Patents by Inventor Mitsuharu Akiyama
Mitsuharu Akiyama 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: 9593445Abstract: A reinforcing cord for rubber reinforcement of the present invention that is used for reinforcing a rubber product is provided with a plurality of strands. The strand includes bundled fibers and a coating layer formed so as to cover the bundled fibers. The plurality of strands are in tight contact with one another via the coating layer. The coating layer contains a material that is crosslinkable by thermal treatment. A method of manufacturing the reinforcing cord for rubber reinforcement includes the steps of (i) forming strands that include bundled fibers and a coating layer formed so as to cover the bundled fibers, and (ii) bringing the strands into tight contact with one another via the coating layer by twisting the strands together. The coating layer contains a material that is crosslinkable by thermal treatment.Type: GrantFiled: June 24, 2005Date of Patent: March 14, 2017Assignee: NIPPON SHEET GLASS COMPANY, LIMITEDInventors: Mitsuharu Akiyama, Naoya Mizukoshi, Keisuke Kajihara
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Patent number: 8962129Abstract: A rubber-reinforcing cord (12) as a rubber-reinforcing member of the present invention is a rubber-reinforcing member for reinforcing a rubber product (such as a toothed belt (1)). The rubber-reinforcing cord (12) includes a reinforcing fiber or a reinforcing fiber sheet, and a first coating film provided on a surface of the reinforcing fiber or a surface of the reinforcing fiber sheet. The first coating film is formed by applying a first treatment agent containing polyvinyl alcohol and a crosslinking agent to the reinforcing fiber or the reinforcing fiber sheet and drying the first treatment agent. In the reinforcing member of the present invention, a second coating film as a primary coating film may be provided on the surface of the reinforcing fiber or the surface of the reinforcing fiber sheet. The second coating film can be produced using a second treatment agent containing a rubber latex, for example.Type: GrantFiled: May 22, 2008Date of Patent: February 24, 2015Assignee: Nippon Sheet Glass Company, LimitedInventors: Nobuaki Tai, Mitsuharu Akiyama
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Patent number: 8222328Abstract: A method of manufacturing of the present invention is a method of manufacturing a toothed belt (10) having a belt part (13) and a tooth part (14) sticking out of the belt part (13). This method of manufacturing includes a first step of forming a reinforcing-sheet (12) including a fiber sheet and a coating film formed on the fiber sheet by drying the fiber sheet on which an aqueous treatment agent containing a first rubber latex and a first vulcanizing agent is applied, and a second step of reinforcing a surface of the tooth part (14) with the reinforcing-sheet (12) by vulcanizing the first rubber and a second rubber at the same time while adhering a rubber composition, which is a material for the tooth part (14), including the second rubber and a second vulcanizing agent to the reinforcing-sheet (12). The aqueous treatment agent contains the vulcanizing agent in the range of 10 parts by weight to 100 parts by weight for 100 parts by weight of the first rubber.Type: GrantFiled: July 14, 2008Date of Patent: July 17, 2012Assignee: Nippon Sheet Glass Company, LimitedInventors: Mitsuharu Akiyama, Naoya Mizukoshi
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Patent number: 7814740Abstract: A cord for rubber reinforcement of the present invention includes a core strand including a plurality of strands (A), and a plurality of strands (B) disposed around the core strand. In the core strand, the plurality of strands (A) are finally twisted, and each of the plurality of strands (A) is formed of a plurality of reinforcing fibers (A) that are primarily twisted. Each of the plurality of strands (B) is formed of a plurality of reinforcing fibers (B) that are primarily twisted, and the plurality of strands (B) are finally twisted to be disposed around the core strand. The direction of final twist of the plurality of strands (B) is the same as the direction of primary twist in at least one strand (B) selected from the plurality of strands (B). The number of primary twists in the strand (B) is greater than the number of primary twists in the strand (A), and/or the number of final twists of the strands (B) is greater than the number of final twists of the strands (A).Type: GrantFiled: November 8, 2006Date of Patent: October 19, 2010Assignee: Nippon Sheet Glass Company, LimitedInventors: Hideki Imanishi, Mitsuharu Akiyama, Hiroshi Iizuka
