTONE CORPORATIONInventors: Tsuyoshi NAKAJIMA, Yuichiro OZAWA, Daisuke NAKAJIMA
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Patent number: 10632347Abstract: A method of manufacturing golf balls having a core and a cover of at least one layer encasing the core includes the steps of producing a core by molding and vulcanizing a rubber composition containing (A) a base rubber, (B) an ?,?-unsaturated carboxylic acid and/or a metal salt thereof, and (C) an organic peroxide; and heat-treating the core for 1 to 24 hours at between 175 and 300° C. Golf balls which undergo little energy loss and have a high initial velocity can be obtained by this method.Type: GrantFiled: June 20, 2017Date of Patent: April 28, 2020Assignees: BRIDGESTONE CORPORATION, Bridgestone Sports Co., Ltd.Inventors: Tsuyoshi Nakajima, Yuichiro Ozawa, Daisuke Nakajima
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Patent number: 10369419Abstract: The invention provides a golf ball having a core and a cover of one layer or a plurality of layers, wherein the core is formed of a material molded under heat from a rubber composition containing (A) a base rubber, (B) an organic peroxide, and (C) water and/or a metal monocarboxylate, and has a hysteresis loss of 50% or less when compressed at a load cell speed of 500 mm/min and under a constant load of 5,000 N.Type: GrantFiled: June 16, 2017Date of Patent: August 6, 2019Assignee: Bridgestone Sports Co., Ltd.Inventors: Kae Ilzuka, Tsuyoshi Nakajima, Yuichiro Ozawa
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Patent number: 10279218Abstract: The invention provides a golf ball having a core and a cover of one layer or a plurality of layers, the core being formed of a material molded under heat from a rubber composition containing: (A) a base rubber, (B) an organic peroxide, and (C) water and/or a metal monocarboxylate. The core has a hardness profile which satisfies specific relationships between the JIS-C hardness at the core center (Cc), the JIS-C hardness at a position 10 mm from the core center (C10) and the JIS-C hardness at the core surface (Cs).Type: GrantFiled: November 22, 2017Date of Patent: May 7, 2019Assignee: Bridgestone Sports Co., Ltd.Inventors: Hideo Watanabe, Tsuyoshi Nakajima, Yuichiro Ozawa
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Patent number: 10124215Abstract: The invention provides a golf ball having a core and a cover of one layer or a plurality of layers, the core being formed of a material molded under heat from a rubber composition which includes (A) a base rubber, (B) an organic peroxide, and (C) water and/or a metal monocarboxylate. The product P×E of the difference P (mol/m3) in crosslink density between the core surface and the core center, as measured based on a toluene swelling test, multiplied by the deflection E (mm) of the core when compressed under a final load of 1,275 N (130 kgf) from an initial load state of 98 N (10 kgf) is at least 28×102 mol/m3·mm.Type: GrantFiled: June 15, 2017Date of Patent: November 13, 2018Assignee: Bridgestone Sports Co., Ltd.Inventors: Tsuyoshi Nakajima, Yuichiro Ozawa
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Patent number: 10065079Abstract: Golf ball having a core and a cover of one or more layers, the core being formed of a material molded under heat from a rubber composition including a base rubber, an organic peroxide, and water and/or a metal monocarboxylate. Defining the tan ? slope as (tan ?10?tan ?1)/(10%?1%), where tan ?1 and tan ?10 are the loss tangents at dynamic strains of, respectively, 1% and 10% when the loss tangents of the core center and the core surface are measured at ?12° C. and 15 Hz, the difference between the tan ? slopes at the core surface and the core center is larger than 0.002. Because a core material which undergoes little decrease in resilience over time and experiences little energy loss can be obtained, the golf ball maintains a good rebound, has a reduced spin rate and thus is able to achieve an increased distance.Type: GrantFiled: April 24, 2017Date of Patent: September 4, 2018Assignee: Bridgestone Sports Co., Ltd.Inventors: Tsuyoshi Nakajima, Yuichiro Ozawa
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Publication number: 20180093139Abstract: The invention provides a golf ball having a core and a cover of one layer or a plurality of layers, the core being formed of a material molded under heat from a rubber composition containing: (A) a base rubber, (B) an organic peroxide, and (C) water and/or a metal monocarboxylate. The core has a hardness profile which satisfies specific relationships between the JIS-C hardness at the core center (Cc), the JIS-C hardness at a position 10 mm from the core center (C10) and the JIS-C hardness at the core surface (Cs).Type: ApplicationFiled: November 22, 2017Publication date: April 5, 2018Applicant: Bridgestone Sports Co., Ltd.Inventors: Hideo WATANABE, Tsuyoshi NAKAJIMA, Yuichiro OZAWA
