Patents by Inventor Isao Naito
Isao Naito 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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Publication number: 20240075463Abstract: Particles for an exhaust gas purification catalyst including: inorganic oxide particles; and an inorganic coating layer covering the inorganic oxide particles. The particles for an exhaust gas purification catalyst have reduced cumulative pore volume in a pore diameter range of 0.1-20 ?m compared to a cumulative pore volume in a pore diameter range of 0.1-20 ?m of inorganic oxide particles before being coated with the inorganic coating layer. Accordingly, the particles for an exhaust gas purification catalyst have a higher thermal conductivity than the inorganic oxide particles before being coated with the inorganic coating layer.Type: ApplicationFiled: December 27, 2021Publication date: March 7, 2024Applicant: CATALER CORPORATIONInventors: Yukiko YAMASHITA, Satoshi MATSUEDA, Isao NAITO
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Patent number: 11821349Abstract: An exhaust gas purification catalyst including an alkaline-earth metal carried on a porous carrier in a highly dispersed state. The catalyst layer of the exhaust gas purification catalyst has an alkaline-earth metal carrying region including a porous carrier, Pt, and a sulfuric acid salt of at least one alkaline-earth metal carried on the porous carrier, wherein a value of RAe/Pt is 0.5 or more, where RAe/Pt represents the Pearson's correlation coefficient calculated using ? and ? in each pixel obtained by, for a cross section of the region, performing the area analysis by FE-EPMA under the conditions of: pixel size 0.34 ?m×0.34 ?m; and number of measured pixels 256×256; and measuring an intensity (?: cps) of a characteristic X ray of an element (Ae) of the alkaline-earth metal and an intensity (?: cps) of a characteristic X ray of Pt for each pixel.Type: GrantFiled: September 9, 2019Date of Patent: November 21, 2023Assignees: CATALER CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Shogo Kawamura, Tomomasa Aikawa, Isao Naito, Hiroki Nihashi, Nobuyuki Takagi, Takeshi Nobukawa
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Patent number: 11719144Abstract: The present disclosure provides an exhaust gas purification catalyst having improved durability, which comprises a substrate and a catalyst coat layer formed on the substrate, the catalyst coat layer having a two-layer structure, wherein the catalyst coat layer includes an upstream portion on an upstream side and a downstream portion on a downstream side in an exhaust gas flow direction, and a part or all of the upstream portion is formed on a part of the downstream portion, wherein the downstream portion contains Rh fine particles, and wherein the Rh fine particles have an average particle size measured by a transmission electron microscope observation of 1.0 nm or more to 2.0 nm or less, and a standard deviation ? of the particle size of 0.8 nm or less.Type: GrantFiled: December 14, 2020Date of Patent: August 8, 2023Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, CATALER CORPORATIONInventors: Norimichi Shimano, Shogo Shirakawa, Masahide Miura, Isao Chinzei, Seiji Nakahigashi, Hiroki Nihashi, Hiromi Togashi, Tomomasa Aikawa, Isao Naito
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Patent number: 11577226Abstract: The present disclosure provides an exhaust gas purification catalyst having an improved Rh activation, which comprises a substrate and a catalyst coat layer formed on the substrate, the catalyst coat layer having a two-layer structure, wherein the catalyst coat layer includes an upstream portion on an upstream side and a downstream portion on a downstream side in an exhaust gas flow direction, and a part or all of the upstream portion is formed on a part of the downstream portion, wherein the upstream portion contains Rh fine particles and Pt, wherein the Rh fine particles have an average particle size measured by a transmission electron microscope observation of 1.0 nm or more to 2.0 nm or less, and a standard deviation ? of the particle size of 0.8 nm or less, and wherein the downstream portion contains Rh.Type: GrantFiled: December 1, 2020Date of Patent: February 14, 2023Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, CATALER CORPORATIONInventors: Seiji Nakahigashi, Isao Chinzei, Shogo Shirakawa, Hiromasa Suzuki, Masahide Miura, Takahiro Nishio, Norimichi Shimano, Hiroki Nihashi, Mitsuyoshi Okada, Takashi Onozuka, Souta Akiyama, Hiromi Togashi, Takahiro Noguchi, Isao Naito
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Patent number: 11426710Abstract: The present disclosure relates to an exhaust gas control catalyst including a base and a catalyst coating layer having a two-layer structure on the base. The catalyst coating layer includes a lower layer on the base, and an upper layer on the lower layer. The upper layer of the catalyst coating layer contains Rh particles in which a mean particle diameter measured by observation using a transmission electron microscope is 1.0 nm or more and 2.0 nm or less and a particle-diameter standard deviation ? is 0.8 nm or less. A length of the upper layer from an end face on a downstream side in an exhaust gas flow direction falls within a range of 70% or more and 100% or less of a total length of the base.Type: GrantFiled: November 4, 2020Date of Patent: August 30, 2022Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, CATALER CORPORATIONInventors: Takahiro Nishio, Shogo Shirakawa, Masahide Miura, Isao Chinzei, Seiji Nakahigashi, Norimichi Shimano, Hiromi Togashi, Hiroki Nihashi, Mitsuyoshi Okada, Takashi Onozuka, Souta Akiyama, Isao Naito
