Patents by Inventor Koyo Murakami
Koyo Murakami 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: 7150294Abstract: A fuel cell hose which is superior in flexibility (low-temperature flexing property) and in barrier properties against hydrogen gas or water, and causes no defects such as buckling or cracking when press-fitting of a connector. The hose comprises an inner layer 1 in contact with fluid and an outer layer 3 formed on an outer peripheral surface of the inner layer, the inner layer being formed by a material (A) comprising a polyolefin resin and a styrene-isobutylene block copolymer and the outer layer being formed by a material (B) comprising a polyamide resin and a styrene-isobutylene block copolymer.Type: GrantFiled: January 28, 2005Date of Patent: December 19, 2006Assignee: Tokai Rubber Industries, Ltd.Inventors: Kazutaka Katayama, Koyo Murakami
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Publication number: 20050189030Abstract: A fuel cell hose which is superior in flexibility (low-temperature flexing property) and in barrier properties against hydrogen gas or water, and causes no defects such as buckling or cracking when press-fitting of a connector. The hose comprises an inner layer 1 in contact with fluid and an outer layer 3 formed on an outer peripheral surface of the inner layer, the inner layer being formed by a material (A) comprising a polyolefin resin and a styrene-isobutylene block copolymer and the outer layer being formed by a material (B) comprising a polyamide resin and a styrene-isobutylene block copolymer.Type: ApplicationFiled: January 28, 2005Publication date: September 1, 2005Applicant: TOKAI RUBBER INDUSTRIES, LTD.Inventors: Kazutaka Katayama, Koyo Murakami
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Publication number: 20040155459Abstract: A first adapter is configured so as to include a cylindrical body. The cylindrical body of the first adapter is formed with a tube connecting portion on one axial side thereof and a hose connecting portion on an opposite axial side thereof. A first resin tube is connected to the tube connecting portion. A rubber hose is fitted on the hose connecting portion of the first adapter so as to overlap a connecting end portion of the first resin tube. And then a tightening band is tighten around an outer periphery of the rubber hose on the tube connecting portion.Type: ApplicationFiled: December 23, 2003Publication date: August 12, 2004Inventors: Kazutaka Katayama, Takahiro Nishiyama, Koyo Murakami
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Patent number: 6602565Abstract: A method of producing a fuel hose having superior adhesive reliability with superior initial adhesive strength between a tubular fluororesin inner layer and a thermoplastic resin outer layer and with restrained deterioration in adhesive strength after heat aging and immersion into fuel under severe conditions such as an inside of an engine compartment. The method includes plasma treatment on a peripheral surface of the tubular fluororesin inner layer, at least one treatment of water treatment and silane coupling agent treatment on the plasma treated surface and formation of the thermoplastic resin outer layer on the treated peripheral surface.Type: GrantFiled: August 6, 1999Date of Patent: August 5, 2003Assignee: Tokai Rubber Industries, Ltd.Inventors: Kazutaka Katayama, Hiroaki Ito, Takahiro Nishiyama, Koyo Murakami, Tomonori Hayakawa
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Patent number: 6267148Abstract: A conductive polyamide resin composition containing 6-15 parts of conductive carbon black and 0.3-5 parts of secondary aromatic amines for 100 parts by weight of polyamide resins is excellent in formability and a tube manufactured using the composition is excellent in conductivity, heat-aging resistance and oxygenated-gasoline resistance as well.Type: GrantFiled: December 14, 1998Date of Patent: July 31, 2001Assignee: Tokai Rubber Industries, Ltd.Inventors: Kazutaka Katayama, Hiroaki Itoh, Koyo Murakami
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Patent number: 5919326Abstract: The fuel hose of this invention is a fuel hose comprising a tubular fluororesin inner ply and, as laminated onto the peripheral surface thereof, a thermoplastic resin or rubber outer ply, the tubular fluororesin inner ply having been molded from a fluororesin with an F/C ratio, i.e. ratio of the number of fluorine atoms (F) to the number of carbon atoms (C), of not greater than 1.6 and the peripheral surface layer of the fluororesin inner ply having been modified into the following treated layer (A).(A) a layer with a distribution of oxygen atoms and having an F/C ratio, i.e. ratio of the number of fluorine atoms (F) to the number of carbon atoms (C), of not greater than 1.12 and an O/C ratio, i.e. ratio of the number of oxygen atoms (O) to the number of carbon atoms (C), of not less than 0.08.Type: GrantFiled: November 6, 1997Date of Patent: July 6, 1999Assignee: Tokai Rubber Industries, Ltd.Inventors: Katsuhiko Yokoe, Kazuhiro Kato, Koyo Murakami, Eiichi Daikai, Hiroaki Ito
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Patent number: 5776570Abstract: A fuel hose comprising an outer rubber layer wherein polysulfide is crosslinked so that polysulfide bonding density is not less than 4.times.10.sup.-5 mol/cm.sup.3 and acrylonitrile-butadiene rubber having a carboxyl group is contained, and an inner polyamide resin layer which is laminated on the inside face of the outer rubber layer and bonded thereon by heat treatment. Since the polyamide resin powder is melted by the heat treatment and the polysulfide bonding decomposes so that the resultant residue after decomposition combines with polyamide molecules, resulting in a direct and strong bonding of the outer rubber layer and the inner polyamide resin layer. Moreover, since the special acrylonitrile-butadiene rubber is mixed therein, it is possible to set up the heat treatment condition at a rather mild one.Type: GrantFiled: February 20, 1996Date of Patent: July 7, 1998Assignee: Tokai Rubber Industries Ltd.Inventors: Koyo Murakami, Hiroaki Ito, Tetsuji Narasaki
