Patents by Inventor Isao Tan
Isao Tan 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: 11686231Abstract: Provided are an LNT layered catalyst for a lean burn gasoline engine having an enhanced NOx storage rate and capable of developing a higher NOx purification rate, and an exhaust gas purification apparatus using the same, the LNT layered catalyst including a substrate, a first catalyst layer including ceria-alumina particles carrying Pt, Pd, and BaO, and a second catalyst layer including ceria-alumina particles carrying Pt and Rh, in which a content of Pt in the first catalyst layer is 0.45 to 0.85 mass %; among Pt included in the first catalyst layer, a content proportion in a first depth region is 88 to 90 mass %, and a content proportion in a second depth region is 10 to 12 mass %; a content of Ba in the first catalyst layer is 4 to 11 mass %; and the second catalyst layer is substantially free from Ba.Type: GrantFiled: February 17, 2021Date of Patent: June 27, 2023Assignees: N.E. CHEMCAT Corporation, SUBARU CORPORATIONInventors: Yasuyoshi Sasaki, Isao Tan, Shunsuke Fukutomi, Takehiro Fujimura, Shuya Omata
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Patent number: 11352933Abstract: An exhaust gas purification device includes a first catalyst, a bypass pipe, a second catalyst, and a switching controller. The first catalyst is provided in an exhaust pipe. The bypass pipe branches from a first portion of the exhaust pipe. The first portion is located upstream of the first catalyst. The bypass pipe is recoupled to a second portion of the exhaust pipe. The second portion is located upstream of the first catalyst. The second catalyst is provided in the bypass pipe. The switching controller is configured to switch a flow path of an exhaust gas to the bypass pipe based on a deterioration degree of the first catalyst.Type: GrantFiled: January 5, 2021Date of Patent: June 7, 2022Assignee: SUBARU CORPORATIONInventors: Yasuyoshi Sasaki, Isao Tan
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Patent number: 11208930Abstract: An exhaust gas purification apparatus includes a three-way catalyst. The three-way catalyst includes a downstream catalyst layer and an upstream catalyst layer. The downstream catalyst layer is to be provided in an exhaust pipe. The downstream catalyst layer contains a noble metal material containing at least one of Pd, Rh, or Pt, and an OSC material containing at least ceria. The upstream catalyst layer is to be provided in the exhaust pipe closer to an engine than the downstream catalyst layer is. The upstream catalyst layer contains the noble metal material and the OSC material. The upstream catalyst layer contains the ceria at a content less than a content of the ceria in the downstream catalyst layer.Type: GrantFiled: August 27, 2020Date of Patent: December 28, 2021Assignee: SUBARU CORPORATIONInventors: Yasuyoshi Sasaki, Isao Tan
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Publication number: 20210270165Abstract: Provided are an LNT layered catalyst for a lean burn gasoline engine having an enhanced NOx storage rate and capable of developing a higher NOx purification rate, and an exhaust gas purification apparatus using the same, the LNT layered catalyst including a substrate, a first catalyst layer including ceria-alumina particles carrying Pt, Pd, and BaO, and a second catalyst layer including ceria-alumina particles carrying Pt and Rh, in which a content of Pt in the first catalyst layer is 0.45 to 0.85 mass %; among Pt included in the first catalyst layer, a content proportion in a first depth region is 88 to 90 mass %, and a content proportion in a second depth region is 10 to 12 mass %; a content of Ba in the first catalyst layer is 4 to 11 mass %; and the second catalyst layer is substantially free from Ba.Type: ApplicationFiled: February 17, 2021Publication date: September 2, 2021Applicants: N.E. CHEMCAT Corporation, SUBARU CORPORATIONInventors: Yasuyoshi SASAKI, Isao TAN, Shunsuke FUKUTOMI, Takehiro FUJIMURA, Shuya OMATA
