Patents by Inventor Kenya Ohashi
Kenya Ohashi 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: 11131400Abstract: Provided is a high-pressure fuel supply pump and a method of manufacturing thereof which can suppress the progress of corrosion and cavitation erosion even when the pressure becomes higher, or when biofuel or a fuel having a high oil content of biofuel is used. Therefore, the high-pressure fuel supply pump includes a discharge valve 51b that discharges fuel, and a discharge valve seat 51a on which the discharge valve 51b is seated. The base material of the discharge valve 51b and the discharge valve seat 51a is a steel material. On the surface of the discharge valve 51b, a Co-based alloy layer 70b and a Cr-enriched portion 70b1 having a higher Cr concentration than the surrounding Co-based alloy layer 70b are formed. The Co-based alloy layer 70a is formed on the surface of the discharge valve seat 51a.Type: GrantFiled: December 7, 2018Date of Patent: September 28, 2021Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Mina Amo, Kenya Ohashi, Arata Kagiyama, Koichi Yamaka, Noriyuki Maekawa
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Publication number: 20200284368Abstract: Provided is a high-pressure fuel supply pump and a method of manufacturing thereof which can suppress the progress of corrosion and cavitation erosion even when the pressure becomes higher, or when biofuel or a fuel having a high oil content of biofuel is used. Therefore, the high-pressure fuel supply pump includes a discharge valve 51b that discharges fuel, and a discharge valve seat 51a on which the discharge valve 51b is seated. The base material of the discharge valve 51b and the discharge valve seat 51a is a steel material. On the surface of the discharge valve 51b, a Co-based alloy layer 70b and a Cr-enriched portion 70b1 having a higher Cr concentration than the surrounding Co-based alloy layer 70b are formed. The Co-based alloy layer 70a is formed on the surface of the discharge valve seat 51a.Type: ApplicationFiled: December 7, 2018Publication date: September 10, 2020Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Mina AMO, Kenya OHASHI, Arata KAGIYAMA, Koichi YAMAKA, Noriyuki MAEKAWA
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Patent number: 10215686Abstract: The objective of the present invention is to provide a corrosion resistance evaluation method and evaluation device that make it possible to estimate crevice corrosion depth and pitting depth in a short period of time. A corrosion resistance evaluation method according to the present invention is characterized in that the surface potential of a metal under evaluation is measured in a state in which the metal is immersed in a usage-environment liquid, the surface potential distribution of the metal is determined, the surface potential differences in the microstructure of the metal are calculated on the basis of the surface potential distribution, and the corrosion rate of crevice corrosion and corrosion rate of pitting are predicted using the maximum surface potential difference from among the calculated surface potential differences as an evaluation index for corrosion evaluation.Type: GrantFiled: July 22, 2013Date of Patent: February 26, 2019Assignee: Hitachi, Ltd.Inventors: Kyoko Hombo, Kenya Ohashi, Masahiro Itoh, Mitsuharu Ikeda, Takeshi Fukuma, Naritaka Kobayashi, Shoichiro Ogata
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Publication number: 20160326657Abstract: The life of a sacrificial anode for use in a pump device, such as a seawater pump, is extended, thus extending the life of a corrosion protection system of the seawater pump device. A pump device includes corrosion system including: a measurement unit located at a portion of a column pipe to be immersed into seawater; and a temperature control device located at an installation site of the pump device. In this corrosion protection system, a sacrificial anode electrically conductive with the column pipe and capable of being controlled in temperature is attached through a heating/cooling unit and a thermal conduction sheet to the column pipe. The temperature control device is configured to control, based on the temperature of the sacrificial anode measured by the measurement unit, the temperature of the sacrificial anode using the heating/cooling unit attached through the thermal conduction sheet to the sacrificial anode.Type: ApplicationFiled: July 28, 2014Publication date: November 10, 2016Applicant: HITACHI, LTD.Inventors: Reo KOBAYASHI, Kenya OHASHI, Masahiro ITOH, Yoshimasa CHIBA, Takayoshi MIYACHI