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Patent number: 9855466Abstract: The invention provides a golf ball having a core and a cover of one layer or a plurality of layers, the core being formed of a material molded under heat from a rubber composition containing: (A) a base rubber, (B) an organic peroxide, and (C) water and/or a metal monocarboxylate. The core has a hardness profile which satisfies specific relationships between the JIS-C hardness at the core center (Cc), the JIS-C hardness at a position 10 mm from the core center (C10) and the JIS-C hardness at the core surface (Cs).Type: GrantFiled: December 18, 2015Date of Patent: January 2, 2018Assignee: Bridgestone Sports Co., Ltd.Inventors: Hideo Watanabe, Tsuyoshi Nakajima, Yuichiro Ozawa
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Publication number: 20170368418Abstract: In a golf ball having a core and a cover of at least one layer encasing the core, the core is a product molded under heat from a rubber composition which includes (A) a base rubber, (B) an unsaturated carboxylic acid and/or a metal salt thereof, and (C) an organic peroxide. Letting the content of component (B) in the rubber composition per 100 parts by weight of component (A) be X parts by weight and the concentration of volatile substances from component (B) within the core be A wt %, the value A/X is 0.0123 or less. This golf ball has a low energy loss, enabling a high initial velocity to be obtained.Type: ApplicationFiled: June 20, 2017Publication date: December 28, 2017Applicants: Bridgestone Sports Co., Ltd., BRIDGESTONE CORPORATIONInventors: Tsuyoshi NAKAJIMA, Yuichiro OZAWA, Daisuke NAKAJIMA
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Publication number: 20170368427Abstract: A method of manufacturing golf balls having a core and a cover of at least one layer encasing the core includes the steps of producing a core by molding and vulcanizing a rubber composition containing (A) a base rubber, (B) an ?,?-unsaturated carboxylic acid and/or a metal salt thereof, and (C) an organic peroxide; and heat-treating the core for 1 to 24 hours at between 175 and 300° C. Golf balls which undergo little energy loss and have a high initial velocity can be obtained by this method.Type: ApplicationFiled: June 20, 2017Publication date: December 28, 2017Applicants: Bridgestone Sports Co., Ltd., BRIDGESTONE CORPORATIONInventors: Tsuyoshi NAKAJIMA, Yuichiro OZAWA, Daisuke NAKAJIMA
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Publication number: 20170282017Abstract: The invention provides a golf ball having a core and a cover of one layer or a plurality of layers, wherein the core is formed of a material molded under heat from a rubber composition containing (A) a base rubber, (B) an organic peroxide, and (C) water and/or a metal monocarboxylate, and has a hysteresis loss of 50% or less when compressed at a load cell speed of 500 mm/min and under a constant load of 5,000 N.Type: ApplicationFiled: June 16, 2017Publication date: October 5, 2017Applicant: Bridgestone Sports Co., Ltd.Inventors: Kae YAMAZAKI, Tsuyoshi NAKAJIMA, Yuichiro OZAWA
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Publication number: 20170282016Abstract: The invention provides a golf ball having a core and a cover of one layer or a plurality of layers, the core being formed of a material molded under heat from a rubber composition which includes (A) a base rubber, (B) an organic peroxide, and (C) water and/or a metal monocarboxylate. The product P×E of the difference P (mol/m3) in crosslink density between the core surface and the core center, as measured based on a toluene swelling test, multiplied by the deflection E (mm) of the core when compressed under a final load of 1,275 N (130 kgf) from an initial load state of 98 N (10 kgf) is at least 28×102 mol/m3·mm.Type: ApplicationFiled: June 15, 2017Publication date: October 5, 2017Applicant: Bridgestone Sports Co., Ltd.Inventors: Tsuyoshi NAKAJIMA, Yuichiro OZAWA
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Patent number: 9764196Abstract: The invention provides a golf ball having a core and a cover of one layer or a plurality of layers, the core being formed of a material molded under heat from a rubber composition which includes (A) a base rubber, (B) an organic peroxide, and (C) water and/or a metal monocarboxylate. The product P×E of the difference P (mol/m3) in crosslink density between the core surface and the core center, as measured based on a toluene swelling test, multiplied by the deflection E (mm) of the core when compressed under a final load of 1,275 N (130 kgf) from an initial load state of 98 N (10 kgf) is at least 28×102 mol/m3·mm.Type: GrantFiled: November 6, 2015Date of Patent: September 19, 2017Assignee: Bridgestone Sports Co., Ltd.Inventors: Tsuyoshi Nakajima, Yuichiro Ozawa