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Publication number: 20210254535Abstract: An exhaust gas purification device includes a first catalyst, a bypass pipe, a second catalyst, and a switching controller. The first catalyst is provided in an exhaust pipe. The bypass pipe branches from a first portion of the exhaust pipe. The first portion is located upstream of the first catalyst. The bypass pipe is recoupled to a second portion of the exhaust pipe. The second portion is located upstream of the first catalyst. The second catalyst is provided in the bypass pipe. The switching controller is configured to switch a flow path of an exhaust gas to the bypass pipe based on a deterioration degree of the first catalyst.Type: ApplicationFiled: January 5, 2021Publication date: August 19, 2021Applicant: SUBARU CORPORATIONInventors: Yasuyoshi SASAKI, Isao TAN
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Publication number: 20210095589Abstract: An exhaust gas purification apparatus includes a three-way catalyst. The three-way catalyst includes a downstream catalyst layer and an upstream catalyst layer. The downstream catalyst layer is to be provided in an exhaust pipe. The downstream catalyst layer contains a noble metal material containing at least one of Pd, Rh, or Pt, and an OSC material containing at least ceria. The upstream catalyst layer is to be provided in the exhaust pipe closer to an engine than the downstream catalyst layer is. The upstream catalyst layer contains the noble metal material and the OSC material. The upstream catalyst layer contains the ceria at a content less than a content of the ceria in the downstream catalyst layer.Type: ApplicationFiled: August 27, 2020Publication date: April 1, 2021Applicant: SUBARU CORPORATIONInventors: Yasuyoshi SASAKI, Isao TAN
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Publication number: 20150265968Abstract: Provided is a catalyst composition capable of preventing decrease in catalytic activity due to grain growth of noble metal under high temperature or under change in oxidation reduction or further for long term use, and of achieving excellent catalytic activity over a long time. The catalyst composition containing a composite oxide represented by the following general formula (1): AO.x(B2-yCyO3-?)??(1) (wherein A represents an element selected from monovalent elements, divalent elements and lanthanides; B represents a trivalent element; and C represents a noble metal; x represents an integer of 1 to 6; y represents an atomic ratio satisfying the following relation; 0<y<2; and a represents a deficient, atomic ratio of oxygen atoms) is prepared.Type: ApplicationFiled: June 8, 2015Publication date: September 24, 2015Applicant: CATALER CORPORATIONInventors: Hirohisa TANAKA, Isao TAN, Mari UENISHI, Masashi TANIGUCHI, Mareo KIMURA, Satoshi MATSUEDA
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Patent number: 8993475Abstract: An excellent oxygen storage capacity is achieved even in the case used for a long period of time under high temperature conditions. An oxygen storage material contains a first particle made of a composite oxide of cerium and zirconium or a composite oxide of cerium, a rare-earth element other than cerium and zirconium, a second particle including a composite oxide of a rare-earth element, an alkaline-earth element and zirconium, and a precious metal. A part of the precious metal forms a solid solution with the composite oxide included in the second particle.Type: GrantFiled: June 22, 2007Date of Patent: March 31, 2015Assignees: Cataler Corporation, Toyota Jidosha Kabushiki KaishaInventors: Mareo Kimura, Keiichi Narita, Akimasa Hirai, Akiya Chiba, Naoto Miyoshi, Kazunobu Ishibashi, Takaaki Kanazawa, Takeru Yoshida, Hirohisa Tanaka, Mari Uenishi, Isao Tan, Masashi Taniguchi
