Patents by Inventor Tosiharu Kondo
Tosiharu Kondo 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: 7358210Abstract: A ceramic body that can support a required amount of catalyst component, without lowering the characteristics such as strength, manufactured without forming a coating layer and providing a high performance ceramic catalyst body that is excellent in practical utility and durability. This ceramic body is made by substituting at least one of the constituent elements of cordierite that constitutes the substrate ceramic, for example Al, with W that is the element having an empty orbit in d or f orbit, has high bonding strength and is less susceptible to deterioration since the catalyst component Pt is supported by means of chemical bonding.Type: GrantFiled: March 22, 2002Date of Patent: April 15, 2008Assignees: Denso Corporation, Nippon Soken, Inc.Inventors: Masakazu Tanaka, Tomomi Hase, Takashi Kondo, Tosiharu Kondo, Hiromi Sano, Jun Hasegawa, Miho Ito, Tomohiko Nakanishi, Kazuhiko Koike, Takumi Suzawa
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Patent number: 7129193Abstract: This invention aims at providing a catalyst body exhibiting a lower degradation of a catalyst due to thermal durability and capable of keeping higher catalyst performance for a long time. A catalyst component such as Pt is directly supported by Zr, W, etc, replacing elements inside a support such as Al of cordierite to provide a catalyst body without forming a coating layer. A combination of the catalyst component and the element inside the support is selected so that support strength is greater than 5 eV by simulation using a density functional method. Coarsening of catalyst particles can be suppressed and a high-performance catalyst body excellent in thermal durability can be obtained.Type: GrantFiled: February 12, 2003Date of Patent: October 31, 2006Assignee: Denso CorporationInventors: Miho Ito, Jun Hasegawa, Tosiharu Kondo, Tomohiko Nakanishi
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Patent number: 7067452Abstract: (i) In a ceramic catalyst body which comprises a ceramic carrier which has a multitude of pores capable of supporting a catalyst directly on the surface of a substrate ceramic and a catalyst supported on the ceramic carrier, a layer containing an anti-evaporation metal such as Rh is formed on the outer surface of catalyst metal particles such as Pt or Rh. The layer containing the anti-evaporation metal protects the catalyst metal and prevents evaporation thereof, thereby suppressing the deterioration; and/or (ii) A ceramic catalyst body is made by having a main catalyst component and a promoter component directly on a ceramic carrier which can directly support the catalyst by substituting a part of the constituent elements of cordierite, and a trap layer is provided in the upstream thereof for trapping sulfur which is a catalyst poisoning component included in the exhaust gas.Type: GrantFiled: September 24, 2001Date of Patent: June 27, 2006Assignees: Denso Corporation, Nippon Soken, Inc.Inventors: Masakazu Tanaka, Tosiharu Kondo, Tomohiko Nakanishi, Kazuhiko Koike, Takashi Kondo, Tomomi Hase, Miho Ito
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Patent number: 7048894Abstract: A catalyst-loaded ceramic filter made of a ceramic material capable of directly supporting a catalyst component thereon is capable of providing early activation of the catalyst with a low coefficient of thermal expansion and light weight, without compromising the high porosity of the filter substrate. A catalyst-loaded ceramic filter is made of a ceramic material of which one or more kinds of element among its constituent elements is substituted with an element other than the constituent elements, for example a ceramic material with a part of Si or other elements included in cordierite is substituted with W or Co, as a filter substrate of honeycomb structure having a number of cells separated by porous walls, and supporting a catalyst such as a noble metal directly on the W.Type: GrantFiled: June 27, 2002Date of Patent: May 23, 2006Assignee: Denso CorporationInventors: Masakazu Tanaka, Tosiharu Kondo, Hiromi Sano, Mamoru Nishimura
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Publication number: 20030224933Abstract: The present invention can realize a catalyst body which can efficiently achieve a catalytic reaction with a minimum required amount of catalyst and can exhibit high catalytic performance at low cost.Type: ApplicationFiled: May 15, 2003Publication date: December 4, 2003Inventors: Tosiharu Kondo, Masakazu Tanaka, Hideaki Ueno, Hiromasa Suzuki
