Patents by Inventor Hirofumi Ohtsuka
Hirofumi Ohtsuka 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: 12194442Abstract: Provided are high-performance gas desulfurizing agent and desulfurizing method each of which has a high desulfurizing ability even at low temperatures and keeps its desulfurizing performance for an extended period of time. The gas desulfurizing agent includes zinc oxide, aluminum oxide, and copper, the desulfurizing agent further including nickel in an amount of 1.0% by mass to 10% by mass and rhenium in an amount of 0.1% by mass to 1.0% by mass. The gas desulfurizing method includes bringing the desulfurizing agent into contact with gas in coexistence of hydrogen to decompose a sulfur compound in the gas and remove the sulfur compound from the gas.Type: GrantFiled: January 16, 2020Date of Patent: January 14, 2025Assignee: Osaka Gas Co., Ltd.Inventors: Shimpei Norioka, Hirofumi Ohtsuka, Takenori Hirano
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Publication number: 20240181435Abstract: Provided is a molded catalyst serving as a methanation catalyst that supports ruthenium as an activated metal, and has high activity at low temperatures, sufficient strength for industrial use, and heat resistance under high temperature and high water vapor pressure conditions. Provided is a carbon dioxide methanation catalyst molded body including an activated alumina molded body, and zirconia and ruthenium supported on the activated alumina molded body, in which the amount of zirconia supported is 3 to 10 parts by mass with respect to 100 parts by mass of the activated alumina molded body, the amount of ruthenium supported is 0.1 to 5 parts by mass per 100 parts by mass of the activated alumina molded body, and the carbon dioxide methanation catalyst molded body is a molded body having a particle diameter of 2 to 20 mm.Type: ApplicationFiled: April 20, 2022Publication date: June 6, 2024Inventors: Hirofumi Ohtsuka, Shimpei Norioka, Akio Hirayama
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Publication number: 20230093127Abstract: Provided is a first step of causing hydrogen and carbon oxide to react with each other in a presence of a first catalyst to obtain a first fuel gas 2 that contains 2% to 10% hydrogen by volume after dehydration; and a second step of consuming the hydrogen in the first fuel gas 2 to obtain a second fuel gas 4 with a reduced hydrogen concentration. The first catalyst includes a methanation catalyst. The second step includes an exothermic reaction that generates heat of 60 kJ or more per mole of hydrogen, and the exothermic reaction is a reaction through which the hydrogen in the first fuel gas 2 and a predetermined reactant 3 are caused to react with each other in a presence of a second catalyst to generate water or a paraffin hydrocarbon with two to four carbon atoms.Type: ApplicationFiled: February 9, 2021Publication date: March 23, 2023Inventors: Hirofumi Ohtsuka, Shimpei Norioka
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Publication number: 20220080398Abstract: Provided are high-performance gas desulfurizing agent and desulfurizing method each of which has a high desulfurizing ability even at low temperatures and keeps its desulfurizing performance for an extended period of time. The gas desulfurizing agent includes zinc oxide, aluminum oxide, and copper, the desulfurizing agent further including nickel in an amount of 1.0% by mass to 10% by mass and rhenium in an amount of 0.1% by mass to 1.0% by mass. The gas desulfurizing method includes bringing the desulfurizing agent into contact with gas in coexistence of hydrogen to decompose a sulfur compound in the gas and remove the sulfur compound from the gas.Type: ApplicationFiled: January 16, 2020Publication date: March 17, 2022Inventors: Shimpei Norioka, Hirofumi Ohtsuka, Takenori Hirano
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Patent number: 10814312Abstract: Provided are a high-performance desulfurizing agent for gases and a gas desulfurization method that provide a high desulfurization performance even at low temperatures and can maintain its desulfurization performance for a long period of time. The desulfurizing agent is characterized in that it includes a zinc oxide, an aluminum oxide and copper, the agent further including nickel by from 1.0 mass % to 10 mass % and ruthenium by from 0.1 mass % to 1.0 mass %. The gas desulfurization method is characterized in that the desulfurizing agent is brought into contact with the gas in the coexistent of hydrogen, thus decomposing/removing sulfur compound contained in the gas.Type: GrantFiled: May 15, 2018Date of Patent: October 27, 2020Assignee: Osaka Gas Co., Ltd.Inventors: Shimpei Norioka, Susumu Takami, Hirofumi Ohtsuka, Takenori Hirano
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Publication number: 20200108371Abstract: Provided are a high-performance desulfurizing agent for gases and a gas desulfurization method that provide a high desulfurization performance even at low temperatures and can maintain its desulfurization performance for a long period of time. The desulfurizing agent is characterized in that it includes a zinc oxide, an aluminum oxide and copper, the agent further including nickel by from 1.0 mass % to 10 mass % and ruthenium by from 0.1 mass % to 1.0 mass %. The gas desulfurization method is characterized in that the desulfurizing agent is brought into contact with the gas in the coexistent of hydrogen, thus decomposing/removing sulfur compound contained in the gas.Type: ApplicationFiled: May 15, 2018Publication date: April 9, 2020Inventors: Shimpei Norioka, Susumu Takami, Hirofumi Ohtsuka, Takenori Hirano
