Patents by Inventor Katsuhiro Ota
Katsuhiro Ota 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: 9487715Abstract: Provided is a coal gasifier enabling a reduction in size of a shift reactor by generating hydrogen-rich gasified coal gas. In a coal gasifier (G) generating gasified coal gas by a gasification reaction proceeding in a furnace fed with a gasifiable raw material, such as coal, and a gasifying agent, at least one of water and steam is fed to the furnace as a material accelerating a hydrogen-generating reaction that proceeds simultaneously with the gasification reaction.Type: GrantFiled: January 30, 2015Date of Patent: November 8, 2016Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.Inventors: Takashi Yamamoto, Katsuhiko Yokohama, Yoshinori Koyama, Katsuhiro Ota, Hiromi Ishii
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Publication number: 20150144843Abstract: Provided is a coal gasifier enabling a reduction in size of a shift reactor by generating hydrogen-rich gasified coal gas. In a coal gasifier (G) generating gasified coal gas by a gasification reaction proceeding in a furnace fed with a gasifiable raw material, such as coal, and a gasifying agent, at least one of water and steam is fed to the furnace as a material accelerating a hydrogen-generating reaction that proceeds simultaneously with the gasification reaction.Type: ApplicationFiled: January 30, 2015Publication date: May 28, 2015Inventors: Takashi YAMAMOTO, Katsuhiko YOKOHAMA, Yoshinori KOYAMA, Katsuhiro OTA, Hiromi ISHII
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Patent number: 8615981Abstract: An integrated coal gasification combined cycle facility is provided that can prevent a reduction in power generation efficiency even when low-grade coal having a relatively-high moisture content is used. Included are: a gasification section that gasifies supplied coal; a gas power generation section that generates power by using gas supplied from the gasification section; a steam power generation section that generates power by using the heat of exhaust gas discharged from the gas power generation section; and a coal drying unit that dries the coal by using exhaust heat discharged from the steam power generation section and that supplies the dried coal to the gasification section.Type: GrantFiled: November 6, 2008Date of Patent: December 31, 2013Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Takashi Yamamoto, Katsuhiro Ota, Hiromi Ishii, Yoshinori Koyama, Kimishiro Tokuda, Isao Mochida, Tatsuro Harada
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Patent number: 8601817Abstract: A hydrogen production apparatus which includes: a humidifier (2), which is supplied with a process fluid containing carbon monoxide and mixes the process fluid with steam; a reactor (3), which reacts the humidified process fluid output from the humidifier in the presence of a catalyst, thereby converting the carbon monoxide within the process fluid into carbon dioxide; a first pipe (A) through which high-temperature process fluid flows following reaction in the reactor; a second pipe (B) that supplies makeup water; at least one first heat exchanger (51a, 51b) disposed at one of one or more locations where the first pipe and the second pipe cross each other; and a third pipe (C) that supplies steam generated by heat exchange in the first heat exchanger to other apparatus.Type: GrantFiled: December 9, 2010Date of Patent: December 10, 2013Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Takanori Tsutsumi, Yoshinori Koyama, Katsuhiro Ota, Takashi Fujii, Hiromi Ishii
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Patent number: 8561408Abstract: The amount of high-temperature steam supplied from external equipment is reduced. Provided is a hydrogen production system (1) including a reactor (3) that allows a humidified process fluid output from a humidifier (2) to react in the presence of a catalyst to transform carbon monoxide in the process fluid into carbon dioxide; a second channel (B) through which the high-temperature process fluid that has reacted in the reactor (3) flows; a circulation channel (C) through which excess water in the humidifier (2) is circulated; and a first heat exchanger (7), disposed at an intersection of the circulation channel (C) and the second channel (B), for heat exchange between the high-temperature process fluid that has reacted in the reactor (3) and the fluid circulated through the circulation channel (C).Type: GrantFiled: December 10, 2009Date of Patent: October 22, 2013Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Takanori Tsutsumi, Yoshinori Koyama, Katsuhiro Ota, Takashi Fujii, Takashi Yamamoto, Hiromi Ishii
