Patents by Inventor Tomoyuki Tada
Tomoyuki Tada 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: 20110128109Abstract: The laminate device of the present invention comprises magnetic layers and coil patterns alternately laminated, the coil patterns being connected in a lamination direction to form a coil, and pluralities of magnetic gap layers being disposed in regions in contact with the coil patterns.Type: ApplicationFiled: February 10, 2011Publication date: June 2, 2011Applicant: HITACHI METALS., LTDInventors: Tomoyuki TADA, Toru UMENO, Yasuharu MIYOSHI
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Patent number: 7910509Abstract: The invention intends to provide a dielectric porcelain composition for use in electronic devices, in which the relative dielectric constant ?r is high, the Qf value is high and, the temperature coefficient ?f can be controlled while maintaining the temperature coefficient ?f at the resonant frequency small and the Qf value high. According to the invention, when, in an LnAlO3—CaTiO3-based dielectric porcelain composition, a molar ratio of LnAlO3 and CaTiO3 is optimized and Al is substituted by a slight amount of Ga, a structure that has an LnAlO3—CaTiO3 solid solution as a main phase and a solid solution of Al—Ga-based oxide as a secondary phase and does not substantially contain ?-Al2O3 in the structure can be obtained, and the temperature coefficient ?f can be controlled while maintaining the temperature coefficient ?f at the resonant frequency small and the Qf value high.Type: GrantFiled: June 24, 2005Date of Patent: March 22, 2011Assignee: Hitachi Metals, Ltd.Inventors: Tomoyuki Tada, Kazuhiro Nishikawa, Kazuya Toji, Kazuhiro Kura, Takeshi Shimada
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Patent number: 7907044Abstract: The laminate device of the present invention comprises magnetic layers and coil patterns alternately laminated, the coil patterns being connected in a lamination direction to form a coil, and pluralities of magnetic gap layers being disposed in regions in contact with the coil patterns.Type: GrantFiled: January 31, 2007Date of Patent: March 15, 2011Assignee: Hitachi Metals, Ltd.Inventors: Tomoyuki Tada, Toru Umeno, Yasuharu Miyoshi
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Patent number: 7892446Abstract: A ferrite material in which Bi2O3 is added at 6% by weight or less, and preferably 4% by weight or less, to a ferrite of Li—Zn—(Mn, Fe) containing a specified amount of Mn. In the ferrite material, change of magnetic permeability under high external stress is extremely small, and a core loss under a compression stress is small. By using this ferrite material, an inductor and transformer having small loss even in a state of being molded with resin can be obtained.Type: GrantFiled: September 12, 2006Date of Patent: February 22, 2011Assignee: Hitachi Metals, Ltd.Inventors: Yasuharu Miyoshi, Tomoyuki Tada
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Publication number: 20110018675Abstract: A sintered ferrite material, which is obtained by adding Bi2O3 in a range from 0.5% by mass to 3% by mass against 100% by mass of a material having a composition formula of (1-x-y-z)(Li0.5Fe0.5)O.xZnO.yFe2O3.zCuO wherein x, y and z satisfy 0.14?x?0.19, 0.48?y<0.5 and 0?z?0.03 and satisfies resistivity equal to or higher than 106 ?m, initial permeability equal to or higher than 200 and saturation magnetic flux density equal to or higher than 430 mT at 23° C. and equal to or higher than 380 mT at 100° C.Type: ApplicationFiled: February 13, 2009Publication date: January 27, 2011Inventors: Tomoyuki Tada, Yasuharu Miyoshi
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Patent number: 7858263Abstract: A solid polymer electrolyte fuel cell comprises: a plurality of electrode structures comprising an anode and a cathode, and polymer electrolyte membrane held between the anode and the cathode, and a plurality of separators for holding the respective electrode structures, with a fuel gas passage for supplying and discharging fuel gas containing hydrogen on a surface opposing the anode; and an oxidant gas passage for supplying and discharging oxidant gas on a surface opposing the cathode. The catalyst layer of the anode comprises a mixture of an ion conductive material, a platinum powder and/or platinum alloy powder and a carbon, the platinum powder and/or platinum alloy powder and carbon substantially exist independently from each other, and the catalyst layer of the cathode comprises a metal support mixture in which the ion conductive material and the electro-conductive material having the supported catalyst material are mixed.Type: GrantFiled: July 14, 2005Date of Patent: December 28, 2010Assignees: Honda Motor Co., Ltd., Tanaka Kikinzoku Kogyo K.K.Inventors: Kaoru Fukuda, Ryoichiro Takahashi, Junji Matsuo, Tomoyuki Tada, Masahiko Inoue, Koichi Matsutani
