Patents by Inventor Ryotaro Suefuji
Ryotaro Suefuji 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: 20240019050Abstract: A marine hose includes an inner reinforcing layer group a release layer, and an outer reinforcing layer group layered in order from an inner circumferential side between an inner surface rubber layer and a cover layer. The release layer is composed mainly of PVA and the water dissolution temperature is set to 50° C. or higher. When the inner surface rubber layer and the inner reinforcing layer group are damaged, the release layer is separated from the inner reinforcing layer group to form a gap therebetween. A fluid leaking from a flow path on an inner side of the inner surface rubber layer flows through the gap and a communication pipe and reaches a leak detector disposed on a hose surface.Type: ApplicationFiled: September 22, 2021Publication date: January 18, 2024Inventor: Ryotaro SUEFUJI
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Patent number: 10442624Abstract: The present technology provides a reinforcing layer for a rubber product. A reinforcing layer embedded in a conveyor belt is composed of a plurality of steel cords embedded so as to extend in the belt longitudinal direction side by side in parallel. The outer diameter of the steel cords is not less than 0.35 mm and not greater than 6.0 mm, and the side-by-side pitch is greater than 0.35 mm and not greater than 7.0 mm.Type: GrantFiled: May 11, 2016Date of Patent: October 15, 2019Assignee: The Yokohama Rubber Co., LTD.Inventors: Gang Hou, Ryotaro Suefuji
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Patent number: 10309041Abstract: A steel cord has a stranded structure comprising a plurality of sheath strands intertwined around the outer circumferential surface of a core strand; and a filament having a linear mass density of at least 560 dtex and not more than 2,200 dtex wrapped in a spiral around the outer circumferential surface of the core strand. The steel cord is embedded in an unvulcanized rubber member to mold a molded rubber article, which is then vulcanized.Type: GrantFiled: April 3, 2014Date of Patent: June 4, 2019Assignee: The Yokohama Rubber Co., LTD.Inventor: Ryotaro Suefuji
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Patent number: 10160600Abstract: The present technology provides a conveyor belt. An upper cover rubber and a lower cover rubber are respectively disposed above and below a core layer so as to sandwich the core layer, which core layer is composed of a plurality of steel cords extending side by side in parallel. The outer diameter of the steel cords is not less than 0.35 mm and not greater than 6.0 mm, and the side-by-side pitch P of the steel cords is greater than 0.35 mm and not greater than 7.0 mm. The steel cords are embedded extending in the longitudinal direction of the conveyor belt.Type: GrantFiled: May 11, 2016Date of Patent: December 25, 2018Assignee: The Yokohama Rubber Co., LTD.Inventors: Gang Hou, Ryotaro Suefuji, Atsushi Miyajima
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Publication number: 20180305129Abstract: The present technology provides a reinforcing layer for a rubber product. A reinforcing layer embedded in a conveyor belt is composed of a plurality of steel cords embedded so as to extend in the belt longitudinal direction side by side in parallel. The outer diameter of the steel cords is not less than 0.35 mm and not greater than 6.0 mm, and the side-by-side pitch is greater than 0.35 mm and not greater than 7.0 mm.Type: ApplicationFiled: May 11, 2016Publication date: October 25, 2018Inventors: Gang Hou, Ryotaro Suefuji
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Patent number: 10011428Abstract: A coating rubber composition for a conveyer belt, comprising 15 to 75 parts by mass of carbon black having a nitrogen adsorption specific surface area of 50 m2/g or less, 25 to 100 parts by mass of calcium carbonate and 40 parts or less by mass of an oil per 100 parts by mass of blended rubber comprising of natural rubber and at least one of either butadiene rubber or SBR. The above coating rubber composition for conveyer belts can improve not only the peel force which is a criterion of adhesiveness with the canvas cloth but also the power-saving capability of the conveyer belt while maintaining the durability thereof. Further, compounding of silica in an amount of 5 to 20 parts by mass can achieve a sufficient rubber attachability onto the canvas cloth when over-vulcanized, while maintaining the peel force when subjected to normal vulcanization.Type: GrantFiled: April 10, 2015Date of Patent: July 3, 2018Assignee: The Yokohama Rubber Co., Ltd.Inventors: Hidehiro Sasakuma, Ryotaro Suefuji, Gang Hou, Atsushi Miyajima
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Patent number: 9994995Abstract: Steel cords have a stranded structure in which a plurality of sheath strands is intertwined around the outer circumferential surface of a core strand. The outer circumferential surface of the core strand is covered by a cushioning material made of nonwoven fabric or a resin film.Type: GrantFiled: September 5, 2013Date of Patent: June 12, 2018Assignee: The Yokohama Rubber Co., LTD.Inventor: Ryotaro Suefuji