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Publication number: 20160008790Abstract: For implementing a reforming reaction such as steam reforming or autothermal reforming, to obtain hydrogen, carbon monoxide, carbon dioxide, methane, etc. by bringing hydrocarbons and steam into contact with a reforming catalyst, an arrangement is provided to enable reforming of the hydrocarbon to proceed under a stable condition for an extended period thanks to high sulfur resistance thereof. The arrangement employs a reforming catalyst supporting both platinum and iridium on an inorganic oxide support for the reforming of the hydrocarbon.Type: ApplicationFiled: May 28, 2013Publication date: January 14, 2016Inventors: Susumu Takami, Hirofumi Ohtsuka, Takenori Hirano
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Patent number: 9067175Abstract: Disclosed are a method and an apparatus for removing methane from a gas which contains the methane at such a low concentration as not to be rendered into a combustible range with whatever ratio of air mixed therewith. In order to ensure satisfactory methane removal performance even in the coexistence of sulfur compound and in order also to provide stable methane removal performance for an extended period of time without performance deterioration even when the methane concentration varies significantly, the gas is fed to a heat exchanger for preheating and methane is exposed to an oxidation catalyst which oxidizes the methane through contact therewith. Then, the resultant gas is fed again to the heat exchanger for heat recovery through heat exchange with un-reacted gas. Further, the flow rate of gas to be treated is varied, according to a concentration of the methane contained in this treated gas.Type: GrantFiled: September 15, 2010Date of Patent: June 30, 2015Assignee: Osaka Gas Co., Ltd.Inventors: Hirofumi Ohtsuka, Tsutomu Sakai
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Patent number: 8899968Abstract: Disclosed is a system for processing a combustible gas, which comprises a catalytic combusting means for receiving an oxygen-containing combustible gas that contains oxygen in addition to the combustible gas as the principal component thereof, causing this oxygen-containing combustible gas to contact an oxidation catalyst for partial combustion thereof, to produce the resultant partially combusted gas as a compressible combustible gas.Type: GrantFiled: July 22, 2008Date of Patent: December 2, 2014Assignee: Osaka Gas Co., Ltd.Inventors: Kenji Seki, Masataka Masuda, Hirofumi Ohtsuka, Etsuo Shito, Katsuhiko Hirao
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Publication number: 20120189523Abstract: Disclosed are a method and an apparatus for removing methane from a gas which contains the methane at such a low concentration as not to be rendered into a combustible range with whatever ratio of air mixed therewith. In order to ensure satisfactory methane removal performance even in the coexistence of sulfur compound and in order also to provide stable methane removal performance for an extended period of time without performance deterioration even when the methane concentration varies significantly, the gas is fed to a heat exchanger for preheating and methane is exposed to an oxidation catalyst which oxidizes the methane through contact therewith. Then, the resultant gas is fed again to the heat exchanger for heat recovery through heat exchange with un-reacted gas. Further, the flow rate of gas to be treated is varied, according to a concentration of the methane contained in this treated gas.Type: ApplicationFiled: September 15, 2010Publication date: July 26, 2012Applicant: OSAKA GAS CO., LTD.Inventors: Hirofumi Ohtsuka, Tsutomu Sakai
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Publication number: 20100196833Abstract: Disclosed is a system for processing a combustible gas, which comprises a catalytic combusting means for receiving an oxygen-containing combustible gas that contains oxygen in addition to the combustible gas as the principal component thereof, causing this oxygen-containing combustible gas to contact an oxidation catalyst for partial combustion thereof, to produce the resultant partially combusted gas as a compressible combustible gas.Type: ApplicationFiled: July 22, 2008Publication date: August 5, 2010Applicant: OSAKA GAS CO., LTD.Inventors: Kenji Seki, Masataka Masuda, Hirofumi Ohtsuka, Etsuo Shito, Katsuhiko Hirao
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Patent number: 7371706Abstract: A catalyst for removing hydrocarbons from exhaust gas containing methane and an excess of oxygen, which comprises palladium or palladium/platinum supported on at least one carrier selected from zirconia, sulfated zirconia and tungsten-zirconia, and a method for treating exhaust gas using the catalyst.Type: GrantFiled: May 4, 2004Date of Patent: May 13, 2008Assignee: Osaka Gas Company LimitedInventors: Hirofumi Ohtsuka, Takeshi Tabata, Takatoshi Nakahira, Masataka Masuda, Takenori Hirano
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Patent number: 7364712Abstract: This invention provides a catalyst for removing hydrocarbons from a combustion gas containing methane and containing an excess of oxygen, which comprises iridium supported on zirconium oxide; and a method of removing hydrocarbons from a combustion gas containing methane and containing an excess of oxygen, which comprises using this catalyst.Type: GrantFiled: November 15, 2001Date of Patent: April 29, 2008Assignee: Osaka Gas Company LimitedInventors: Hirofumi Ohtsuka, Takenori Hirano