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Publication number: 20100167908Abstract: The invention intends to provide a dielectric porcelain composition for use in electronic devices, in which the relative dielectric constant ?r is high, the Qf value is high and, the temperature coefficient ?f can be controlled while maintaining the temperature coefficient ?f at the resonant frequency small and the Qf value high. According to the invention, when, in an LnAlO3—CaTiO3-based dielectric porcelain composition, a molar ratio of LnAlO3 and CaTiO2 is optimized and Al is substituted by a slight amount of Ga, a structure that has an LnAlO3—CaTiO3 solid solution as a main phase and a solid solution of Al—Ga-based oxide as a secondary phase and does not substantially contain ?-Al2O3 in the structure can be obtained, and the temperature coefficient ?f can be controlled while maintaining the temperature coefficient ?f at the resonant frequency small and the Qf value high.Type: ApplicationFiled: June 24, 2005Publication date: July 1, 2010Applicant: HITACHI METALS, LTD.Inventors: Tomoyuki Tada, Kazuhiro Nishikawa, Kazuya Toji, Kazuhiro Kura, Takeshi Shimada
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Publication number: 20090057606Abstract: The invention provides a ferrite material (ferrite sintered body, ferrite powders) having a composition formula of (1?x?y?z)(Li0.5Fe0.5)O.xZnO.y(Mn, Fe)2O3.zCuO, wherein x, y, z, and a satisfy 0.175?x?0.29; 0.475?y?0.51; 0.07?z?0.22; and 0.02?a?0.055 in a case of a=Mn/(Mn+Fe). At least one of Co oxide, Co hydroxide, and Co carbonate in an amount of 1 wt. % or less on the basis of CoO may be contained in 100 wt % of the ferrite material. The ferrite material has a normalized impedance ZN of 40000 ?/m or more at 30 MHz and a normalized impedance ZN of 60000 ?/m or more at 100 MHz as well as a specific resistance of 106 ?m or more.Type: ApplicationFiled: August 29, 2008Publication date: March 5, 2009Inventors: Tomoyuki Tada, Yasuharu Miyoshi, Takeshi Yanagihara
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Publication number: 20090051476Abstract: The laminate device of the present invention comprises magnetic layers and coil patterns alternately laminated, the coil patterns being connected in a lamination direction to form a coil, and pluralities of magnetic gap layers being disposed in regions in contact with the coil patterns.Type: ApplicationFiled: January 31, 2007Publication date: February 26, 2009Applicant: HITACHI METALS, LTD.Inventors: Tomoyuki Tada, Toru Umeno, Yasuharu Miyoshi
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Publication number: 20090050840Abstract: A ferrite material in which Bi2O3 is added at 6% by weight or less, and preferably 4% by weight or less, to a ferrite of Li—Zn—(Mn, Fe) containing a specified amount of Mn. In the ferrite material, change of magnetic permeability under high external stress is extremely small, and a core loss under a compression stress is small. By using this ferrite material, an inductor and transformer having small loss even in a state of being molded with resin can be obtained.Type: ApplicationFiled: September 12, 2006Publication date: February 26, 2009Inventors: Yasuharu Miyoshi, Tomoyuki Tada
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Patent number: 7335619Abstract: There is provided a catalyst for a fuel electrode of a solid polymer fuel cell, wherein the catalyst comprises fine precious metal particles loaded on a support composed of an electrically conductive material, and wherein the weight ratio of the fine precious metal particles and the support composed of an electrically conductive material (fine precious metal particles:electrically conductive material) is 60:40 to 95:5; and the fine precious metal particles satisfy the following conditions (a) to (c): (a) the fine precious metal particles contain platinum and ruthenium, and the mixing ratio thereof (platinum:ruthenium) is within a range between 1:1 and 1:3 in terms of molar ratio; (b) the fine precious metal particles have an average particle diameter of 3 to 10 nm; and (c) the fine precious metal particles contain oxygen, and the weight ratio of the fine precious metal particles and oxygen (fine precious metal particles:oxygen) is 86:14 to 96:4.Type: GrantFiled: December 14, 2005Date of Patent: February 26, 2008Assignee: Tanaka Kikinzoku K.K.Inventors: Tomoyuki Tada, Masahiko Inoue, Koichi Matsutani