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Publication number: 20140271431Abstract: Provided is a method for purifying exhaust gas discharged from an internal combustion engine of a vehicle, using an exhaust gas purifying catalyst including a composite oxide represented by the following general formula AO.x(B2-yCyO3-?), wherein A represents an element selected from monovalent elements, divalent elements and lanthanides; B represents a trivalent element; and C represents a noble metal; x represents an integer of 1; y represents an atomic ratio satisfying the following relation: 0<y<2; and ? represents a deficient atomic ratio of oxygen atoms; and wherein the composite oxide has a spinel type crystal phase, and wherein the exhaust gas purifying catalyst removes carbon monoxide (CO) exhaust gas discharged from the internal combustion engine of the vehicle.Type: ApplicationFiled: May 22, 2014Publication date: September 18, 2014Applicants: CATALER CORPORATION, DAIHATSU MOTOR CO., LTD.Inventors: Hirohisa TANAKA, Isao TAN, Mari UENISHI, Masashi TANIGUCHI, Mareo KIMURA, Satoshi MATSUEDA
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Patent number: 8623125Abstract: An electrode for plasma generation according to the present invention includes a plurality of collecting portions having a plurality of through holes, the plurality of collecting portions facing a gas flow in a direction where gas to be treated flows and provided spaced apart from each other. The electrode is applied to a plasma reactor of a treatment device to be provided for a device which discharges the smoke including PM, for example, an exhaust gas purifying device for automobile, or a smoke treatment device used in a facility where the smoke is discharged such as a plant.Type: GrantFiled: July 28, 2008Date of Patent: January 7, 2014Assignee: Daihatsu Motor Co., Ltd.Inventors: Yoonho Kim, Kazuya Naito, Takashi Ogawa, Isao Tan, Hirohisa Tanaka, Hirotoshi Fujikawa, Kazuhiko Madokoro
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Patent number: 8133839Abstract: An exhaust gas-purifying catalyst (1) contains a rare-earth element, an alkaline-earth element, zirconium and a precious metal, wherein an atomic ratio of the alkaline-earth element with respect to a sum of the rare-earth element and the zirconium is 10 atomic % or more, a part of the rare-earth element and a part of zirconium form a composite oxide with at least a part of the alkaline-earth element, and the composite oxide and a part of the precious metal form a solid solution.Type: GrantFiled: June 2, 2006Date of Patent: March 13, 2012Assignees: Cataler Corporation, Daihatsu Motor Co., Ltd.Inventors: Satoshi Matsueda, Mareo Kimura, Akimasa Hirai, Keiichi Narita, Hirohisa Tanaka, Mari Uenishi, Isao Tan, Masashi Taniguchi
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Publication number: 20110232492Abstract: An electrode for plasma generation according to the present invention includes a plurality of collecting portions having a plurality of through holes, the plurality of collecting portions facing a gas flow in a direction where gas to be treated flows and provided spaced apart from each other. The electrode is applied to a plasma reactor of a treatment device to be provided for a device which discharges the smoke including PM, for example, an exhaust gas purifying device for automobile, or a smoke treatment device used in a facility where the smoke is discharged such as a plant.Type: ApplicationFiled: July 28, 2008Publication date: September 29, 2011Applicant: DAIHATSU MOTOR CO., LTD.Inventors: Yoonho Kim, Kazuya Naito, Takashi Ogawa, Isao Tan, Hirohisa Tanaka, Hirotoshi Fujikawa, Kazuhiko Madokoro
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Patent number: 7795170Abstract: Provided is a catalyst with a noble metal efficiently supported on the surfacemost thereof. A composite oxide-containing layer is formed on a catalyst carrier so as to contain a perovskite-type composite oxide represented by the following general formula (1) and an other composite oxide, and a noble metal layer is further formed on the catalyst carrier so as to be supported on the surfacemost of the catalyst carrier by immersing the catalyst carrier formed with the composite oxide-containing layer in an aqueous noble metal salt solution to impregnate the catalyst carrier with the aqueous noble metal salt solution: AxByO3±???(1) (wherein A represents at least one element selected from rare earth elements and alkaline earth metals; B represents at least one element selected from transition elements (excluding rare earth elements); x represents an atomic ratio of less than 1; y represents an atomic ratio of 1.0; and ? represents an oxygen excess or an oxygen deficiency.Type: GrantFiled: April 23, 2007Date of Patent: September 14, 2010Assignees: Daihatsu Motor Co., Cataler CorporationInventors: Hirohisa Tanaka, Isao Tan, Mari Uenishi, Masashi Taniguchi, Mareo Kimura, Satoshi Matsueda, Akimasa Hirai, Keiichi Narita