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Publication number: 20180148263Abstract: The present technology provides a conveyor belt. An upper cover rubber and a lower cover rubber are respectively disposed above and below a core layer so as to sandwich the core layer, which core layer is composed of a plurality of steel cords extending side by side in parallel. The outer diameter of the steel cords is not less than 0.35 mm and not greater than 6.0 mm, and the side-by-side pitch P of the steel cords is greater than 0.35 mm and not greater than 7.0 mm. The steel cords are embedded extending in the longitudinal direction of the conveyor belt.Type: ApplicationFiled: May 11, 2016Publication date: May 31, 2018Inventors: Gang Hou, Ryotaro Suefuji, Atsushi Miyajima
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Patent number: 9850069Abstract: The present technology provides a rubber composition containing: a diene-based rubber containing a natural rubber and a butadiene rubber; a carbon black 1; and a carbon black 2. A nitrogen adsorption specific surface area of the carbon black 1 is from 60 to 100 m2/g; a dibutyl phthalate oil absorption of the carbon black 1 is 120 cm3/100 g or less; a nitrogen adsorption specific surface area of the carbon black 2 is from 20 to 40 m2/g; a dibutyl phthalate oil absorption of the carbon black 2 is from 70 to 95 cm3/100 g; and a total amount of the carbon black 1 and the carbon black 2 being from 25 to 50 parts by mass per 100 parts by mass of the diene-based rubber.Type: GrantFiled: May 22, 2015Date of Patent: December 26, 2017Assignee: The Yokohama Rubber Co., LTD.Inventors: Hidehiro Sasakuma, Ryotaro Suefuji, Gang Hou, Atsushi Miyajima
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Patent number: 9828181Abstract: A rubber-reinforcing steel cord embedded in a rubber product has a stranded structure including a core strand, and a plurality of sheath strands intertwined around an outer circumferential surface of the core strand; wherein a lubricant is provided between wires that constitute the core strand.Type: GrantFiled: June 5, 2015Date of Patent: November 28, 2017Assignee: The Yokohama Rubber Co., LTD.Inventors: Gang Hou, Atsushi Miyajima, Ryotaro Suefuji, Hidehiro Sasakuma
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Patent number: 9783367Abstract: A conveyor belt includes a core layer disposed between an upper cover rubber layer and a lower cover rubber layer. The core layer is configured from a plurality of steel cords covered by cushioning rubber and arranged in parallel. The rubber that forms the lower cover rubber layer is a low loss rubber that has a loss factor tan? of 0.07 or less at a frequency of 10 Hz, 2% dynamic strain, and temperature of 20° C. The maximum thickness of the cushioning rubber is reduced to not more than ? the nominal diameter of the steel cords.Type: GrantFiled: August 23, 2013Date of Patent: October 10, 2017Assignee: The Yokohama Rubber Co., LTD.Inventors: Atsushi Miyajima, Ryotaro Suefuji, Hidehiro Sasakuma, Gang Hou
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Publication number: 20170197789Abstract: The present technology provides a rubber composition containing: a diene-based rubber containing a natural rubber and a butadiene rubber; a carbon black 1; and a carbon black 2. A nitrogen adsorption specific surface area of the carbon black 1 is from 60 to 100 m2/g; a dibutyl phthalate oil absorption of the carbon black 1 is 120 cm3/100 g or less; a nitrogen adsorption specific surface area of the carbon black 2 is from 20 to 40 m2/g; a dibutyl phthalate oil absorption of the carbon black 2 is from 70 to 95 cm3/100 g; and a total amount of the carbon black 1 and the carbon black 2 being from 25 to 50 parts by mass per 100 parts by mass of the diene-based rubber.Type: ApplicationFiled: May 22, 2015Publication date: July 13, 2017Applicant: The Yokohama Rubber Co., Ltd.Inventors: Hidehiro Sasakuma, Ryotaro Suefuji, Gang Hou, Atsushi Miyajima
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Publication number: 20170043954Abstract: A coating rubber composition for a conveyer belt, comprising 15 to 75 parts by mass of carbon black having a nitrogen adsorption specific surface area of 50 m2/g or less, 25 to 100 parts by mass of calcium carbonate and 40 parts or less by mass of an oil per 100 parts by mass of blended rubber comprising of natural rubber and at least one of either butadiene rubber or SBR. The above coating rubber composition for conveyer belts can improve not only the peel force which is a criterion of adhesiveness with the canvas cloth but also the power-saving capability of the conveyer belt while maintaining the durability thereof. Further, compounding of silica in an amount of 5 to 20 parts by mass can achieve a sufficient rubber attachability onto the canvas cloth when over-vulcanized, while maintaining the peel force when subjected to normal vulcanization.Type: ApplicationFiled: April 10, 2015Publication date: February 16, 2017Applicant: The Yokohama Rubber Co., Ltd.Inventors: Hidehiro Sasakuma, Ryotaro Suefuji, Gang Hou, Atsushi Miyajima