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Publication number: 20070042242Abstract: The present invention provides a fuel electrode of a solid polymer electrolyte fuel cell for advancing a fuel cell reaction to oxidize the fuel introduced through a diffusion layer, comprising at least one reaction layer which is in contact with a solid polymer electrolyte membrane and advances the fuel cell reaction and at least one water decomposition layer which is in contact with the diffusion layer and electrolyzes the water in the fuel electrode. The layer taking charge of the fuel cell reaction is protected by providing the fuel electrode having a multilayer structure and providing the layer for preferentially performing the electrolysis of the water contained in the fuel or the like. This results in a fuel electrode in which the reduction of the electrode performance will not easily occur even when fuel shortage may be created.Type: ApplicationFiled: October 26, 2006Publication date: February 22, 2007Applicants: Tanaka Kikinzoku Kogyo K.K., Honda Motor Co. Ltd.Inventors: Tomoyuki Tada, Masahiko Inoue
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Patent number: 7147949Abstract: The present invention provides a fuel electrode of a solid polymer electrolyte fuel cell for advancing a fuel cell reaction to oxidize the fuel introduced through a diffusion layer, comprising at least one reaction layer which is in contact with a solid polymer electrolyte membrane and advances the fuel cell reaction and at least one water decomposition layer which is in contact with the diffusion layer and electrolyzes the water in the fuel electrode. The layer taking charge of the fuel cell reaction is protected by providing the fuel electrode having a multilayer structure and providing the layer for preferentially performing the electrolysis of the water contained in the fuel or the like. This results in a fuel electrode in which the reduction of the electrode performance will not easily occur even when fuel shortage may be created.Type: GrantFiled: June 19, 2003Date of Patent: December 12, 2006Assignees: Tanaka Kikinzoku Kogyo K.K., Honda Motor Co., Ltd.Inventors: Tomoyuki Tada, Masahiko Inoue
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Publication number: 20060217265Abstract: There is provided a catalyst for a fuel electrode of a solid polymer fuel cell, wherein the catalyst comprises fine precious metal particles loaded on a support composed of an electrically conductive material, and wherein the weight ratio of the fine precious metal particles and the support composed of an electrically conductive material (fine precious metal particles:electrically conductive material) is 60:40 to 95:5; and the fine precious metal particles satisfy the following conditions (a) to (c): (a) the fine precious metal particles contain platinum and ruthenium, and the mixing ratio thereof (platinum:ruthenium) is within a range between 1:1 and 1:3 in terms of molar ratio; (b) the fine precious metal particles have an average particle diameter of 3 to 10 nm; and (c) the fine precious metal particles contain oxygen, and the weight ratio of the fine precious metal particles and oxygen (fine precious metal particles:oxygen) is 86:14 to 96:4.Type: ApplicationFiled: December 14, 2005Publication date: September 28, 2006Applicant: Tanaka Kikinzoku Kogyo K.K.Inventors: Tomoyuki Tada, Masahiko Inoue, Koichi Matsutani
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Patent number: 7001865Abstract: The present invention is a catalyst for use in a fuel electrode of a polymer solid electrotype fuel cell which is formed by making a carbon powder support platinum and ruthenium thereon, and is characterized in that the loading ratio between platinum and ruthenium is from 1:2.5 to 1:4 (in molar ratio). It is preferable that the loading density of the catalyst is 40 to 70%. Additionally, it is preferable that a carbon powder having a specific surface area of 600 to 1,200 m2/g is used as the carrier supporting the catalyst particles.Type: GrantFiled: April 11, 2003Date of Patent: February 21, 2006Assignee: Tanaka Kikinzoku Kogyo K.K.Inventors: Tomoyuki Tada, Masahiko Inoue
