Patents by Inventor Shigeo Ikuta
Shigeo Ikuta 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: 20070202404Abstract: A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte: the porous film being adhered to a surface of at least one of the positive electrode and the negative electrode; the porous film including a filler and a resin binder; the resin binder content in the porous film being 1.5 to 8 parts by weight per 100 parts by weight of the filler; and the resin binder including an acrylonitrile unit, an acrylate unit, or a methacrylate unit.Type: ApplicationFiled: April 26, 2007Publication date: August 30, 2007Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Takashi Takano, Shigeo Ikuta, Kohei Suzuki, Kouji Nishida, Masao Fukunaga, Akiko Fujino
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Publication number: 20070196737Abstract: A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte: the porous film being adhered to a surface of at least one of the positive electrode and the negative electrode; the porous film including a filler and a resin binder; the resin binder content in the porous film being 1.5 to 8 parts by weight per 100 parts by weight of the filler; and the resin binder including an acrylonitrile unit, an acrylate unit, or a methacrylate unit.Type: ApplicationFiled: April 26, 2007Publication date: August 23, 2007Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Takashi Takano, Shigeo Ikuta, Kohei Suzuki, Kouji Nishida, Masao Fukunaga, Akiko Fujino
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Publication number: 20070196738Abstract: A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte: the porous film being adhered to a surface of at least one of the positive electrode and the negative electrode; the porous film including a filler and a resin binder; the resin binder content in the porous film being 1.5 to 8 parts by weight per 100 parts by weight of the filler; and the resin binder including an acrylonitrile unit, an acrylate unit, or a methacrylate unit.Type: ApplicationFiled: April 26, 2007Publication date: August 23, 2007Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Takashi Takano, Shigeo Ikuta, Kohei Suzuki, Kouji Nishida, Masao Fukunaga, Akiko Fujino
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Publication number: 20070117025Abstract: In a secondary battery including a positive electrode, a negative electrode and a porous film bonded to the surface of at least one of the positive electrode and the negative electrode, the porous film includes ceramic particles and a binder, and the ceramic particles include polycrystalline particles obtained by mechanically crushing a fired material comprising a ceramic that is directly synthesized from a ceramic precursor. The porous film has a porosity of 40 to 80%, for example. The porous film can be formed by a method including the steps of: obtaining a fired material comprising a ceramic from a ceramic precursor; obtaining ceramic particles by mechanically crushing the fired material of the ceramic; obtaining a slurry including the ceramic particles and a binder; and applying the slurry onto the surface of an electrode, followed by drying.Type: ApplicationFiled: January 19, 2007Publication date: May 24, 2007Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Shigeo Ikuta, Yusuke Fukumoto
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Publication number: 20070072083Abstract: Disclosed is an electrode for lithium ion secondary batteries which includes an active material layer containing active material particles and a porous insulating layer formed on the surface of the active material layer. The porous insulating layer includes an inorganic filler and a resin binder, and the surface of the active material layer has a first region on which the porous insulating layer is formed, and a second region on which the porous insulating layer is not formed. By using such an electrode, a lithium ion secondary battery can have a high capacity, excellent characteristics and improved safety.Type: ApplicationFiled: December 1, 2004Publication date: March 29, 2007Inventors: Shigeo Ikuta, Tsumoru Ohata
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Publication number: 20070042270Abstract: A secondary battery includes: a positive electrode; a negative electrode; a porous electron-insulating layer adhered to a surface of at least one selected from the group consisting of the positive electrode and the negative electrode; and an electrolyte. The porous electron-insulating layer comprises a particulate filler and a resin binder, and the particulate filler comprises an indefinite-shape particle comprising a plurality of primary particles that are joined to one another. A neck is preferably formed between the primary particles. Since the porous electron-insulating layer has high porosity, it is possible to obtain a secondary battery that exhibits excellent low-temperature characteristics, which are particularly important in actual use, and that is capable of discharging at a large current.Type: ApplicationFiled: February 7, 2005Publication date: February 22, 2007Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Shigeo Ikuta, Yusuke Fukumoto
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Publication number: 20060216608Abstract: A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte: the porous film being adhered to a surface of at least one of the positive electrode and the negative electrode; the porous film including a filler and a resin binder; the resin binder content in the porous film being 1.5 to 8 parts by weight per 100 parts by weight of the filler; and the resin binder including an acrylonitrile unit, an acrylate unit, or a methacrylate unit.Type: ApplicationFiled: July 26, 2004Publication date: September 28, 2006Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Takashi Takano, Shigeo Ikuta, Suzuki Kohei, Kouji Nishida, Masao Fukunaga, Akiko Fujino
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Publication number: 20060194116Abstract: A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte, the porous film being adhered to a surface of at least the negative electrode. The porous film includes an inorganic filler and a first binder: The content of the first binder in the porous film is 1.5 to 8 parts by weight per 100 parts by weight of the filler: The first binder includes a first rubber including an acrylonitrile unit: The first rubber is water-insoluble and has a decomposition temperature of 250° C. or higher. The negative electrode includes a negative electrode active material capable of absorbing and desorbing lithium ion and a second binder, and the second binder includes a second rubber particle and a water-soluble polymer.Type: ApplicationFiled: September 13, 2004Publication date: August 31, 2006Inventors: Kohei Suzuki, Tsumoru Ohata, Junji Nakajima, Akiko Fujino, Shigeo Ikuta, Tetsuya Hayashi, Yusuke Fukumoto, Shinji Kasamatsu