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Patent number: 6887446Abstract: A catalyst for removing hydrocarbons from exhaust gas containing methane and an excess of oxygen, which comprises palladium or palladium/platinum supported on at least one carrier selected from zirconia, sulfated zirconia and tungsten-zirconia, and a method for treating exhaust gas using the catalyst.Type: GrantFiled: June 12, 2003Date of Patent: May 3, 2005Assignee: Osaka Gas Company LimitedInventors: Hirofumi Ohtsuka, Takeshi Tabata, Takatoshi Nakahira, Masataka Masuda, Takenori Hirano
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Publication number: 20050002839Abstract: A catalyst for removing hydrocarbons from exhaust gas containing methane and an excess of oxygen, which comprises palladium or palladium/platinum supported on at least one carrier selected from zirconia, sulfated zirconia and tungsten-zirconia, and a method for treating exhaust gas using the catalyst.Type: ApplicationFiled: July 22, 2004Publication date: January 6, 2005Inventors: Hirofumi Ohtsuka, Takeshi Tabata, Takatoshi Nakahira, Masataka Masuda, Takenori Hirano
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Publication number: 20040235654Abstract: A catalyst for removing hydrocarbons from exhaust gas containing methane and an excess of oxygen, which comprises palladium or palladium/platinum supported on at least one carrier selected from zirconia, sulfated zirconia and tungsten-zirconia, and a method for treating exhaust gas using the catalyst.Type: ApplicationFiled: May 4, 2004Publication date: November 25, 2004Applicant: OSAKA GAS COMPANY LIMITEDInventors: Hirofumi Ohtsuka, Takeshi Tabata, Takatoshi Nakahira, Masataka Masuda, Takenori Hirano
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Patent number: 6788990Abstract: A process control device controls a plurality of processing devices placed in parallel to perform at least two process steps for consecutively processing workpieces in a lot. The process control device includes a device group information for grouping of a plurality of processing devices into a plurality of device groups. For example, when the workpieces are semiconductor devices, processing devices having identical deviating characteristics are grouped into the same group to perform a plurality of photolithographic steps. The process control device further includes a device group selecting unit for selecting the device group such that the lot is processed in the second process step using a processing device included in the same device group as a processing device used in the first process step.Type: GrantFiled: September 7, 2000Date of Patent: September 7, 2004Assignees: Renesas Technology Corp., Ryoden Semiconductor System Engineering CorporationInventors: Taichi Yanaru, Masataka Okabe, Hirofumi Ohtsuka
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Patent number: 6733243Abstract: An interbay transportation system includes bays in which process equipment are provided, stockers provided for the individual bays, and a vehicle traveling through the stockers for transporting a semi-processed product from one of the stockers to another. Timing to start transportation is determined according to the operation status of the process equipment and the number of semi-processed products in the stocker.Type: GrantFiled: April 4, 2002Date of Patent: May 11, 2004Assignees: Renesas Technology Corp., Ryoden Semiconductor System Engineering CorporationInventors: Ryoji Ogata, Hirofumi Ohtsuka, Taichi Yanaru
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Patent number: 6721627Abstract: A conveyance system which performs conveying action operating carrier vehicles, including a loop track, carrier vehicles which run on the track, a station where each carrier vehicle performs loading and unloading of a cargo, and a standby station for storing the carrier vehicles in a standby state. The number of the carrier vehicles to be used is determined from a conveyance command number, and can be automatically determined in correspondence with the load in the conveyance system. Accordingly, even if the load is not uniform but significantly varied, the conveying action can be conducted readily and efficiently.Type: GrantFiled: August 21, 2002Date of Patent: April 13, 2004Assignees: Mitsubishi Denki Kabushiki Kaisha, Ryoden Semiconductor System Engineering CorporationInventors: Syoji Udou, Hirofumi Ohtsuka
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Patent number: 6687568Abstract: A transportation system includes lifts for inter-floor carriage, a carrier cart for intra-floor carriage, and a transit stocker for loading/unloading an article to/from the lift. For each of the lifts, operation status, that is, operating or not, is recorded in a database. The operating rate of each lift, carriage queue for each lift, and an inventory of each transit stocker might also be recorded in the database. When carriage of an article is required, a lift optimum for the carriage is selected from among the lifts based on the information recorded on the database.Type: GrantFiled: April 24, 2002Date of Patent: February 3, 2004Assignees: Mitsubishi Denki Kabushiki Kaisha, Ryoden Semiconductor System Engineering CorporationInventors: Hirofumi Ohtsuka, Ryoji Ogata, Taichi Yanaru