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Publication number: 20160146719Abstract: The objective of the present invention is to provide a corrosion resistance evaluation method and evaluation device that make it possible to estimate crevice corrosion depth and pitting depth in a short period of time. A corrosion resistance evaluation method according to the present invention is characterized in that the surface potential of a metal under evaluation is measured in a state in which the metal is immersed in a usage-environment liquid, the surface potential distribution of the metal is determined, the surface potential differences in the microstructure of the metal are calculated on the basis of the surface potential distribution, and the corrosion rate of crevice corrosion and corrosion rate of pitting are predicted using the maximum surface potential difference from among the calculated surface potential differences as an evaluation index for corrosion evaluation.Type: ApplicationFiled: July 22, 2013Publication date: May 26, 2016Inventors: Kyoko HOMBO, Kenya OHASHI, Masahiro ITOH, Mitsuharu IKEDA, Takeshi FUKUMA, Naritaka KOBAYASHI, Shoichiro OGATA
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Patent number: 8479970Abstract: Provided is high corrosion resistant equipment for a plant having the lining structure which exhibits high reliability against breaking of a joining portion over a long use period. The high corrosion resistant equipment for a plant includes a lining plate and a support portion which are made of a high corrosion resistance material and a structural material portion made of a steel material or the like. The lining plate and the support portion include a joining portion to which friction stirring is applied. The support portion is assembled into or fastened to the structural material portion by means of the geometrical structure with a gap interposed between the support portion and the structural material portion. Due to such a constitution, high corrosion resistant equipment for a plant having the lining which exhibits high reliability can be acquired.Type: GrantFiled: June 14, 2012Date of Patent: July 9, 2013Assignee: Hitachi, Ltd.Inventors: Ryo Ishibashi, Katsuhito Takahashi, Seunghwan Park, Shinya Imano, Haruo Akahoshi, Kenya Ohashi
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Patent number: 8387255Abstract: The fine pattern mold that includes a roll, a buffer tube with inner peripheral surface is in contact with an outer peripheral surface of the roll, and a stamper tube in which its inner peripheral surface is in contact with an outer peripheral surface of the buffer tube and a fine concave/convex pattern is formed on its outer peripheral surface, wherein the buffer tube has a larger coefficient of linear expansion and a smaller elastic modulus than those of the stamper tube.Type: GrantFiled: November 30, 2011Date of Patent: March 5, 2013Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Masahiko Ogino, Mitsuru Hasegawa, Kenya Ohashi, Akihiro Miyauchi, Hitoshi Suzuki, Toshio Haba, Haruo Akahoshi
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Publication number: 20120321904Abstract: Provided is high corrosion resistant equipment for a plant having the lining structure which exhibits high reliability against breaking of a joining portion over a long use period. The high corrosion resistant equipment for a plant includes a lining plate and a support portion which are made of a high corrosion resistance material and a structural material portion made of a steel material or the like. The lining plate and the support portion include a joining portion to which friction stirring is applied. The support portion is assembled into or fastened to the structural material portion by means of the geometrical structure with a gap interposed between the support portion and the structural material portion. Due to such a constitution, high corrosion resistant equipment for a plant having the lining which exhibits high reliability can be acquired.Type: ApplicationFiled: June 14, 2012Publication date: December 20, 2012Applicant: HITACHI, LTD.Inventors: Ryo Ishibashi, Katsuhito Takahashi, Seunghwan Park, Shinya Imano, Haruo Akahoshi, Kenya Ohashi
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Patent number: 8158048Abstract: A mold for forming a resin pattern using nanoimprint lithography according to the present invention comprises a main mold including a fine pattern of a protrusion and a depression intended to be transferred, and a spacer for forming a space between the protrusion of the fine pattern of the main mold and a transferred object during a transfer of the fine pattern, in which the spacer has a vent passage capable of flowing gas therethrough and has an elasticity against a pressing force during the transfer.Type: GrantFiled: August 30, 2007Date of Patent: April 17, 2012Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Kenya Ohashi, Masahiko Ogino, Akihiro Miyauchi