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Publication number: 20030158035Abstract: This invention aims at providing a catalyst body exhibiting a lower degradation of a catalyst due to thermal durability and capable of keeping higher catalyst performance for a long time. A catalyst component such as Pt is directly supported by Zr, W, etc, replacing elements inside a support such as Al of cordierite to provide a catalyst body without forming a coating layer. A combination of the catalyst component and the element inside the support is selected so that support strength is greater than 5 eV by simulation using a density functional method. Coarsening of catalyst particles can be suppressed and a high-performance catalyst body excellent in thermal durability can be obtained.Type: ApplicationFiled: February 12, 2003Publication date: August 21, 2003Inventors: Miho Ito, Jun Hasegawa, Tosiharu Kondo, Tomohiko Nakanishi
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Publication number: 20030109383Abstract: In a catalyst body using a direct support, this invention provides a ceramic catalyst body capable of adjusting catalyst performance in accordance with intended objects such as prevention of deactivation of a main catalyst component when an sub catalyst component is used, or improvement of initial purification performance. When both main catalyst component and sub catalyst component are supported on a ceramic support capable of directly supporting the catalyst components, the invention first supports a catalyst metal as a main catalyst such as Pt, for example, and then supports the sub catalyst such as CeO2 on the main catalyst. The main catalyst is thus prevented from being involved in the grain growth of the sub catalyst, and becomes a catalyst body that does not easily undergo thermal deactivation. The ceramic support uses cordierite, a part of the constituent elements of which are replaced, so that the replacing elements so introduced can directly support the catalyst components.Type: ApplicationFiled: December 5, 2002Publication date: June 12, 2003Inventors: Kazuhiko Koike, Tosiharu Kondo, Tomohiko Nakanishi, Miho Ito, Jun Hasegawa
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Publication number: 20030092567Abstract: The present invention provides a ceramic catalyst body having low thermal capacity and low pressure loss, is capable of demonstrating various catalytic actions according to the application, and has high catalyst performance and practical usefulness.Type: ApplicationFiled: November 8, 2002Publication date: May 15, 2003Inventors: Masakazu Tanaka, Tosiharu Kondo, Takumi Suzawa, Jun Hasegawa, Tomohiko Nakanishi, Tomomi Hase
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Publication number: 20030061862Abstract: The invention provides a gas concentration detection element that can prevent the drop of catalytic activity due to thermal aggregation of catalyst particles under high temperature conditions, can maintain a stable output for a long time and can be easily produced at a low production cost. A reference electrode 12 is formed on an inner surface of a cup-like oxygen ion conductive solid electrolyte 11 and a detection electrode 13 is formed on its outer surface to constitute a gas concentration detection element 1 for detecting a specific gas component in a measured gas. A catalyst layer 15 is constituted by directly supporting a catalyst component on ceramic support particles, such as particles of element-substituted cordierite, through a chemical bond so that both bonding strength and durability can be improved.Type: ApplicationFiled: September 26, 2002Publication date: April 3, 2003Inventors: Tosiharu Kondo, Minoru Ota, Hiromi Sano, Miho Ito, Tomohiko Nakanishi
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Publication number: 20030045422Abstract: The present invention has an object to obtain a ceramic body that can support a required amount of catalyst component, without lowering the characteristics such as strength, being manufactured without forming a coating layer and providing a high performance ceramic catalyst body that is excellent in practical utility and durability.Type: ApplicationFiled: March 22, 2002Publication date: March 6, 2003Inventors: Masakazu Tanaka, Tomomi Hase, Takashi Kondo, Tosiharu Kondo, Hiromi Sano, Jun Hasegawa, Miho Ito, Tomohiko Nakanishi, Kazuhiko Koike, Takumi Suzawa
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Publication number: 20030022788Abstract: The present invention provides a ceramic catalyst body having more excellent catalytic performance using a ceramic carrier capable of directly supporting the catalyst component.Type: ApplicationFiled: July 26, 2002Publication date: January 30, 2003Inventors: Masakazu Tanaka, Tosiharu Kondo, Takashi Kondo, Tomomi Hase
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Publication number: 20030007905Abstract: The present invention provides a catalyst-loaded ceramic filter that is made of a ceramic material capable of directly supporting a catalyst component thereon, and is capable of providing early activation of the catalyst with a low coefficient of thermal expansion and light weight, without compromising the high porosity of the filter substrate.Type: ApplicationFiled: June 27, 2002Publication date: January 9, 2003Inventors: Masakazu Tanaka, Tosiharu Kondo, Hiromi Sano, Mamoru Nishimura