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Publication number: 20100221520Abstract: A rubber-reinforcing cord (12) as a rubber-reinforcing member of the present invention is a rubber-reinforcing member for reinforcing a rubber product (such as a toothed belt (1)). The rubber-reinforcing cord (12) includes a reinforcing fiber or a reinforcing fiber sheet, and a first coating film provided on a surface of the reinforcing fiber or a surface of the reinforcing fiber sheet. The first coating film is formed by applying a first treatment agent containing polyvinyl alcohol and a crosslinking agent to the reinforcing fiber or the reinforcing fiber sheet and drying the first treatment agent. In the reinforcing member of the present invention, a second coating film as a primary coating film may be provided on the surface of the reinforcing fiber or the surface of the reinforcing fiber sheet. The second coating film can be produced using a second treatment agent containing a rubber latex, for example.Type: ApplicationFiled: May 22, 2008Publication date: September 2, 2010Applicant: NIPPON SHEET GLASS COMPANY, LIMITEDInventors: Nobuaki Tai, Mitsuharu Akiyama
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Patent number: 7770427Abstract: A method for producing a metal forged product having a plurality of branches includes a preliminary forging step of forming a preform by closed forging from a cylindrical material (301) having a surface layer (302) on a circumferential surface thereof such that the surface layer is contained in a surface region of the preform; an intermediate forging step of subjecting the preform to forging to thereby extrude the surface layer in the form of flash outside a periphery of a forged product corresponding to a target product; a final forging step of forging the forged product into a product assuming a target product shape; and a flash removal step of removing the flash containing the surface layer from the product assuming a target product shape to thereby produce a target forged product. The forged product is enhanced in mechanical characteristics and has no flash removal mark.Type: GrantFiled: February 18, 2004Date of Patent: August 10, 2010Assignee: Showa Denko K.K.Inventors: Takafumi Nakahara, Mitsuharu Akiyama
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Patent number: 7682274Abstract: A reinforcing cord of the present invention is a reinforcing cord for rubber reinforcement. The reinforcing cord includes a carbon fiber strand (11) and a plurality of glass fiber strands (12) arranged around the carbon fiber strand (11). The present invention makes it possible to obtain a reinforcing cord having sufficient tensile strength for reinforcing rubber products as well as high dimensional stability and bending fatigue resistance.Type: GrantFiled: April 7, 2004Date of Patent: March 23, 2010Assignee: Nippon Sheet Glass Company, LimitedInventors: Mitsuharu Akiyama, Keisuke Kajihara
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Publication number: 20090229237Abstract: A cord for rubber reinforcement of the present invention includes a core strand including a plurality of strands (A), and a plurality of strands (B) disposed around the core strand. In the core strand, the plurality of strands (A) are finally twisted, and each of the plurality of strands (A) is formed of a plurality of reinforcing fibers (A) that are primarily twisted. Each of the plurality of strands (B) is formed of a plurality of reinforcing fibers (B) that are primarily twisted, and the plurality of strands (B) are finally twisted to be disposed around the core strand. The direction of final twist of the plurality of strands (B) is the same as the direction of primary twist in at least one strand (B) selected from the plurality of strands (B). The number of primary twists in the strand (B) is greater than the number of primary twists in the strand (A), and/or the number of final twists of the strands (B) is greater than the number of final twists of the strands (A).Type: ApplicationFiled: November 8, 2006Publication date: September 17, 2009Inventors: Hideki Imanishi, Mitsuharu Akiyama, Hiroshi Iizuka
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Publication number: 20090075079Abstract: A reinforcing cord 10 for rubber reinforcement of the present invention includes a reinforcing fiber 11. A coating film 12 is formed on a surface of the reinforcing fiber 11. The coating film 12 includes, as its main components, a rubber having acrylonitrile as one of its raw materials and a compound containing an oxazoline group. A method of manufacturing a reinforcing cord for rubber reinforcement of the present invention includes (i) applying an aqueous mixture including, as its main components, a rubber latex having acrylonitrile as one of its raw materials and a compound containing an oxazoline group onto a reinforcing fiber, and (ii) drying the applied aqueous mixture to form a coating film on the surface of the reinforcing fiber.Type: ApplicationFiled: November 10, 2005Publication date: March 19, 2009Applicant: Nippon Sheet Glass Company, LimitedInventors: Hideki Imanishi, Keisuke Kajihara, Mitsuharu Akiyama