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Publication number: 20130247465Abstract: A hydrocarbon feedstock gasifier (gasifier) is provided with: a heat transmission surface disposed within a gasification region of a gasifier configured from a pressure vessel for generating produced gas by partially oxidizing coal which is a hydrocarbon feedstock; a heat exchanger disposed on the path of a circulation line for a circulation medium circulating within the heat transmission surface and for exchanging the heat of the circulation medium; and a circulation pump for circulating the circulation medium.Type: ApplicationFiled: January 24, 2012Publication date: September 26, 2013Inventors: Yoshinori Koyama, Takao Hashimoto, Katsuhiro Ota, Hiromi Ishii, Shozo Kaneko
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Publication number: 20120137689Abstract: A hydrogen production apparatus (1) which, in order to improve power generation efficiency, comprises: a humidifier (2), which is supplied with a process fluid containing carbon monoxide and mixes the process fluid with steam; a reactor (3), which reacts the humidified process fluid output from the humidifier (2) in the presence of a catalyst, thereby converting the carbon monoxide within the process fluid into carbon dioxide; a first pipe (A) through which the high-temperature process fluid flows following reaction in the reactor (3); a second pipe (B) that supplies makeup water; at least one first heat exchanger (51a, 51b), each of which is disposed at one of one or more locations where the first pipe (A) and the second pipe (B) cross each other; and a third pipe (C) that supplies the steam generated by heat exchange in the first heat exchanger (51a, 51b) to other apparatus.Type: ApplicationFiled: December 9, 2010Publication date: June 7, 2012Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Takanori Tsutsumi, Yoshinori Koyama, Katsuhiro Ota, Takashi Fujii, Hiromi Ishii
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Publication number: 20110314814Abstract: The amount of high-temperature steam supplied from external equipment is reduced. Provided is a hydrogen production system (1) including a reactor (3) that allows a humidified process fluid output from a humidifier (2) to react in the presence of a catalyst to transform carbon monoxide in the process fluid into carbon dioxide; a second channel (B) through which the high-temperature process fluid that has reacted in the reactor (3) flows; a circulation channel (C) through which excess water in the humidifier (2) is circulated; and a first heat exchanger (7), disposed at an intersection of the circulation channel (C) and the second channel (B), for heat exchange between the high-temperature process fluid that has reacted in the reactor (3) and the fluid circulated through the circulation channel (C).Type: ApplicationFiled: December 10, 2009Publication date: December 29, 2011Applicant: MITSUBISHI HEAVY INDUSTRIES LTD.Inventors: Takanori Tsutsumi, Yoshinori Koyama, Katsuhiro Ota, Takashi Fujii, Takashi Yamamoto, Hiromi Ishii
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Publication number: 20110308230Abstract: Provided is an integrated coal gasification combined cycle apparatus that can operate a coal pulverizer using gas turbine exhaust gas as drying gas even when the concentration of oxygen in the gas turbine exhaust gas to be used as the drying gas is temporarily increased. In the integrated coal gasification combined cycle plant using combustion exhaust gas from a gas turbine as the drying gas for a coal pulverizer and adjusting the temperature of the drying gas by mixing outlet gas from a denitration device installed inside an exhaust gas boiler and outlet gas from the exhaust gas boiler, an auxiliary burner is started when the concentration of oxygen in the drying gas is increased to a predetermined value or more and is installed so as to adjust the concentration of oxygen in the drying gas using the combustion exhaust gas generated thereby.Type: ApplicationFiled: July 7, 2009Publication date: December 22, 2011Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Soken Takase, Katsuhiro Ota, Takao Hashimoto, Tokushi Maruta, Akemi Matsuo, Hiromi Ishii
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Patent number: 8028511Abstract: A gasifying agent supply path A from an axial flow compressor 21 which boosts pressure of a gasifying agent to a gasifying furnace 2 is branched, and a gasifying agent bypass path D having an escaping pressure adjusting valve 23 is provided. The flow quantity or pressure of the gasifying agent supplied to the gasifying furnace 2 from the gasifying agent supply path A can be adjusted according to the degree of opening of the adjusting valve 23 disposed in the gasifying agent bypass path D, whereby providing a control valve in the gasifying agent supply path A is no longer necessary. Thus, pressure loss at the gasifying agent supply path A can be suppressed, and the discharge pressure of the axial flow compressor 21 can be greatly reduced.Type: GrantFiled: January 8, 2008Date of Patent: October 4, 2011Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Yoshinori Hyakutake, Yoshiaki Tsukuda, Takao Hashimoto, Satoshi Uchida, Katsuhiro Ota, Takashi Sonoda