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Publication number: 20020077248Abstract: The present invention provides a ceramic carrier and a ceramic catalyst which have NOx absorbent capacity, low heat capacity, low pressure loss and high practical value.Type: ApplicationFiled: September 24, 2001Publication date: June 20, 2002Inventors: Tomohiko Nakanishi, Kazuhiko Koike, Masakazu Tanaka, Tosiharu Kondo, Takashi Kondo, Tomomi Hase, Jun Hasegawa
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Publication number: 20020045541Abstract: It is an object of the present invention to provide a ceramic catalyst body with a better catalyst performance by using a ceramic carrier capable of directly supporting a catalyst component.Type: ApplicationFiled: October 1, 2001Publication date: April 18, 2002Inventors: Kazuhiko Koike, Tomohiko Nakanishi, Masakazu Tanaka, Tosiharu Kondo
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Publication number: 20020042344Abstract: The present invention improves a ceramic carrier capable of directly supporting a catalyst component and provides a ceramic carrier and a ceramic catalyst body which have high catalyst performance and practical value.Type: ApplicationFiled: September 24, 2001Publication date: April 11, 2002Inventors: Tosiharu Kondo, Masakazu Tanaka, Tomohiko Nakanishi, Kazuhiko Koike
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Publication number: 20020039964Abstract: The object of the present invention is to improve the catalyst performance of a ceramic support that enables a catalyst component to be loaded directly, prevent thermal degradation and so forth, and enhance durability.Type: ApplicationFiled: September 24, 2001Publication date: April 4, 2002Inventors: Masakazu Tanaka, Tosiharu Kondo, Tomohiko Nakanishi, Kazuhiko Koike
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Publication number: 20020039966Abstract: (i) In a ceramic catalyst body which comprises a ceramic carrier which has a multitude of pores capable of supporting a catalyst directly on the surface of a substrate ceramic and a catalyst supported on the ceramic carrier, a layer containing an anti-evaporation metal such as Rh is formed on the outer surface of catalyst metal particles such as Pt or Rh.Type: ApplicationFiled: September 24, 2001Publication date: April 4, 2002Inventors: Masakazu Tanaka, Tosiharu Kondo, Tomohiko Nakanishi, Kazuhiko Koike, Takashi Kondo, Tomomi Hase, Miho Ito
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Patent number: 6254963Abstract: The present invention provides a honeycomb structure that is able to suppress separation of a loaded catalyst layer much better than the prior art, and its production process. This honeycomb structure is made in the form of honeycombs partitions having for their main component cordierite having a chemical composition of 45-55 wt % SiO2, 33-42 wt % Al2O3 and 12-18 wt % MgO, and fifty or more pores (number/1.65 mm2) having a mean diameter of 1-20 &mgr;m are provided in the surfaces of the partitions.Type: GrantFiled: April 16, 1999Date of Patent: July 3, 2001Assignee: Denso CorporationInventor: Tosiharu Kondo
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Patent number: 6159893Abstract: A honeycomb structure in which partitioning walls comprising, as a chief component, cordierite of a chemical composition containing 45 to 55% by weight of SiO.sub.2, 33 to 42% by weight of Al.sub.2 O.sub.3, and 12 to 18% by weight of MgO are formed in the shape of a honeycomb. The partitioning walls have a thickness of not larger than 250 .mu.m and a porosity of from 45 to 80%.Type: GrantFiled: March 25, 1999Date of Patent: December 12, 2000Assignee: Denso CorporationInventor: Tosiharu Kondo
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Patent number: 5409759Abstract: To improve the strength of the laser weld bond between an inner honeycomb column and an outer metal case, a metal honeycomb assembly comprises a metal honeycomb column composed of a flat metal sheet and a wavy metal sheet which are mutually laminated and spirally wound together, the metal honeycomb column having an outermost circumferential portion in the form of a composite wavy sheet composed of a plurality of superposed layers of the wavy metal sheet; and a metal case fittingly enclosing the metal honeycomb column, the metal case and the metal honeycomb column being bonded together by laser-welding the wave peaks of the composite wavy sheet to an inner wall of the metal case.Type: GrantFiled: August 23, 1993Date of Patent: April 25, 1995Assignees: Nippondenso Co., Ltd., Nippon Soken Inc.Inventors: Tosiharu Kondo, Keiji Ito, Takasi Obata, Kiyotaka Matuo, Yasuyuki Kawabe, Yukikatsu Ozaki