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Patent number: 11400436Abstract: The present disclosure provides an exhaust gas purification catalyst having an improved low-temperature activity, which comprises a substrate and a catalyst coat layer formed on the substrate, wherein the catalyst coat layer contains Rh fine particles and a promoter comprising a Ce—Zr-based composite oxide and a Zr-based composite oxide not containing cerium oxide, wherein the Rh fine particles have an average particle size measured by a transmission electron microscope observation of 1.0 nm or more to 2.0 nm or less, and a standard deviation ? of the particle size of 0.8 nm or less, and wherein the Rh fine particles are supported on each of the Ce—Zr-based composite oxide and the Zr-based composite oxide not containing cerium oxide.Type: GrantFiled: November 30, 2020Date of Patent: August 2, 2022Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, CATALER CORPORATIONInventors: Isao Chinzei, Seiji Nakahigashi, Shogo Shirakawa, Hiromasa Suzuki, Masahide Miura, Takahiro Nishio, Norimichi Shimano, Hiroki Nihashi, Hiromi Togashi, Mitsuyoshi Okada, Takashi Onozuka, Souta Akiyama, Isao Naito
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Publication number: 20220134313Abstract: A supported catalyst particles include oxide carrier particles and noble metal particles supported on the oxide carrier particles, wherein the mass of the noble metal particles is less than or equal to 5 mass % based on the mass of the oxide carrier particles, and the average particle size of the noble metal particles measured by transmission electron microscopy is 1.0-2.0 nm, with the standard deviation ? less than or equal to 0.8 nm.Type: ApplicationFiled: February 12, 2020Publication date: May 5, 2022Applicants: CATALER CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroki NIHASHI, Shogo KAWAMURA, Tomomasa AIKAWA, Isao NAITO, Shogo SHIRAKAWA, Masahide MIURA, Nobuyuki TAKAGI, Norimichi SHIMANO
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Publication number: 20210277814Abstract: An exhaust gas purification catalyst including an alkaline-earth metal carried on a porous carrier in a highly dispersed state. The catalyst layer of the exhaust gas purification catalyst has an alkaline-earth metal carrying region including a porous carrier, Pt, and a sulfuric acid salt of at least one alkaline-earth metal carried on the porous carrier, wherein a value of RAe/Pt is 0.5 or more, where RAe/Pt represents the Pearson's correlation coefficient calculated using ? and ? in each pixel obtained by, for a cross section of the region, performing the area analysis by FE-EPMA under the conditions of: pixel size 0.34 ?m×0.34 ?m; and number of measured pixels 256×256; and measuring an intensity (?: cps) of a characteristic X ray of an element (Ae) of the alkaline-earth metal and an intensity (?: cps) of a characteristic X ray of Pt for each pixel.Type: ApplicationFiled: September 9, 2019Publication date: September 9, 2021Applicants: CATALER CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Shogo KAWAMURA, Tomomasa AIKAWA, Isao NAITO, Hiroki NIHASHI, Nobuyuki TAKAGI, Takeshi NOBUKAWA
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Publication number: 20210205790Abstract: The present disclosure provides an exhaust gas purification catalyst having an improved Rh activation, which comprises a substrate and a catalyst coat layer formed on the substrate, the catalyst coat layer having a two-layer structure, wherein the catalyst coat layer includes an upstream portion on an upstream side and a downstream portion on a downstream side in an exhaust gas flow direction, and a part or all of the upstream portion is formed on a part of the downstream portion, wherein the upstream portion contains Rh fine particles and Pt, wherein the Rh fine particles have an average particle size measured by a transmission electron microscope observation of 1.0 nm or more to 2.0 nm or less, and a standard deviation ? of the particle size of 0.8 nm or less, and wherein the downstream portion contains Rh.Type: ApplicationFiled: December 1, 2020Publication date: July 8, 2021Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, CATALER CORPORATIONInventors: Seiji NAKAHIGASHI, Isao CHINZEI, Shogo SHIRAKAWA, Hiromasa SUZUKI, Masahide MIURA, Takahiro NISHIO, Norimichi SHIMANO, Hiroki NIHASHI, Mitsuyoshi OKADA, Takashi ONOZUKA, Souta AKIYAMA, Hiromi TOGASHI, Takahiro NOGUCHI, Isao NAITO