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Publication number: 20110139047Abstract: Provided is an air-blown integrated coal gasification combined cycle power generation system equipped with a carbon-dioxide capturing device, in which the integrated coal gasification combined cycle power generation system eliminates the need for an air separator by obtaining a new carrier source that replaces nitrogen gas serving as a carrier gas for pressurizing and carrying pulverized coal and char. In an integrated coal gasification combined cycle power generation system that employs an air combustion method of using air as an oxidizing agent to generate coal gas in a gasification furnace and that supplies the coal gas to a gas turbine after separating and capturing carbon dioxide from the coal gas in a carbon-dioxide capturing device, a portion of the carbon dioxide separated and captured by the carbon-dioxide capturing device is used as a carrier gas for pulverized coal and char.Type: ApplicationFiled: August 28, 2009Publication date: June 16, 2011Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Soken Takase, Katsuhiro Ota, Takao Hashimoto, Takashi Fujii
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Publication number: 20110126743Abstract: Provided is a gasification furnace apparatus equipped with a supply source of low-oxygen-concentration drying gas that does not require fuel. A coal pulverizer that produces pulverized coal by pulverizing coal, an air separator that separates air into oxygen gas and nitrogen gas, and a gasification furnace that produces product gas by introducing thereinto the pulverized coal and the oxygen gas, are included. By receiving a supply of excess nitrogen gas from the air separator, the air diluted with nitrogen is used as a source of low-oxygen-concentration gas for drying the pulverized coal, and an air heater that heats the source of low-oxygen-concentration gas to a temperature at which drying can be performed is provided.Type: ApplicationFiled: August 28, 2009Publication date: June 2, 2011Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Soken Takase, Katsuhiro Ota, Hiromi Ishii, Takashi Kijima
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Publication number: 20110116979Abstract: Provided is a coal gasifier enabling a reduction in size of a shift reactor by generating hydrogen-rich gasified coal gas. In a coal gasifier generating gasified coal gas by a gasification reaction proceeding in a furnace fed with a gasifiable raw material, such as coal, and a gasifying agent, at least one of water and steam is fed to the furnace as a material accelerating a hydrogen-generating reaction that proceeds simultaneously with the gasification reaction.Type: ApplicationFiled: July 10, 2009Publication date: May 19, 2011Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Takashi Yamamoto, Katsuhiko Yokohama, Yoshinori Koyama, Katsuhiro Ota, Hiromi Ishii
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Publication number: 20100175364Abstract: An integrated coal gasification combined cycle facility is provided that can prevent a reduction in power generation efficiency even when low-grade coal having a relatively-high moisture content is used. Included are: a gasification section that gasifies supplied coal; a gas power generation section that generates power by using gas supplied from the gasification section; a steam power generation section that generates power by using the heat of exhaust gas discharged from the gas power generation section; and a coal drying unit that dries the coal by using exhaust heat discharged from the steam power generation section and that supplies the dried coal to the gasification section.Type: ApplicationFiled: November 6, 2008Publication date: July 15, 2010Applicant: Mitsubishi Heavy Industries, Ltd.Inventors: Takashi Yamamoto, Katsuhiro Ota, Hiromi Ishii, Yoshinori Koyama, Kimishiro Tokuda, Isao Mochida, Tatsuro Harada
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Publication number: 20090165824Abstract: Embodiments of the present invention improve the efficiency of a cleaning process for cleaning a component part of a magnetic disk drive in a magnetic disk drive manufacturing line. According to one embodiment, a magnetic disk part cleaning apparatus is included in a head stack assembly (HSA) cleaning line for cleaning head stack assemblies of magnetic disk drives included in a magnetic disk drive manufacturing line. The magnetic disk part cleaning apparatus is disposed between a HSA assembly line for assembling a head stack assembly, and head disk assembly (HDA) assembly line for assembling a head disk assembly including the head stack assembly and is connected directly to at least either of the HSA assembly line and the HDA assembly line.Type: ApplicationFiled: December 15, 2008Publication date: July 2, 2009Applicant: Hitachi Global Strorage Technologies Netherlands B.V.Inventors: Kazuya Sekiguchi, Hiroyuki Sugimoto, Hirokazu Yamamoto, Akiko Hashi, Katsuhiro Ota, Mieko Kashi, Toshinori Jinoka, Takuya Kambayashi
