Patents by Inventor Takafumi Seto
Takafumi Seto 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: 9616369Abstract: An inertial filter to be disposed in the air flow path of a stream of air containing nanoparticles includes plural particle classifying sheets having plural mesh-like holes are disposed in the air flow path. The plural particle classifying sheets are stacked on each other in a manner that a part of at least one of the particle classifying sheets overlaps with the other particle classifying sheet. The inertial filter can adjust a classification diameter by adjusting a shadow area ratio on a projection view obtained by virtually projecting the plural particle classifying sheets from a downstream side to an upstream side of the air flow path.Type: GrantFiled: August 8, 2011Date of Patent: April 11, 2017Assignee: NITTA CORPORATIONInventors: Takuji Ikeda, Yoshio Otani, Masami Furuuchi, Takafumi Seto
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Patent number: 8978490Abstract: An inertial filter is placed in a fluid flow path and equipped with a particle classifying sheet having a plurality of particle classifying holes uniformly arranged. The particle classifying sheet has a sheet area larger than a fluid passage area at a site where the sheet is placed. A part of the sheet is provided in the form of a partition wall dividing the fluid flow path in two sections in a fluid passage direction to allow for classification of particles.Type: GrantFiled: November 2, 2010Date of Patent: March 17, 2015Assignee: Nitta CorporationInventors: Takuji Ikeda, Yoshio Otani, Masami Furuuchi, Takafumi Seto, Masato Mizuno
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Publication number: 20140137523Abstract: An inertial filter to be disposed in the air flow path of a stream of air containing nanoparticles includes plural particle classifying sheets having plural mesh-like holes are disposed in the air flow path. The plural particle classifying sheets are stacked on each other in a manner that a part of at least one of the particle classifying sheets overlaps with the other particle classifying sheet. The inertial filter can adjust a classification diameter by adjusting a shadow area ratio on a projection view obtained by virtually projecting the plural particle classifying sheets from a downstream side to an upstream side of the air flow path.Type: ApplicationFiled: August 8, 2011Publication date: May 22, 2014Applicant: NITTA CORPORATIONInventors: Takuji Ikeda, Yoshio Otani, Masami Furuuchi, Takafumi Seto
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Publication number: 20130086876Abstract: An inertial filter is placed in a fluid flow path and equipped with a particle classifying sheet having a plurality of particle classifying holes uniformly arranged. The particle classifying sheet has a sheet area larger than a fluid passage area at a site where the sheet is placed. A part of the sheet is provided in the form of a partition wall dividing the fluid flow path in two sections in a fluid passage direction to allow for classification of particles.Type: ApplicationFiled: November 2, 2010Publication date: April 11, 2013Applicant: NITTA CORPORATIONInventors: Takuji Ikeda, Yoshio Otani, Masami Furuuchi, Takafumi Seto, Masato Mizuno
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Patent number: 7965487Abstract: A neutralization apparatus comprising an ion generation element employing a novel, high efficiency discharge system capable of generating high concentration ions with a low ozone concentration. In the neutralization apparatus, the ion generation element is a minute electrode ion generation element consisting of a discharge electrode and an induction electrode having minute protrusions arranged in one direction on a plane, and a thin dielectric film sandwiched between them.Type: GrantFiled: March 3, 2006Date of Patent: June 21, 2011Assignees: FISA Corporation, National Institute of Advanced Industrial Science and TechnologyInventors: Takafumi Seto, Makoto Hirasawa, Masaaki Tsuji, Akira Okuyama, Susumu Saito
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Patent number: 7855868Abstract: An aerosol charge neutralizing device simple in structure and easy to maintain, comprising an aerosol passing container that has a conductive material-made tube body constituting an aerosol passing path permitting aerosol to flow therethrough and has an opening pair consisting of openings in pair disposed oppositely across the center line of the tube body and penetrating through the wall surface of the tube body, and insulation tube that has an insulation material-made tube, has a window pair consisting of windows in pair disposed oppositely across the center line of the tube and penetrating through the wall surface of the tube, and is fitted concentrically over the outer surface of the aerosol passing container with the windows coinciding with the openings, a bipolar ionizing element that has a discharge electrode on a dielectric film and is attached to the insulation tube with the windows closed and the discharge electrode exposed to the aerosol passing path, and an outer tube that includes air-tightly theType: GrantFiled: November 21, 2006Date of Patent: December 21, 2010Assignees: Tsukasa Sokken Co., Ltd., National Institute of Advanced Industrial Science and TechnologyInventors: Tsuyoshi Taishi, Tetsuji Koyama, Soon Bark Kwon, Takafumi Seto, Hiromu Sakurai