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Publication number: 20080271638Abstract: A method of manufacturing of the present invention is a method of manufacturing a toothed belt (10) having a belt part (13) and a tooth part (14) sticking out of the belt part (13). This method of manufacturing includes a first step of forming a reinforcing-sheet (12) including a fiber sheet and a coating film formed on the fiber sheet by drying the fiber sheet on which an aqueous treatment agent containing a first rubber latex and a first vulcanizing agent is applied, and a second step of reinforcing a surface of the tooth part (14) with the reinforcing-sheet (12) by vulcanizing the first rubber and a second rubber at the same time while adhering a rubber composition, which is a material for the tooth part (14), including the second rubber and a second vulcanizing agent to the reinforcing-sheet (12). The aqueous treatment agent contains the vulcanizing agent in the range of 10 parts by weight to 100 parts by weight for 100 parts by weight of the first rubber.Type: ApplicationFiled: July 14, 2008Publication date: November 6, 2008Applicant: Nippon Sheet Glass Company, LimitedInventors: Mitsuharu Akiyama, Naoya Mizukoshi
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Patent number: 7404426Abstract: A hybrid cord 1 for rubber reinforcement comprises a strand 2 having higher elastic modulus, made of PBO fiber or the like, which is disposed at the center of the cord, and strands 3 having lower elastic modulus, made of glass fiber or the like, which are disposed therearound. The hybrid cord has enough strength and is excellent in flexural fatigue resistance, adhesion property relative to rubber, and dimensional stability. A rubber product employs this hybrid cord 1 for rubber reinforcement.Type: GrantFiled: June 15, 2004Date of Patent: July 29, 2008Assignee: Nippon Sheet Glass Co., Ltd.Inventors: Mitsuharu Akiyama, Takeshi Maeda, Yukinari Okuyama
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Publication number: 20080166576Abstract: A method of manufacturing of the present invention is a method of manufacturing a toothed belt (10) having a belt part (13) and a tooth part (14) sticking out of the belt part (13). This method of manufacturing includes a first step of forming a reinforcing-sheet (12) including a fiber sheet and a coating film formed on the fiber sheet by drying the fiber sheet on which an aqueous treatment agent containing a first rubber latex and a first vulcanizing agent is applied, and a second step of reinforcing a surface of the tooth part (14) with the reinforcing-sheet (12) by vulcanizing the first rubber and a second rubber at the same time while adhering a rubber composition, which is a material for the tooth part (14), including the second rubber and a second vulcanizing agent to the reinforcing-sheet (12). The aqueous treatment agent contains the vulcanizing agent in the range of 10 parts by weight to 100 parts by weight for 100 parts by weight of the first rubber.Type: ApplicationFiled: November 15, 2005Publication date: July 10, 2008Applicant: NIPPON SHEET GLASS COMPANY, LIMITEDInventors: Mitsuharu Akiyama, Naoya Mizukoshi
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Publication number: 20080032130Abstract: A reinforcing cord for rubber reinforcement of the present invention that is used for reinforcing a rubber product is provided with a plurality of strands. The strand includes bundled fibers and a coating layer formed so as to cover the bundled fibers. The plurality of strands are in tight contact with one another via the coating layer. The coating layer contains a material that is crosslinkable by thermal treatment. A method of manufacturing the reinforcing cord for rubber reinforcement includes the steps of (i) forming strands that include bundled fibers and a coating layer formed so as to cover the bundled fibers, and (ii) bringing the strands into tight contact with one another via the coating layer by twisting the strands together. The coating layer contains a material that is crosslinkable by thermal treatment.Type: ApplicationFiled: June 24, 2005Publication date: February 7, 2008Applicant: Nippon Sheet Glass Company. LimitedInventors: Mitsuharu Akiyama, Naoya Mizukoshi, Keisuke Kajihara
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Publication number: 20070098983Abstract: A reinforcing cord of the present invention is a reinforcing cord for rubber reinforcement. The reinforcing cord includes a carbon fiber strand (11) and a plurality of glass fiber strands (12) arranged around the carbon fiber strand (11). The present invention makes it possible to obtain a reinforcing cord having sufficient tensile strength for reinforcing rubber products as well as high dimensional stability and bending fatigue resistance.Type: ApplicationFiled: April 7, 2004Publication date: May 3, 2007Applicant: NIPPON SHEET GLASS COMPANY, LIMITEDInventors: Mitsuharu Akiyama, Keisuke Kajihara