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Publication number: 20080295480Abstract: A gasifying agent supply path A from an axial flow compressor 21 which boosts pressure of a gasifying agent to a gasifying furnace 2 is branched, and a gasifying agent bypass path D having an escaping pressure adjusting valve 23 is provided. The flow quantity or pressure of the gasifying agent supplied to the gasifying furnace 2 from the gasifying agent supply path A can be adjusted according to the degree of opening of the adjusting valve 23 disposed in the gasifying agent bypass path D, whereby providing a control valve in the gasifying agent supply path A is no longer necessary. Thus, pressure loss at the gasifying agent supply path A can be suppressed, and the discharge pressure of the axial flow compressor 21 can be greatly reduced.Type: ApplicationFiled: January 8, 2008Publication date: December 4, 2008Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Yoshinori Hyakutake, Yoshiaki Tsukuda, Takao Hashimoto, Satoshi Uchida, Katsuhiro Ota, Takashi Sonoda
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Publication number: 20070227563Abstract: Embodiments in accordance with the present invention provide straightening plates at the upstream side of a cleaning tank and a straightening plate at the downstream side of the object to be cleaned. Apertures are arranged in the planes of the respective straightening plates. An aperture ratio of the upstream straightening plates is set larger than the ratio of the downstream straightening plate. For example, the aperture ratio of the upstream straightening plate may be set at a value between 10% and 25%, and the aperture ratio of the downstream straightening plate is set at a value between 2.5% and 10%. With this, the flow of liquid in the cleaning chamber sandwiched between the upstream and downstream straightening plates can be brought to a pseudo-laminar flow. Contaminants separated from the object to be cleaned are moved quickly to the discharge chamber and are removed by a filter.Type: ApplicationFiled: April 2, 2007Publication date: October 4, 2007Applicant: Hitachi Global Storage Technologies Netherlands B. V.Inventors: Hirokazu Yamamoto, Akiko Hashi, Yoshio Yamamoto, Katsuhiro Ota
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Patent number: 6861359Abstract: In order to prevent dusting from a peripheral end portion of a wafer, a semiconductor film formed is removed from at least the entire surface of the backside of the wafer and from the peripheral portion of the wafer by etching at a high etching rate relative to an insulating film present beneath the semiconductor film, to realize a semiconductor apparatus in which the semiconductor film is formed in an integrated circuit pattern region on the face side of the wafer. Thus, the problem of dusting from the peripheral portion of the wafer is obviated, and a semiconductor apparatus with high reliability is realized.Type: GrantFiled: May 20, 2003Date of Patent: March 1, 2005Assignee: Renesas Technology Corp.Inventors: Katsuhiro Ota, Noriyo Tomiyama, Teruhisa Ichise
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Patent number: 6758872Abstract: A polishing slurry prepared by dispersing in a dispersion medium, abrasive grains comprised of a material having a solubility in the dispersion medium at 25° C., of 0.001 g/100 g or higher is used to effectively remove any abrasive grains standing adherent to the surfaces of objects to be polished or the interiors of polishing apparatus after polishing.Type: GrantFiled: March 5, 2001Date of Patent: July 6, 2004Assignee: Hitachi, Ltd.Inventors: Katsuhiro Ota, Akio Saito
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Publication number: 20040026692Abstract: In order to prevent dusting from a peripheral end portion of a wafer, a semiconductor film formed is removed from at least the entire surface of the backside of the wafer and from the peripheral portion of the wafer by etching at a high etching rate relative to an insulating film present beneath the semiconductor film, to realize a semiconductor apparatus in which the semiconductor film is formed in an integrated circuit pattern region on the face side of the wafer.Type: ApplicationFiled: May 20, 2003Publication date: February 12, 2004Inventors: Katsuhiro Ota, Noriyo Tomiyama, Teruhisa Ichise