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Publication number: 20120067507Abstract: The fine pattern mold that includes a roll, a buffer tube with inner peripheral surface is in contact with an outer peripheral surface of the roll, and a stamper tube in which its inner peripheral surface is in contact with an outer peripheral surface of the buffer tube and a fine concave/convex pattern is formed on its outer peripheral surface, wherein the buffer tube has a larger coefficient of linear expansion and a smaller elastic modulus than those of the stamper tube.Type: ApplicationFiled: November 30, 2011Publication date: March 22, 2012Inventors: Masahiko OGINO, Mitsuru Hasegawa, Kenya Ohashi, Akihiro Miyauchi, Hitoshi Suzuki, Toshio Haba, Haruo Akahoshi
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Patent number: 8109752Abstract: An imprinting stamper which can transfer a microscopic pattern to a medium bearing a convex area or local projection, with high accuracy. A convexo-concave pattern is formed on a surface of the imprinting stamper. It includes a pattern layer having the convexo-concave pattern; and a stamper backside layer arranged on a backside of the pattern layer. Young's modulus of the pattern layer is 500 MPa to 10 GPa; and Young's modulus of the stamper backside layer is smaller than Young's modulus of the pattern layer.Type: GrantFiled: June 26, 2008Date of Patent: February 7, 2012Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Kenya Ohashi, Masahiko Ogino, Akihiro Miyauchi
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Patent number: 8083515Abstract: The fine pattern mold comprises: that includes a roll, a buffer tube with inner peripheral surface is in contact with an outer peripheral surface of the roll, and a stamper tube in which its inner peripheral surface is in contact with an outer peripheral surface of the buffer tube and a fine concave/convex pattern is formed on its outer peripheral surface, wherein the buffer tube has a larger coefficient of linear expansion and a smaller elastic modulus than those of the stamper tube.Type: GrantFiled: May 30, 2008Date of Patent: December 27, 2011Assignee: Hitachi Industrial Equipment Systems, Co., Ltd.Inventors: Masahiko Ogino, Mitsuru Hasegawa, Kenya Ohashi, Akihiro Miyauchi, Hitoshi Suzuki, Toshio Haba, Haruo Akahoshi
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Publication number: 20110064962Abstract: An aluminum die casting product which is improved in corrosion resistance and mechanical strength in particular in proof stress, and a reforming method of an aluminum die casting product are provided. The aluminum die casting product according to the present invention contains Si and Cu, and the largest particle of an Al—Cu metallic compound that exists at a crystal grain boundary between Si and Al has a diameter smaller than or equal to 10 ?m. The reforming method of the present invention is applied to an aluminum die casting product that contains Si and Cu, and the aluminum die casting product is heated at a temperature higher than or equals to 150° C. and lower than 250° C.Type: ApplicationFiled: August 20, 2010Publication date: March 17, 2011Inventors: Kenya OHASHI, Takayoshi HIKICHI, Kazumi FUJII
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Publication number: 20090004320Abstract: An imprinting stamper which can transfer a microscopic pattern to a medium bearing a convex area or local projection, with high accuracy. A convexo-concave pattern is formed on a surface of the imprinting stamper. It includes a pattern layer having the convexo-concave pattern; and a stamper backside layer arranged on a backside of the pattern layer. Young's modulus of the pattern layer is 500 MPa to 10 GPa; and Young's modulus of the stamper backside layer is smaller than Young's modulus of the pattern layer.Type: ApplicationFiled: June 26, 2008Publication date: January 1, 2009Inventors: Kenya OHASHI, Masahiko Ogino, Akihiro Miyauchi
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Publication number: 20080299247Abstract: There is provided a fine pattern mold capable of transferring a fine concave/convex pattern accurately without causing deformation of the fine concave/convex pattern itself. The fine patter mold comprises: a roll; a buffer tube whose inner peripheral surface is in contact with an outer peripheral surface of the roll; and a stamper tube in which its inner peripheral surface is in contact with an outer peripheral surface of the buffer tube and a fine concave/convex pattern is formed on its outer peripheral surface, wherein the buffer tube has a larger coefficient of linear expansion and a smaller elastic modulus than those of the stamper tube.Type: ApplicationFiled: May 30, 2008Publication date: December 4, 2008Inventors: Masahiko Ogino, Mitsuru Hasegawa, Kenya Ohashi, Akihiro Miyauchi, Hitoshi Suzuki, Toshio Haba, Haruo Akahoshi