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Publication number: 20060185416Abstract: A method for producing a metal forged product having a plurality of branches includes a preliminary forging step of forming a preform by closed forging from a cylindrical material (301) having a surface layer (302) on a circumferential surface thereof such that the surface layer is contained in a surface region of the preform; an intermediate forging step of subjecting the preform to forging to thereby extrude the surface layer in the form of flash outside a periphery of a forged product corresponding to a target product; a final forging step of forging the forged product into a product assuming a target product shape; and a flash removal step of removing the flash containing the surface layer from the product assuming a target product shape to thereby produce a target forged product. The forged product is enhanced in mechanical characteristics and has no flash removal mark.Type: ApplicationFiled: February 18, 2004Publication date: August 24, 2006Inventors: Takafumi Nakahara, Mitsuharu Akiyama
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Publication number: 20050091960Abstract: A rubber reinforcing cord having high flexural fatigue resistance and high dimensional stability is provided and a rubber product such as a rubber belt employing the cord is provided. The cord includes a fibrous core and a plurality of subsidiary strands which are disposed around the fibrous core and each of which is twisted by a primary twist, in which the fibrous core and the subsidiary strands are twisted together by a final twist. The direction of the primary twist of the subsidiary strands and the direction of the final twist are the same and the fibrous core is twisted by a primary twist in a direction opposite to the direction of the primary twist of the subsidiary strands. A rubber product is reinforced with the rubber reinforcing cord.Type: ApplicationFiled: November 30, 2004Publication date: May 5, 2005Applicant: NIPPON SHEET GLASS CO., LTD.Inventors: Mitsuharu Akiyama, Keisuke Kajihara
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Publication number: 20040226641Abstract: A hybrid cord 1 for rubber reinforcement comprises a strand 2 having higher elastic modulus, made of PBO fiber or the like, which is disposed at the center of the cord, and strands 3 having lower elastic modulus, made of glass fiber or the like, which are disposed therearound. The hybrid cord has enough strength and is excellent in flexural fatigue resistance, adhesion property relative to rubber, and dimensional stability. A rubber product employs this hybrid cord 1 for rubber reinforcement.Type: ApplicationFiled: June 15, 2004Publication date: November 18, 2004Applicant: NIPPON SHEET GLASS CO., LTD.Inventors: Mitsuharu Akiyama, Takeshi Maeda, Yukinari Okuyama
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Patent number: 6262154Abstract: A reinforcing fiber for a rubber product that has excellent heat resistance, water resistance and resistance to flex fatigue without undergoing a complicated production process and a treatment agent therefore. This treatment agent comprises a rubber latex, a resorcin-formaldehyde water-soluble condensate and triazine thiol.Type: GrantFiled: June 10, 1999Date of Patent: July 17, 2001Assignees: Nippon Sheet Glass Co., Ltd., Nippon Zeon Co., Ltd.Inventors: Akinobu Okamura, Takuo Hamaguchi, Mitsuharu Akiyama, Osamu Mori, Mitsugu Ishihara
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Patent number: 6106943Abstract: A reinforcing cord which strongly adheres to a mixed rubber comprising a hydrogenated acrylonitrile-butadiene rubber having excellent flex resistance and heat resistance and a hydrogenated acrylonitrile-butadiene rubber having dispersed therein zinc methacrylate, and a treating material for forming a coating layer on the cord. The reinforcing cord comprises a fiber for reinforcing a rubber, a first coating layer formed on the surface of the fiber, obtained by coating a treating material comprising a resorcin/formalin condensate and a rubber latex on the surface thereof, and a second coating layer formed on the first coating layer, obtained by coating another treating material comprising a rubber compound, a vulcanizing agent and one member selected from the group consisting of a silane coupling agent, a maleimide type vulcanization assistant and a dimethacrylate type vulcanization assistant.Type: GrantFiled: February 17, 1999Date of Patent: August 22, 2000Assignee: Nippon Sheet Glass Co., Ltd.Inventor: Mitsuharu Akiyama