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Publication number: 20210197176Abstract: The present disclosure provides an exhaust gas purification catalyst having an improved low-temperature activity, which comprises a substrate and a catalyst coat layer formed on the substrate, wherein the catalyst coat layer contains Rh fine particles and a promoter comprising a Ce—Zr-based composite oxide and a Zr-based composite oxide not containing cerium oxide, wherein the Rh fine particles have an average particle size measured by a transmission electron microscope observation of 1.0 nm or more to 2.0 nm or less, and a standard deviation a of the particle size of 0.8 nm or less, and wherein the Rh fine particles are supported on each of the Ce—Zr-based composite oxide and the Zr-based composite oxide not containing cerium oxide.Type: ApplicationFiled: November 30, 2020Publication date: July 1, 2021Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, CATALER CORPORATIONInventors: Isao CHINZEI, Seiji NAKAHIGASHI, Shogo SHIRAKAWA, Hiromasa SUZUKI, Masahide MIURA, Takahiro NISHIO, Norimichi SHIMANO, Hiroki NIHASHI, Hiromi TOGASHI, Mitsuyoshi OKADA, Takashi ONOZUKA, Souta AKIYAMA, Isao NAITO
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Publication number: 20210199037Abstract: The present disclosure provides an exhaust gas purification catalyst having improved durability, which comprises a substrate and a catalyst coat layer formed on the substrate, the catalyst coat layer having a two-layer structure, wherein the catalyst coat layer includes an upstream portion on an upstream side and a downstream portion on a downstream side in an exhaust gas flow direction, and a part or all of the upstream portion is formed on a part of the downstream portion, wherein the downstream portion contains Rh fine particles, and wherein the Rh fine particles have an average particle size measured by a transmission electron microscope observation of 1.0 nm or more to 2.0 nm or less, and a standard deviation a of the particle size of 0.8 nm or less.Type: ApplicationFiled: December 14, 2020Publication date: July 1, 2021Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, CATALER CORPORATIONInventors: Norimichi Shimano, Shogo Shirakawa, Masahide Miura, Isao Chinzei, Seiji Nakahigashi, Hiroki Nihashi, Hiromi Togashi, Tomomasa Aikawa, Isao Naito
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Publication number: 20210197175Abstract: The present disclosure relates to an exhaust gas control catalyst including a base and a catalyst coating layer having a two-layer structure on the base. The catalyst coating layer includes a lower layer on the base, and an upper layer on the lower layer. The upper layer of the catalyst coating layer contains Rh particles in which a mean particle diameter measured by observation using a transmission electron microscope is 1.0 nm or more and 2.0 nm or less and a particle-diameter standard deviation ? is 0.8 nm or less. A length of the upper layer from an end face on a downstream side in an exhaust gas flow direction falls within a range of 70% or more and 100% or less of a total length of the base.Type: ApplicationFiled: November 4, 2020Publication date: July 1, 2021Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, CATALER CORPORATIONInventors: Takahiro NISHIO, Shogo SHIRAKAWA, Masahide MIURA, Isao CHINZEI, Seiji NAKAHIGASHI, Norimichi SHIMANO, Hiromi TOGASHI, Hiroki NIHASHI, Mitsuyoshi OKADA, Takashi ONOZUKA, Souta AKIYAMA, Isao NAITO
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Publication number: 20200391186Abstract: An exhaust gas cleaning catalyst for inhibiting particulates grain growth includes composite metal particulates containing Pd and Rh, where the average proportion of the total Rh atoms relative to the total Pd and Rh atoms is 0.5 atom %, and given an X-ray wavelength of 1.5403 ?, when the diffraction surface in XRD analysis is the crystal lattice face of the Pd(111), and diffraction angles 2? indicating the diffraction peak positions on the diffraction surface are identified, the absolute value of the difference between the theoretical lattice constant B from a formula related to Vegard's law using the identified values, and the actual lattice constant C from a formula related to lattice constants and Bragg's law does not exceed 1.020×10?3 (?). A smaller absolute value of the difference between the theoretical and actual lattice constants is associated with a higher degree to which the Pd and Rh are combined with one another.Type: ApplicationFiled: April 13, 2017Publication date: December 17, 2020Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, CATALER CORPORATIONInventors: Shogo SHIRAKAWA, Masahide MIURA, Toshihiro IKAI, Kosuke IIZUKA, Hiroki NIHASHI, Isao NAITO, Takahiro NAGATA
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Patent number: 10189011Abstract: An exhaust gas purifying catalyst with an excellent effect of suppressing deterioration due to aggregation of a noble metal catalyst during endurance at high temperature, and a production method therefor. The method for producing the exhaust gas purifying catalyst that has a porous carrier and a noble metal catalyst supported thereon includes: preparing the porous carrier that contains alumina-ceria-zirconia composite oxide particles and has physical property values, after subjected to baking at 900° C. for 5 hours, of a pore diameter of the particles in the range of 2 to 20 nm, a specific surface area of the particles in the range of 75 to 115 m2/g, a crystallite size of a ceria-zirconia composite oxide contained in the particles in the range of 4 to 6 nm, and a bulk density of the particles in the range of 0.5 to 0.Type: GrantFiled: September 12, 2017Date of Patent: January 29, 2019Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takaaki Kanazawa, Shunsuke Haga, Isao Naito, Akiya Chiba, Motoya Abe