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Patent number: 7706120Abstract: An ion generating element capable of cost reduction and space saving while exhibiting a high generation efficiency of positive ions and negative ions and stabilized generation capacity with less variation, and an ion generator and a neutralizer employing it. The ion generating element comprises a dielectric body having at least two faces, at least two discharge electrodes arranged on the at least two faces of the dielectric body, and an induction electrode arranged in the dielectric body and subjected to the action of the at least two discharge electrodes and is characterized in that positive ions and negative ions are generated on the body, and ions are generated from the at least two faces of the dielectric body through discharge generated because of the potential difference between the discharge electrode of the ion generating element and the induction electrode when a drive voltage is applied between them.Type: GrantFiled: February 20, 2006Date of Patent: April 27, 2010Assignees: National Institute of Advanced Industrial Science and Technology, FISA CorporationInventors: Takafumi Seto, Makoto Hirasawa, Masaaki Tsuji, Akira Okuyama, Susumu Saito
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Patent number: 7612981Abstract: The present invention is relating to an ion generator and an ionizer, in which the ion generator can obtain stable ion generation even if the electrode and the power supply slightly change, satisfies voltage and frequency conditions for realizing an ozone concentration less than 50 ppb as an allowable concentration.Type: GrantFiled: January 31, 2008Date of Patent: November 3, 2009Assignees: National Institute of Advanced Industrial Science & Technology, FISA CorporationInventors: Takafumi Seto, Makoto Hirasawa, Yasufumi Hozumi, Masaaki Tsuji, Akira Okuyama, Susumu Saito
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Publication number: 20090207548Abstract: An ion generating element capable of cost reduction and space saving while exhibiting a high generation efficiency of positive ions and negative ions and stabilized generation capacity with less variation, and an ion generator and a neutralizer employing it. The ion generating element comprises a dielectric body having at least two faces, at least two discharge electrodes arranged on the at least two faces of the dielectric body, and an induction electrode arranged in the dielectric body and subjected to the action of the at least two discharge electrodes and is characterized in that positive ions and negative ions are generated on the body, and ions are generated from the at least two faces of the dielectric body through discharge generated because of the potential difference between the discharge electrode of the ion generating element and the induction electrode when a drive voltage is applied between them.Type: ApplicationFiled: February 20, 2006Publication date: August 20, 2009Applicants: National Institute of Advanced Industrial Science and Technology, FISA CorporationInventors: Takafumi Seto, Makoto Hirasawa, Masaaki Tsuji, Akira Okuyama, Susumu Saito
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Publication number: 20090047189Abstract: An aerosol charge neutralizing device simple in structure and easy to maintain, comprising an aerosol passing container that has a conductive material-made tube body constituting an aerosol passing path permitting aerosol to flow therethrough and has an opening pair consisting of openings in pair disposed oppositely across the center line of the tube body and penetrating through the wall surface of the tube body, and insulation tube that has an insulation material-made tube, has a window pair consisting of windows in pair disposed oppositely across the center line of the tube and penetrating through the wall surface of the tube, and is fitted concentrically over the outer surface of the aerosol passing container with the windows coinciding with the openings, a bipolar ionizing element that has a discharge electrode on a dielectric film and is attached to the insulation tube with the windows closed and the discharge electrode exposed to the aerosol passing path, and an outer tube that includes air-tightly theType: ApplicationFiled: November 21, 2006Publication date: February 19, 2009Applicants: TSUKASA SOKKEN CO., LTD., National Institute of Advanced Industrial Science and TechnologyInventors: Tsuyoshi Taishi, Tetsuji Koyama, Soon Bark Kwon, Takafumi Seto, Hiromu Sakurai
