Patents by Inventor Noriaki Hitomi
Noriaki Hitomi 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: 8277692Abstract: The semiconductive rubber composition according to the present invention contains: a rubber content containing at least copolymer rubber containing ethylene oxide as a copolymeric component and chloroprene rubber; and not less than 0.5 parts by mass and not more than 1.5 parts by mass of a thiourea-based vulcanization accelerator, not less than 0.5 parts by mass and not more than 1.5 parts by mass of a guanidine-based vulcanization accelerator and not less than 0.5 parts by mass and not more than 2.0 parts by mass of a peroxide-based crosslinking agent with respect to 100 parts by mass of the sum of the rubber content.Type: GrantFiled: February 4, 2010Date of Patent: October 2, 2012Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Takashi Marui, Yoshihisa Mizumoto, Kei Tajima, Noriaki Hitomi
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Patent number: 8211000Abstract: A conductive roller has a core and a conductive foam formed on a peripheral surface thereof. The conductive foam constitutes a three-phase rubber composition containing 35 to 50 parts by mass of epichlorohydrin rubber, 25 to 35 parts by mass of ethylene-propylene-diene copolymer rubber, and 25 to 30 parts by mass of acrylonitrile-butadiene rubber as a rubber component thereof. The conductive foam does not have a coating layer formed on a surface thereof. The conductive roller has an Asker C hardness, an electric resistance value, an average surface-cell diameter, and a number of surface cells set to 30 to 36°, 106 to 107?, 100 to 200 ?m, and 50 to 120/1.5 mm square respectively.Type: GrantFiled: August 17, 2009Date of Patent: July 3, 2012Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Takashi Marui, Takeshi Ishimaru, Noriaki Hitomi
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Conductive roller which is mounted on an image-forming mechanism of an electrophotographic apparatus
Patent number: 8023869Abstract: The present invention provides a conductive roller whose outermost layer is made of a vulcanized rubber composition. The vulcanized rubber composition contains epichlorohydrin rubber and chloroprene rubber as a rubber component thereof and 0.2 to 5 parts by mass of each of a thiourea-based vulcanizing agent and a vulcanization retarder consisting of N-(cyclohexylthio)phthalimide for 100 parts by mass of the rubber component.Type: GrantFiled: October 16, 2009Date of Patent: September 20, 2011Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Yoshihisa Mizumoto, Masakazu Tanaka, Takashi Marui, Hideyuki Okuyama, Noriaki Hitomi -
Patent number: 7869749Abstract: A semiconductive rubber roller comprising a toner-transporting portion whose outermost layer is formed essentially of vulcanized rubber containing 0.1 to 30 parts by mass of a phthalocyanine compound for 100 parts by mass of the vulcanized rubber. An electric resistance value of the semiconductive rubber roller which is measured at a temperature of 23° C. and a humidity of 55% is in a range of 103 to 109?, when a voltage of 100V is applied thereto.Type: GrantFiled: October 26, 2007Date of Patent: January 11, 2011Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Yoshihisa Mizumoto, Noriaki Hitomi, Hirotoshi Murakami, Yajun Zhang
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Publication number: 20100200814Abstract: The semiconductive rubber composition according to the present invention contains: a rubber content containing at least copolymer rubber containing ethylene oxide as a copolymeric component and chloroprene rubber; and not less than 0.5 parts by mass and not more than 1.5 parts by mass of a thiourea-based vulcanization accelerator, not less than 0.5 parts by mass and not more than 1.5 parts by mass of a guanidine-based vulcanization accelerator and not less than 0.5 parts by mass and not more than 2.0 parts by mass of a peroxide-based crosslinking agent with respect to 100 parts by mass of the sum of the rubber content.Type: ApplicationFiled: February 4, 2010Publication date: August 12, 2010Inventors: Takashi MARUI, Yoshihisa Mizumoto, Kei Tajima, Noriaki Hitomi
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Publication number: 20100172675Abstract: The present invention provides a conductive roller whose outermost layer is made of a vulcanized rubber composition. The vulcanized rubber composition contains epichlorohydrin rubber and chloroprene rubber as a rubber component thereof and 0.2 to 5 parts by mass of each of a thiourea-based vulcanizing agent and a vulcanization retarder consisting of N-(cyclohexylthio)phthalimide for 100 parts by mass of the rubber component.Type: ApplicationFiled: October 16, 2009Publication date: July 8, 2010Inventors: Yoshihisa MIZUMOTO, Masakazu Tanaka, Takashi Marui, Hideyuki Okuyama, Noriaki Hitomi