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Publication number: 20100227759Abstract: Provided is a catalyst composition capable of preventing decrease in catalytic activity due to grain growth of noble metal under high temperature or under change in oxidation reduction or further for long term use, and of achieving excellent catalytic activity over a long time. The catalyst composition containing a composite oxide represented by the following general formula (1): AO.x(B2-yCyO3-?)??(1) (wherein A represents an element selected from monovalent elements, divalent elements and lanthanides; B represents a trivalent element; and C represents a noble metal; x represents an integer of 1 to 6; y represents an atomic ratio satisfying the following relation: 0<y<2; and ? represents a deficient atomic ratio of oxygen atoms) is prepared.Type: ApplicationFiled: March 8, 2007Publication date: September 9, 2010Applicants: DAIHATSU MOTOR CO., LTD., CATALER CORPORATIONInventors: Hirohisa Tanaka, Isao Tan, Mari Uenishi, Masashi Taniguchi, Mareo Kimura, Satoshi Matsueda
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Publication number: 20100004123Abstract: An excellent oxygen storage capacity is achieved even in the case used for a long period of time under high temperature conditions. An oxygen storage material contains a first particle made of a composite oxide of cerium and zirconium or a composite oxide of cerium, a rare-earth element other than cerium and zirconium, a second particle including a composite oxide of a rare-earth element, an alkaline-earth element and zirconium, and a precious metal. A part of the precious metal forms a solid solution with the composite oxide included in the second particle.Type: ApplicationFiled: June 22, 2007Publication date: January 7, 2010Applicants: CATALER CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA, DAIHATSU MOTOR CO., LTD.Inventors: Mareo Kimura, Keiichi Narita, Akimasa Hirai, Akiya Chiba, Naoto Miyoshi, Kazunobu Ishibashi, Takaaki Kanazawa, Takeru Yoshida, Hirohisa Tanaka, Mari Uenishi, Isao Tan, Masashi Taniguchi
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Patent number: 7625836Abstract: To provide a heat-resistant oxide which is excellent in heat resistance and durability at high temperature and has high activity, a heat-resistant oxide which has an oxide crystal structure and in which a rate of a solid solution of a noble metal in the oxide crystal structure is 50% or more is obtained by heat-treating (secondarily baking) a precursor composition comprising zirconia, at least one coordinative element selected from the group consisting of rare earth elements, alkaline earth elements, aluminum and silicon, and at least one noble metal selected from the group consisting of platinum, rhodium and palladium at 650° C. or higher.Type: GrantFiled: December 13, 2005Date of Patent: December 1, 2009Assignees: Cataler Corporation, Daihatsu Motor Co., Ltd.Inventors: Satoshi Matsueda, Mareo Kimura, Naoto Miyoshi, Yoshinori Ishii, Hirohisa Tanaka, Isao Tan, Mari Uenishi, Masashi Taniguchi
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Patent number: 7622418Abstract: To provide a method for industrially efficiently producing an exhaust gas purifying catalyst containing a perovskite-type composite oxide which is stable and has a less reduced specific surface area and is also effectively prevented from decreasing in its catalytic performance even in endurance in high temperature oxidative reducing atmospheres, a pre-crystallization composition containing elementary components constituting a perovskite-type composite oxide containing a noble metal is prepared, is mixed with a powder of theta-alumina and/or alpha-alumina to prepare a mixture, and the mixture is heat treated. Thus, the resulting perovskite-type composite oxide supported by the powder of theta-alumina and/or alpha-alumina can keep its thermostability at a sufficient level thereby to effectively prevent the catalytic performance from decreasing. This method can industrially efficiently produce the exhaust gas purifying catalyst.Type: GrantFiled: July 3, 2003Date of Patent: November 24, 2009Assignees: Daihatsu Motor Company, Ltd., Hokko Chemical Industry Co., Ltd.Inventors: Hirohisa Tanaka, Isao Tan, Mari Uenishi, Nobuhiko Kajita, Masashi Taniguchi, Yasunori Sato, Keiichi Narita, Noboru Sato