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Publication number: 20060019147Abstract: A solid polymer electrolyte fuel cell comprises: a plurality of electrode structures comprising an anode and a cathode, and polymer electrolyte membrane held between the anode and the cathode, and a plurality of separators for holding the respective electrode structures, with a fuel gas passage for supplying and discharging fuel gas containing hydrogen on a surface opposing the anode; and an oxidant gas passage for supplying and discharging oxidant gas on a surface opposing the cathode. The catalyst layer of the anode comprises a mixture of an ion conductive material, a platinum powder and/or platinum alloy powder and a carbon, the platium powder and/or platinum alloy powder and carbon substantially exist independently from each other, and the catalyst layer of the cathode comproses a metal support mixture in which the ion conductive material and the electro-conductive material having the supported catalyst material are mixed.Type: ApplicationFiled: July 14, 2005Publication date: January 26, 2006Applicants: HONDA MOTOR CO., LTD., TANAKA KIKINZOKU KOGYO K.K.Inventors: Kaoru Fukuda, Ryoichiro Takahashi, Junji Matsuo, Tomoyuki Tada, Masahiko Inoue, Koichi Matsutani
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Patent number: 6847518Abstract: A membrane electrode assembly for a polymer electrolyte fuel cell has a polymer electrolyte membrane, an anode, and a cathode having a catalytic layer and a diffusion layer. The alloy catalyst contains ruthenium in the anode diffusion layer. The assembly has less loss of efficiency, particularly when operated at high potentials.Type: GrantFiled: December 2, 2003Date of Patent: January 25, 2005Assignees: Honda Motor Co., Ltd., Tanaka Kikinzoku Kogyo K.K.Inventors: Kaoru Fukuda, Masaki Tani, Hayato Kaji, Shigeru Inai, Takeshi Muro, Shinya Watanabe, Tomoyuki Tada, Masahiko Inoue
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Publication number: 20040219420Abstract: The present invention is a catalyst for use in a fuel electrode of a polymer solid electrotype fuel cell which is formed by making a carbon powder support platinum and ruthenium thereon, and is characterized in that the loading ratio between platinum and ruthenium is from 1:2.5 to 1:4 (in molar ratio). It is preferable that the loading density of the catalyst is 40 to 70%. Additionally, it is preferable that a carbon powder having a specific surface area of 600 to 1,200 m2/g is used as the carrier supporting the catalyst particles.Type: ApplicationFiled: January 28, 2004Publication date: November 4, 2004Inventors: Tomoyuki Tada, Masahiko Inoue
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Publication number: 20040214058Abstract: The present invention provides a fuel electrode of a solid polymer electrolyte fuel cell for advancing a fuel cell reaction to oxidize the fuel introduced through a diffusion layer, comprising at least one reaction layer which is in contact with a solid polymer electrolyte membrane and advances the fuel cell reaction and at least one water decomposition layer which is in contact with the diffusion layer and electrolyzes the water in the fuel electrode. The layer taking charge of the fuel cell reaction is protected by providing the fuel electrode having a multilayer structure and providing the layer for preferentially performing the electrolysis of the water contained in the fuel or the like. This results in a fuel electrode in which the reduction of the electrode performance will not easily occur even when fuel shortage may be created.Type: ApplicationFiled: June 19, 2003Publication date: October 28, 2004Applicants: Tanaka Kikinzoku Kogyo K.K., Honda Motor Co., Ltd.Inventors: Tomoyuki Tada, Masahiko Inoue
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Publication number: 20040136143Abstract: A membrane electrode assembly for a polymer electrolyte fuel cell has a polymer electrolyte membrane, an anode, and a cathode having a catalytic layer and a diffusion layer. The alloy catalyst contains ruthenium in the anode diffusion layer. The assembly has less loss of efficiency, particularly when operated at high potentials.Type: ApplicationFiled: December 2, 2003Publication date: July 15, 2004Inventors: Kaoru Fukuda, Masaki Tani, Hayato Kaji, Shigeru Inai, Takeshi Muro, Shinya Watanabe, Tomoyuki Tada, Masahiko Inoue