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Publication number: 20100069208Abstract: The present invention provides a conductive roller having a core and a conductive foam formed on a peripheral surface thereof. The conductive foam consists of a three-phase rubber composition containing 35 to 50 parts by mass of epichlorohydrin rubber, 25 to 35 parts by mass of ethylene-propylene-diene copolymer rubber, and 25 to 30 parts by mass of acrylonitrile-butadiene rubber as a rubber component thereof. The conductive foam does not have a coating layer formed on a surface thereof. The conductive roller has an Asker C hardness, an electric resistance value, an average surface-cell diameter, and a number of surface cells set to 30 to 36°, 106 to 107 ?, 100 to 200 ?m, and 50 to 120/1.5 mm square respectively.Type: ApplicationFiled: August 17, 2009Publication date: March 18, 2010Inventors: Takashi MARUI, Takeshi Ishimaru, Noriaki Hitomi
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Publication number: 20090233776Abstract: A conductive roller comprising a toner-transporting portion, made of a vulcanized rubber composition, which is disposed at least on an outermost layer thereof. The vulcanized rubber composition contains a rubber component (A) mixed with a weakly conductive carbon black (B) having a large particle diameter not less than 80 nm nor more than 500 nm, a highly conductive carbon black (C) having a small particle diameter not less than 18 nm nor more than 80 nm, and an inorganic filler (D) consisting of not less than one kind of a metal oxide selected from among a group of titanium oxide, alumina, and silica. The total of a mixing amount of the weakly conductive carbon black (B), that of the highly conductive carbon black (C), and that of the inorganic filler (D) for 100 parts by mass of the rubber component (A) is not less than 15 parts by mass nor more than 60 parts by mass.Type: ApplicationFiled: March 13, 2009Publication date: September 17, 2009Applicant: Sumito Rubber Industries, Ltd.Inventors: Yoshihisa Mizumoto, Noriaki Hitomi, Hirotoshi Murakami, Yajun Zhang
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Publication number: 20080299483Abstract: The present invention provides a method for recycling a spent image-forming member mounted inside an image-forming apparatus to reuse the image-forming member. In the method, the image-forming member is made of an elastomer before the image-forming member is recycled; and when a recycling work is performed, a surface of the image-forming member is not abraded, but irradiated with ultraviolet rays or ozone at least once to decompose or/and deteriorate a deposit which has attached to the surface thereof in a use thereof so that the deposit is removed from the surface thereof.Type: ApplicationFiled: May 5, 2008Publication date: December 4, 2008Inventors: Yoshihisa Mizumoto, Noriaki Hitomi
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Patent number: 7448610Abstract: A paper-feeding roller (3) including a core (2) and a rubber roll (1) mounted on a peripheral surface of the core (2). The rubber roll (1) has a three-layer construction composed of an inner layer (11), an intermediate layer (12), and an outer layer (13). The inner layer (11), the intermediate layer (12), and the outer layer (13) are a non-foamed layer respectively. The JIS-A hardness of the inner layer (11) is set to not more than 10 degrees. The JIS-A hardness of the outer layer (13) is set to a range of 25 to 60 degrees.Type: GrantFiled: September 9, 2005Date of Patent: November 11, 2008Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Yasuchika Ito, Hirokazu Nishimori, Takeshi Ishimaru, Noriaki Hitomi
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Publication number: 20080107456Abstract: A semiconductive rubber roller comprising a toner-transporting portion whose outermost layer is formed essentially of vulcanized rubber containing 0.1 to 30 parts by mass of a phthalocyanine compound for 100 parts by mass of the vulcanized rubber. An electric resistance value of the semiconductive rubber roller which is measured at a temperature of 23° C. and a humidity of 55% is in a range of 103 to 109?, when a voltage of 100V is applied thereto.Type: ApplicationFiled: October 26, 2007Publication date: May 8, 2008Applicant: Sumitomo Rubber Industries, Ltd.Inventors: Yoshihisa Mizumoto, Noriaki Hitomi, Hirotoshi Murakami, Yajun Zhang
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Publication number: 20070041752Abstract: A semiconductive roller comprising a toner-transporting portion whose outermost layer is formed essentially of resin or rubber, wherein the resin or the rubber includes resin or rubber having chlorine atoms and 3 to 60 parts by mass of titanium oxide for 100 parts by mass of the resin or the rubber having the chlorine atoms.Type: ApplicationFiled: July 31, 2006Publication date: February 22, 2007Inventors: Yoshihisa Mizumoto, Noriaki Hitomi, Hirotoshi Murakami, Zhang Yajun
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Publication number: 20060082042Abstract: A paper-feeding roller (3) including a core (2) and a rubber roll (1) mounted on a peripheral surface of the core (2). The rubber roll (1) has a three-layer construction composed of an inner layer (11), an intermediate layer (12), and an outer layer (13). The inner layer (11), the intermediate layer (12), and the outer layer (13) are a non-foamed layer respectively. The JIS-A hardness of the inner layer (11) is set to not more than 10 degrees. The JIS-A hardness of the outer layer (13) is set to a range of 25 to 60 degrees.Type: ApplicationFiled: September 9, 2005Publication date: April 20, 2006Inventors: Yasuchika Ito, Hirokazu Nishimori, Takeshi Ishimaru, Noriaki Hitomi