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Publication number: 20080237931Abstract: A mold for forming a resin pattern using nanoimprint lithography according to the present invention comprises a main mold including a fine pattern of a protrusion and a depression intended to be transferred, and a spacer for forming a space between the protrusion of the fine pattern of the main mold and a transferred object during a transfer of the fine pattern, in which the spacer has a vent passage capable of flowing gas therethrough and has an elasticity against a pressing force during the transfer.Type: ApplicationFiled: August 30, 2007Publication date: October 2, 2008Inventors: Kenya Ohashi, Masahiko Ogino, Akihiro Miyauchi
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Publication number: 20060258163Abstract: To provide a metal mold excellent in the mold-release characteristic and the transfer accuracy in a nano-imprint method. By controlling the thickness of a metal oxide film formed in the face of a release agent and a mold, the adhesive amount of the release agent layer formed in the outer layer thereof is adjusted, thereby forming a mold excellent in the mold-release characteristic. The present invention also relates to methods of fabricating molds for nano-imprint, and mold usage on nano-imprinting equipment.Type: ApplicationFiled: February 15, 2006Publication date: November 16, 2006Inventors: Kenya Ohashi, Akihiro Miyauchi, Masahiko Ogino
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Turbine generator and operating method thereof, and nuclear power plant and operating method thereof
Patent number: 6459750Abstract: A turbine generator has a water cooling system for cooling the inside of a stator coil with water, wherein the water cooling system includes a water storage tank for storing water; pipes connecting the water storage tank and the stator coil, the pipes being provided in an inlet side and in an outlet side; a decarbonated air injection unit connected to the inlet side of the pipe by a pipe or a decarbonated air injection unit connected to the water storage tank; a heater for heating the water, the stator coil having an oxide film on a surface in contact with the water, the oxide film being formed before starting operation of the generator by high temperature water injected with the decarbonated air and heated by the heater; and a control unit for effecting control so that the decarbonated air is always and continuously injected into the cooling water during operation of the generator.Type: GrantFiled: June 2, 2000Date of Patent: October 1, 2002Assignee: Hitachi, Ltd.Inventors: Kazutoshi Itoo, Kenya Ohashi, Kazumi Fujii, Takahiko Sano -
Publication number: 20020039528Abstract: A Mg alloy member with an anticorrosive coating free from any environmental load can be produced by using a solution for chemical conversion treatment for anticorrosive coating, which comprises 0.05 to 1 mol/l of an oxoacid compound of heavy metal selected from Mo, W and V and has a pH of 2 to 6 adjusted by sulfuric acid or nitric acid, and is characterized by contacting the surface of Mg alloy preferably containing 2 to 10% Al with the solution, thereby forming a specific oxide film and, if necessary further forming a fluorine-containing organic film on the film, the resulting Mg alloy member being used in electrically driven blowers, note-type personal computers, various household electrical appliances, etc.Type: ApplicationFiled: October 3, 2001Publication date: April 4, 2002Inventors: Tomoya Kato, Takeshi Obana, Mitsuyoshi Shouji, Kazumi Fujii, Kenya Ohashi
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Patent number: 6328530Abstract: A Mg alloy member with an anticorrosive coating free from any enviromental load can be produced by using a solution for chemical conversion treatment for anticorrosive coating, which comprises 0.05 to 1 mol/l of an oxoacid compound of heavy metal selected from Mo, W and V and has a pH of 2 to 6 adjusted by sulfuric acid or nitric acid, and is characterized by contacting the surface of Mg alloy preferably containing 2 to 10% Al with the solution, thereby forming a specific oxide film and, if necessary further forming a fluorine-containing organic film on the film, the resulting Mg alloy member being used in electrically driven blowers, note-type personal computers, various household electrical appliances, etc.Type: GrantFiled: March 3, 1999Date of Patent: December 11, 2001Assignee: Hitachi, Ltd.Inventors: Tomoya Kato, Takeshi Obana, Mitsuyoshi Shouji, Kazumi Fujii, Kenya Ohashi