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Publication number: 20170225042Abstract: Golf ball having a core and a cover of one or more layers, the core being formed of a material molded under heat from a rubber composition including a base rubber, an organic peroxide, and water and/or a metal monocarboxylate. Defining the tan ? slope as (tan ?10?tan ?1)/(10%?1%), where tan ?1 and tan ?10 are the loss tangents at dynamic strains of, respectively, 1% and 10% when the loss tangents of the core center and the core surface are measured at ?12° C. and 15 Hz, the difference between the tan ? slopes at the core surface and the core center is larger than 0.002. Because a core material which undergoes little decrease in resilience over time and experiences little energy loss can be obtained, the golf ball maintains a good rebound, has a reduced spin rate and thus is able to achieve an increased distance.Type: ApplicationFiled: April 24, 2017Publication date: August 10, 2017Applicant: Bridgestone Sports Co., Ltd.Inventors: Tsuyoshi NAKAJIMA, Yuichiro OZAWA
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Patent number: 9724568Abstract: The invention provides a golf ball having a core and a cover of one layer or a plurality of layers, wherein the core is formed of a material molded under heat from a rubber composition containing (A) a base rubber, (B) an organic peroxide, and (C) water and/or a metal monocarboxylate, and has a hysteresis loss of 50% or less when compressed at a load cell speed of 500 mm/min and under a constant load of 5,000 N.Type: GrantFiled: December 30, 2015Date of Patent: August 8, 2017Assignee: Bridgestone Sports Co., Ltd.Inventors: Kae Yamazaki, Tsuyoshi Nakajima, Yuichiro Ozawa
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Patent number: 9675845Abstract: Golf ball having a core and a cover of one or more layers, the core being formed of a material molded under heat from a rubber composition including a base rubber, an organic peroxide, and water and/or a metal monocarboxylate. Defining the tan ? slope as (tan ?10?tan ?1)/(10%?1%), where tan ?1 and tan ?10 are the loss tangents at dynamic strains of, respectively, 1% and 10% when the loss tangents of the core center and the core surface are measured at ?12° C. and 15 Hz, the difference between the tan ? slopes at the core surface and the core center is larger than 0.002. Because a core material which undergoes little decrease in resilience over time and experiences little energy loss can be obtained, the golf ball maintains a good rebound, has a reduced spin rate and thus is able to achieve an increased distance.Type: GrantFiled: December 8, 2015Date of Patent: June 13, 2017Assignee: Bridgestone Sports Co., Ltd.Inventors: Tsuyoshi Nakajima, Yuichiro Ozawa
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Publication number: 20160199701Abstract: The invention provides a golf ball having a core and a cover of one layer or a plurality of layers, the core being formed of a material molded under heat from a rubber composition containing: (A) a base rubber, (B) an organic peroxide, and (C) water and/or a metal monocarboxylate. The core has a hardness profile which satisfies specific relationships between the JIS-C hardness at the core center (Cc), the JIS-C hardness at a position 10 mm from the core center (C10) and the JIS-C hardness at the core surface (Cs).Type: ApplicationFiled: December 18, 2015Publication date: July 14, 2016Applicant: Bridgestone Sports Co., Ltd.Inventors: Hideo WATANABE, Tsuyoshi NAKAJIMA, Yuichiro OZAWA
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Publication number: 20160184655Abstract: The invention provides a golf ball having a core and a cover of one layer or a plurality of layers, wherein the core is formed of a material molded under heat from a rubber composition containing (A) a base rubber, (B) an organic peroxide, and (C) water and/or a metal monocarboxylate, and has a hysteresis loss of 50% or less when compressed at a load cell speed of 500 mm/min and under a constant load of 5,000 N.Type: ApplicationFiled: December 30, 2015Publication date: June 30, 2016Applicant: Bridgestone Sports Co., Ltd.Inventors: Kae YAMAZAKI, Tsuyoshi NAKAJIMA, Yuichiro OZAWA
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Publication number: 20160166887Abstract: Golf ball having a core and a cover of one or more layers, the core being formed of a material molded under heat from a rubber composition including a base rubber, an organic peroxide, and water and/or a metal monocarboxylate. Defining the tan ? slope as (tan ?10?tan ?1)/(10%?1%), where tan ?1 and tan ?10 are the loss tangents at dynamic strains of, respectively, 1% and 10% when the loss tangents of the core center and the core surface are measured at ?12° C. and 15 Hz, the difference between the tan ? slopes at the core surface and the core center is larger than 0.002. Because a core material which undergoes little decrease in resilience over time and experiences little energy loss can be obtained, the golf ball maintains a good rebound, has a reduced spin rate and thus is able to achieve an increased distance.Type: ApplicationFiled: December 8, 2015Publication date: June 16, 2016Applicant: BRIDGESTONE SPORTS CO., LTD.Inventors: Tsuyoshi NAKAJIMA, Yuichiro OZAWA