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Publication number: 20090027825Abstract: A neutralization apparatus comprising an ion generation element employing a novel, high efficiency discharge system capable of generating high concentration ions with a low ozone concentration. In the neutralization apparatus, the ion generation element is a minute electrode ion generation element consisting of a discharge electrode and an induction electrode having minute protrusions arranged in one direction on a plane, and a thin dielectric film sandwiched between them.Type: ApplicationFiled: March 3, 2006Publication date: January 29, 2009Inventors: Takafumi Seto, Makoto Hirasawa, Masaaki Tsuji, Akira Okuyama, Susumu Saito
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Publication number: 20080191146Abstract: The present invention is relating to an ion generator and an ionizer, in which the ion generator can obtain stable ion generation even if the electrode and the power supply slightly change, satisfies voltage and frequency conditions for realizing an ozone concentration less than 50 ppb as an allowable concentration.Type: ApplicationFiled: January 31, 2008Publication date: August 14, 2008Inventors: Takafumi Seto, Makoto Hirasawa, Yasufumi Hozumi, Masaaki Tsuji, Akira Okuyama, Susumu Saito
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Patent number: 7384666Abstract: Fabrication of a quantum dot functional structure having ultra-fine particles homogeneously distributed in a transparent medium includes depositing such particles having a single particle diameter and uniform structure onto a substrate with the transparent medium.Type: GrantFiled: September 9, 2003Date of Patent: June 10, 2008Assignees: Matsushita Electric Industrial Co., Ltd., Japan as represented by Director General of National Institute of Advanced Industrial Science and Technology, Ministry of Economy, Trade and IndustryInventors: Nobuyasu Suzuki, Toshiharu Makino, Yuka Yamada, Takehito Yoshida, Takafumi Seto, Nobuhiro Aya
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Publication number: 20050155910Abstract: A method and an apparatus for separating fine particles of different fine particle sizes, structures, and functions are provided. The method includes the steps of introducing a group of fine particles of different sizes, structures, and functions into an atmosphere of an adsorption fluid; effecting critical adsorption of the adsorption molecular species to specific sites of the fine particles and, subsequently, separating the fine particles according to size, structure, or function based on one of the masses, the particle diameters, the fluid resistances, and the functions of adsorption abilities to a third substance, which have been changed due to the critical adsorption, or at least two of them in combination.Type: ApplicationFiled: January 7, 2003Publication date: July 21, 2005Applicant: Japan Science and Technology AgencyInventors: Hirofumi Shimura, Takafumi Seto, Nobuhiro Aya, Makoto Hirasawa
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Publication number: 20040045341Abstract: Fabrication of a quantum dot functional structure having ultra-fine particles homogeneously distributed in a transparent medium includes depositing such particles having a single particle diameter and uniform structure onto a substrate with the transparent medium.Type: ApplicationFiled: September 9, 2003Publication date: March 11, 2004Applicants: MATSUSHITA RESEARCH INSTITUTE TOKYO, INC., Japan as Rep by Dir Gen of Nat'l Inst of AdvancedInventors: Nobuyasu Suzuki, Toshiharu Makino, Yuka Yamada, Takehito Yoshida, Takafumi Seto, Nobuhiro Aya
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Patent number: 6648975Abstract: The present invention is to fabricate a quantum dot functional structure having ultra-fine particles homogeneously distributed in a transparent medium by efficiently fabricating high-purity ultra-fine particles having a single particle diameter and uniform structure and depositing the ultra-fine particles onto a substrate in conjunction with the transparent medium. For these purposes, an apparatus for fabricating a quantum dot functional structure is provided.Type: GrantFiled: February 16, 2001Date of Patent: November 18, 2003Assignees: Matsushita Electric Industrial Co., Ltd., Agency of Industrial Science and Technology, Ministry of International Trade and IndustryInventors: Nobuyasu Suzuki, Toshiharu Makino, Yuka Yamada, Takehito Yoshida, Takafumi Seto, Nobuhiro Aya
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Publication number: 20010031564Abstract: The present invention is to fabricate a quantum dot functional structure having ultra-fine particles homogeneously distributed in a transparent medium by efficiently fabricating high-purity ultra-fine particles having a single particle diameter and uniform structure and depositing the ultra-fine particles onto a substrate in conjunction with the transparent medium. For these purposes, an apparatus for fabricating a quantum dot functional structure is provided.Type: ApplicationFiled: February 16, 2001Publication date: October 18, 2001Inventors: Nobuyasu Suzuki, Toshiharu Makino, Yuka Yamada, Takehito Yoshida, Takafumi Seto, Nobuhiro Aya