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Patent number: 7601325Abstract: To provide a perovskite-type composite oxide which has stable quality in which a solid solution of Pd is formed at a high rate, a method for producing the perovskite-type composite oxide, and a catalyst composition containing the perovskite-type composite oxide, the perovskite-type composite oxide is produced by formulating materials in accordance with each atomic ratio of a perovskite-type composite oxide represented by the following general formula (1): AxB(1-y)PdyO3+???(1) wherein A represents at least one element selected from rare earth elements and alkaline earth metals; B represents at least one element selected from transition elements (excluding rare earth elements, and Pd), Al and Si; x represents an atomic ratio satisfying the following condition: 1<x; y represents an atomic ratio satisfying the following condition: 0<y?0.5; and ? represents an oxygen excess.Type: GrantFiled: March 18, 2005Date of Patent: October 13, 2009Assignees: Daihatsu Motor Co., Ltd., Hokko Chemical Industry Co., Ltd., Cataler CorporationInventors: Hirohisa Tanaka, Isao Tan, Mari Uenishi, Nobuhiko Kajita, Masashi Taniguchi, Kimiyoshi Kaneko, Senshu Mitachi, Mareo Kimura, Keiichi Narita, Noboru Sato
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Publication number: 20090253574Abstract: Provided is a catalyst with a noble metal efficiently supported on the surfacemost thereof. A composite oxide-containing layer is formed on a catalyst carrier so as to contain a perovskite-type composite oxide represented by the following general formula (1) and an other composite oxide, and a noble metal layer is further formed on the catalyst carrier so as to be supported on the surfacemost of the catalyst carrier by immersing the catalyst carrier formed with the composite oxide-containing layer in an aqueous noble metal salt solution to impregnate the catalyst carrier with the aqueous noble metal salt solution: AxByO3±???(1) (wherein A represents at least one element selected from rare earth elements and alkaline earth metals; B represents at least one element selected from transition elements (excluding rare earth elements); x represents an atomic ratio of less than 1; y represents an atomic ratio of 1.0; and ? represents an oxygen excess or an oxygen deficiency.Type: ApplicationFiled: April 23, 2007Publication date: October 8, 2009Applicants: DAIHATSU MOTOR CO., LTD., CATALER CORPORATIONInventors: Hirohisa Tanaka, Isao Tan, Mari Uenishi, Masashi Taniguchi, Mareo Kimura, Satoshi Matsueda, Akimasa Hirai, Keiichi Narita
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Patent number: 7576032Abstract: A catalyst composition which prevents deterioration due to grain growth of Rh and/or Pt, includes a perovskite-type composite oxide represented by the following general formula (1): A1?xA?xB1?(y+z)B?yNzO3??(1) wherein A represents at least one element selected from alkaline earth metals; A? represents at least one element selected from rare earth elements; B represents at least one element selected from Ti, Zr, and Hf; B? represents at least one element selected from transition elements (excluding rare earth elements, Ti, Zr, Hf, Rh, and Pt) and Al; N represents at least one element selected from Rh and Pt; x represents an atomic ratio satisfying the following condition: 0?x?0.4; y represents an atomic ratio satisfying the following condition: 0?y<0.5; z represents an atomic ratio satisfying the following condition: 0<z?0.5; and X represents 0 when N represents Pt alone.Type: GrantFiled: December 15, 2004Date of Patent: August 18, 2009Assignee: Daihatsu Motor Co., Ltd.Inventors: Hirohisa Tanaka, Isao Tan, Mari Uenishi, Masashi Taniguchi