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Patent number: 9403643Abstract: The present technology provides a rubber composition for a conveyor belt. The rubber composition comprises: a rubber component containing butadiene rubber and/or styrene butadiene rubber, carbon black, sulfur, and a vulcanization accelerator; the glass transition temperature of the butadiene rubber and the styrene butadiene rubber being ?65° C. or lower; the nitrogen adsorption specific surface area of the carbon black being 90 m2/g or less; the total content of the butadiene rubber and the styrene butadiene rubber being 50% by mass or greater relative to the content of the rubber component; the content of the carbon black being from 30 to 50 parts by mass per 100 parts by mass of the rubber component; and the mass ratio (sulfur/vulcanization accelerator) of the content of the sulfur to the content of the vulcanization accelerator being 1.5 or less.Type: GrantFiled: April 8, 2014Date of Patent: August 2, 2016Assignee: The Yokohama Rubber Co., LTD.Inventors: Hidehiro Sasakuma, Ryotaro Suefuji, Atsushi Miyajima, Gang Hou
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Publication number: 20160201259Abstract: A steel cord has a stranded structure comprising a plurality of sheath strands intertwined around the outer circumferential surface of a core strand; and a filament having a linear mass density of at least 560 dtex and not more than 2,200 dtex wrapped in a spiral around the outer circumferential surface of the core strand. The steel cord is embedded in an unvulcanized rubber member to mold a molded rubber article, which is then vulcanized.Type: ApplicationFiled: April 3, 2014Publication date: July 14, 2016Inventor: Ryotaro Suefuji
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Patent number: 9352906Abstract: Provided is a rubber-reinforcing steel cord that has superior productivity and is advantageous in reducing weight and improving bending resistance, as well as a conveyor belt that uses the rubber-reinforcing steel cord. A rubber-reinforcing steel cord 1 having a 1+6+(6+6) structure formed by twisting individual steel wires 2, 3, 4a, and 4b once in the same direction, a twist multiple of at least 9 and not greater than 14, and an outer diameter of not greater than 4 mm is used by being embedded in a rubber product.Type: GrantFiled: September 6, 2013Date of Patent: May 31, 2016Assignee: The Yokohama Rubber Co., LTD.Inventor: Ryotaro Suefuji
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Publication number: 20160096684Abstract: The present technology provides a rubber composition for a conveyor belt. The rubber composition comprises: a rubber component containing butadiene rubber and/or styrene butadiene rubber, carbon black, sulfur, and a vulcanization accelerator; the glass transition temperature of the butadiene rubber and the styrene butadiene rubber being ?65° C. or lower; the nitrogen adsorption specific surface area of the carbon black being 90 m2/g or less; the total content of the butadiene rubber and the styrene butadiene rubber being 50% by mass or greater relative to the content of the rubber component; the content of the carbon black being from 30 to 50 parts by mass per 100 parts by mass of the rubber component; and the mass ratio (sulfur/vulcanization accelerator) of the content of the sulfur to the content of the vulcanization accelerator being 1.5 or less.Type: ApplicationFiled: April 8, 2014Publication date: April 7, 2016Inventors: Hidehiro Sasakuma, Ryotaro Suefuji, Atsushi Miyajima, Gang Hou
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Publication number: 20150246775Abstract: Provided is a rubber-reinforcing steel cord that has superior productivity and is advantageous in reducing weight and improving bending resistance, as well as a conveyor belt that uses the rubber-reinforcing steel cord. A rubber-reinforcing steel cord 1 having a 1+6+(6+6) structure formed by twisting individual steel wires 2, 3, 4a, and 4b once in the same direction, a twist multiple of at least 9 and not greater than 14, and an outer diameter of not greater than 4 mm is used by being embedded in a rubber product.Type: ApplicationFiled: September 6, 2013Publication date: September 3, 2015Inventor: Ryotaro Suefuji
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Publication number: 20150232276Abstract: A conveyor belt includes a core layer disposed between an upper cover rubber layer and a lower cover rubber layer. The core layer is configured from a plurality of steel cords covered by cushioning rubber and arranged in parallel. The rubber that forms the lower cover rubber layer is a low loss rubber that has a loss factor tan? of 0.07 or less at a frequency of 10 Hz, 2% dynamic strain, and temperature of 20° C. The maximum thickness of the cushioning rubber is reduced to not more than ? the nominal diameter of the steel cords.Type: ApplicationFiled: August 23, 2013Publication date: August 20, 2015Inventors: Atsushi Miyajima, Ryotaro Suefuji, Hidehiro Sasakuma, Gang Hou
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Publication number: 20150211176Abstract: Steel cords have a stranded structure in which a plurality of sheath strands is intertwined around the outer circumferential surface of a core strand. The outer circumferential surface of the core strand is covered by a cushioning material made of nonwoven fabric or a resin film.Type: ApplicationFiled: September 5, 2013Publication date: July 30, 2015Inventor: Ryotaro Suefuji