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Patent number: 5771939Abstract: A fuel hose comprising an outer rubber layer wherein polysulfide is crosslinked so that polysulfide bonding density is not less than 4.times.10.sup.-5 mol/cm.sup.3 and phenol based resin is contained, and an inner polyamide resin layer which is laminated on the inside face of the outer rubber layer and bonded thereon by heat treatment. Since the polyamide resin powder is melted by the heat treatment and the polysulfide bonding decomposes so that the resultant residue after decomposition combines with polyamide molecules, resulting in a direct and strong bonding of the outer rubber layer and the inner polyamide resin layer. Moreover, since the phenol based resin is mixed therein, it is possible to set up the heat treatment condition at a rather mild one.Type: GrantFiled: February 20, 1996Date of Patent: June 30, 1998Assignee: Tokai Rubber Industries, Ltd.Inventors: Koyo Murakami, Hiroaki Ito, Tetsuji Narasaki
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Patent number: 5770285Abstract: A fuel hose comprising an outer rubber layer wherein polysulfide is crosslinked so that polysulfide bonding density is not less than 4.times.10.sup.-5 mol/cm.sup.3, and an inner polyamide resin layer which is laminated on the inside face of the outer rubber layer and bonded thereon by heat treatment. Since the polyamide resin powder is melted by the heat treatment and the polysulfide bonding decomposes so that the resultant residue after decomposition combines with polyamide molecules, resulting in a direct and strong bonding of the outer rubber layer and the inner polyamide resin layer.Type: GrantFiled: February 16, 1996Date of Patent: June 23, 1998Assignee: Tokai Rubber Industries, Ltd.Inventors: Koyo Murakami, Hiroaki Ito, Tetsuji Narasaki
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Patent number: 5718957Abstract: The fuel hose of this invention is a fuel hose comprising a tubular fluororesin inner ply and, as laminated onto the peripheral surface thereof, a thermoplastic resin or rubber outer ply, the tubular fluororesin inner ply having been molded from a fluororesin with an F/C ratio, i.e. ratio of the number of fluorine atoms (F) to the number of carbon atoms (C), of not greater than 1.6 and the peripheral surface layer of the fluororesin inner ply having been modified into the following treated layer (A).(A) a layer with a distribution of oxygen atoms and having an F/C ratio, i.e. ratio of the number of fluorine atoms (F) to the number of carbon atoms (C), of not greater than 1.12 and an O/C ratio, i.e. ratio of the number of oxygen atoms (O) to the number of carbon atoms (C), of not less than 0.08.Type: GrantFiled: May 9, 1995Date of Patent: February 17, 1998Assignee: Tokai Rubber Industries, Ltd.Inventors: Katsuhiko Yokoe, Kazuhiro Kato, Koyo Murakami, Eiichi Daikai, Hiroaki Ito
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Patent number: 5622757Abstract: A fuel hose comprising an outer rubber layer wherein polysulfide is crosslinked so that polysulfide bonding density is not less than 4.times.10.sup.-5 mol/cm.sup.3 and an epoxy compound having epoxy equivalent at not more than 300 is contained, and an inner polyamide resin layer which is laminated on the inside face of the outer rubber layer and bonded thereon by heat treatment. Since the polyamide resin powder is melted by the heat treatment and the polysulfide bonding decomposes so that the resultant residue after decomposition combines with polyamide molecules, resulting in a direct and strong bonding of the outer rubber layer and the inner polyamide resin layer. Moreover, since the special epoxy compound is mixed therein, it is possible to set up the heat treatment condition at a rather mild one.Type: GrantFiled: February 16, 1996Date of Patent: April 22, 1997Assignee: Tokai Rubber Industries, Ltd.Inventors: Koyo Murakami, Hiroaki Ito, Tetsuji Narasaki
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Patent number: 5618629Abstract: A flexible partition member for a hydraulic accumulator, which divides an interior of a shell of the accumulator into two sections that provide a gas chamber and a liquid chamber, respectively. The flexible partition member includes an integrally layered composite portion which includes at least one gas-barrier layer and at least one elastic layer, each gas-barrier layer containing a copolymer of ethylene and vinyl alcohol, and each elastic layer containing as a major component thereof a polyamide resin selected from the group consisting of nylon 6, nylon 66, nylon 6-10 and nylon 6-12. The integrally layered composite portion includes two adjacent layers which include a gas-barrier layer and an elastic layer.Type: GrantFiled: July 5, 1994Date of Patent: April 8, 1997Assignee: Tokai Rubber Industries, Inc.Inventors: Shigeaki Takamatsu, Koyo Murakami
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Patent number: RE38087Abstract: The fuel hose of this invention is a fuel hose comprising a tubular fluororesin inner ply and, as laminated onto the peripheral surface thereof, a thermoplastic resin or rubber outer ply, the tubular fluororesin inner ply having been molded from a fluororesin with an F/C ratio, i.e. ratio of the number of fluorine atoms (F) to the number of carbon atoms (C), of not greater than 1.6 and the peripheral surface layer of the fluororesin inner ply having been modified into the following treated layer (A). (A) a layer with a distribution of oxygen atoms and having an F/C ratio, i.e. ratio of the number of fluorine atoms (F) to the number of carbon atoms (C), of not greater than 1.12 and an O/C ratio, i.e. ratio of the number of oxygen atoms (O) to the number of carbon atoms (C), of not less than 0.08.Type: GrantFiled: February 16, 2000Date of Patent: April 22, 2003Assignee: Tokai Rubber Industries, Ltd.Inventors: Katsuhiko Yokoe, Kazuhiro Kato, Koyo Murakami, Eiichi Daikai, Hiroaki Ito