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Publication number: 20180071718Abstract: An exhaust gas purifying catalyst with an excellent effect of suppressing deterioration due to aggregation of a noble metal catalyst during endurance at high temperature, and a production method therefor. The method for producing the exhaust gas purifying catalyst that has a porous carrier and a noble metal catalyst supported thereon includes: preparing the porous carrier that contains alumina-ceria-zirconia composite oxide particles and has physical property values, after subjected to baking at 900° C. for 5 hours, of a pore diameter of the particles in the range of 2 to 20 nm, a specific surface area of the particles in the range of 75 to 115 m2/g, a crystallite size of a ceria-zirconia composite oxide contained in the particles in the range of 4 to 6 nm, and a bulk density of the particles in the range of 0.5 to 0.Type: ApplicationFiled: September 12, 2017Publication date: March 15, 2018Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, CATALER CORPORATIONInventors: Takaaki KANAZAWA, Shunsuke HAGA, Isao NAITO, Akiya CHIBA, Motoya ABE
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Patent number: 8691721Abstract: A rhodium-loading solution characterized by comprising rhodium atoms and an organic base in a molar ratio of 1:0.5-35.Type: GrantFiled: September 27, 2007Date of Patent: April 8, 2014Assignee: Cataler CorporationInventors: Akiya Chiba, Motoya Abe, Isao Naito
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Publication number: 20100075841Abstract: A rhodium-loading solution characterized by comprising rhodium atoms and an organic base in a molar ratio of 1:0.5-35.Type: ApplicationFiled: September 27, 2007Publication date: March 25, 2010Inventors: Akiya Chiba, Motoya Abe, Isao Naito
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Patent number: 6216452Abstract: An exhaust gas purifying apparatus provides a reflux pipe for connecting an intake pipe to an exhaust pipe and an EGR valve disposed in the reflux pipe for adjusting a flow rate of the exhaust gas flowing through the reflux pipe. A nitrogen oxide purifying catalyst section is formed by a brown miralite type composite oxide. A pair of electrodes are provided on the vicinity of the opposite ends of the purifying catalyst section. A conductivity measuring section measures conductivity of a nitrogen oxide catalyst of the nitrogen oxide purifying catalyst section through the electrodes. A control section controls an opening degree of the EGR valve on the basis of engine rpm, engine load and the conductivity measured in the conductivity measuring section.Type: GrantFiled: April 26, 1999Date of Patent: April 17, 2001Assignee: Isuzu Ceramics Research Institute Co., Ltd.Inventors: Isao Naito, Kazuo Oosumi
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Patent number: 6174835Abstract: An exhaust gas purifying catalyst for use in an oxygen surplus atmosphere, includes a brown millerite composite oxide for directly decomposing and absorbing nitrogen oxide (NOx), and a noble metal-series reducing catalyst disposed on the surface of said brown millerite composite oxide. The brown millerite composite oxide is represented by one of the following formulae: A3-aBaC4-bDbO9, A2-aBaC2-bDbO5, and A1-aBaC2-bDbO4 where A and B are elements selected from the group consisting of Ba, Ca, Sr, Mg and Ce, C and D are elements selected from the group consisting of Y, Dy, Zn, Ti, Mn, Fe, Co, Ni, Cu, Sn, Zr and Nd, a is within the range 0≦a<1, and b is within the range 0≦b<2.Type: GrantFiled: June 10, 1999Date of Patent: January 16, 2001Assignee: Isuzu Ceramics Research Institute Co., Ltd.Inventors: Isao Naito, Kazuo Oosumi, Yasuaki Unno
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Patent number: 6055826Abstract: A refrigerator having a main body; a refrigerating compartment arranged at an upper position in the main body to refrigerate foods; and at least three lower compartments vertically arranged under the refrigerating compartment; wherein at least one of the lower compartments is a freezer compartment for freezing foods, and one of the remaining lower compartments is a vegetable compartment to store vegetables or a switchable compartment to make a temperature zone therein switchable between a freezing temperature zone and a temperature zone for refrigerated foods, vegetables or chilled foods.Type: GrantFiled: September 23, 1998Date of Patent: May 2, 2000Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshie Hiraoka, Isao Naito, Noriyuki Suda, Mutsumi Kato, Hisashi Matsui, Hiroshige Konishi, Katsumasa Sakamoto