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Publication number: 20060188785Abstract: A non-aqueous electrolyte secondary battery including: a positive electrode; a negative electrode; a separator interposed between the positive electrode and the negative electrode; a non-aqueous electrolyte; and a porous insulating film adhered to a surface of at least one selected from the group consisting of the positive electrode and the negative electrode, the porous insulating film including an inorganic oxide filler and a film binder, wherein the ratio R of actual volume to apparent volume of the separator is not less than 0.4 and not greater than 0.7, and wherein the ratio R and a porosity P of the porous insulating film satisfy the relational formula: ?0.10?R?P?0.30.Type: ApplicationFiled: March 22, 2005Publication date: August 24, 2006Inventors: Kaoru Inoue, Kiyomi Kato, Kohei Suzuki, Shigeo Ikuta, Yusuke Fukumoto, Tetsuya Hayashi
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Publication number: 20060105245Abstract: In a secondary battery including a positive electrode, a negative electrode and a porous film bonded to the surface of at least one of the positive electrode and the negative electrode, the porous film includes ceramic particles and a binder, and the ceramic particles include polycrystalline particles obtained by mechanically crushing a fired material comprising a ceramic that is directly synthesized from a ceramic precursor. The porous film has a porosity of 40 to 80%, for example. The porous film can be formed by a method including the steps of: obtaining a fired material comprising a ceramic from a ceramic precursor; obtaining ceramic particles by mechanically crushing the fired material of the ceramic; obtaining a slurry including the ceramic particles and a binder; and applying the slurry onto the surface of an electrode, followed by drying.Type: ApplicationFiled: December 22, 2005Publication date: May 18, 2006Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Shigeo Ikuta, Yusuke Fukumoto
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Publication number: 20050095505Abstract: A lithium ion secondary battery has an electrode group including: a winding core; and a positive electrode and a negative electrode that are wound around the winding core. This electrode group does not have an independent separator between the positive and negative electrodes. A porous film is integrally formed on both sides of at least one of the positive electrode and the negative electrode. The negative electrode and the positive electrode are connected to the winding core by a negative electrode resin film and a positive electrode resin film, respectively. The use of such resin films makes it possible to reduce the breakage of the porous films and prevent a short-circuit between the positive and negative electrodes.Type: ApplicationFiled: October 27, 2004Publication date: May 5, 2005Inventors: Tsumoru Ohata, Shigeo Ikuta, Akiko Fujino, Tetsuya Hayashi, Kohei Suzuki
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Patent number: 6812490Abstract: The present invention provide an LDD type TFT having excellent properties, particularly for a liquid crystal display unit. For this purpose, a top gate type LDDTFT gate electrode is converted into a two-stage structure by use of a chemical reaction or plating, and furthermore, into a shape in which an upper portion or a lower portion slightly protrudes on the source electrode side, or the drain electrode side relative to the other portions. Impurities are injected by using this electrode having this structure and shape as a mask. Prior to injection of impurities, the gate insulating film is removed, and a Ti film is formed for preventing hydrogen for dilution from coming in. This is also the case with the LDD-TFT on the bottom gate side.Type: GrantFiled: June 30, 2003Date of Patent: November 2, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Shin-itsu Takehashi, Shigeo Ikuta, Tetsuo Kawakita, Mayumi Inoue, Keizaburo Kuramasu
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Publication number: 20040089878Abstract: The present invention provide an LDD type TFT having excellent properties, particularly for a liquid crystal display unit. For this purpose, a top gate type LDDTFT gate electrode is converted into a two-stage structure by use of a chemical reaction or plating, and furthermore, into a shape in which an upper portion or a lower portion slightly protrudes on the source electrode side, or the drain electrode side relative to the other portions. Impurities are injected by using this electrode having this structure and shape as a mask. Prior to injection of impurities, the gate insulating film is removed, and a Ti film is formed for preventing hydrogen for dilution from coming in. This is also the case with the LDD-TFT on the bottom gate side.Type: ApplicationFiled: June 30, 2003Publication date: May 13, 2004Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Shin-Itsu Takehashi, Shigeo Ikuta, Tetsuo Kawakita, Mayumi Inoue, Keizaburo Kuramasu
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Patent number: 6716768Abstract: The invention provides a method of manufacturing a thin-film transistor whose semiconductor surface is protected. The surface of semiconductor formed on a substrate is exposed to ozone-containing water to form a surface-oxidized layer on the surface. A mask formed for etching or ion implantation is removed with the layer formed at least on an exposed portion of the surface.Type: GrantFiled: August 15, 2002Date of Patent: April 6, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventor: Shigeo Ikuta
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Patent number: 6624473Abstract: The present invention provide an LDD type TFT having excellent properties, particularly for a liquid crystal display unit. For this purpose, a top gate type LDDTFT gate electrode is converted into a two-stage structure by use of a chemical reaction or plating, and furthermore, into a shape in which an upper portion or a lower portion slightly protrudes on the source electrode side, or the drain electrode side relative to the other portions. Impurities are injected by using this electrode having this structure and shape as a mask. Prior to injection of impurities, the gate insulating film is removed, and a Ti film is formed for preventing hydrogen for dilution from coming in. This is also the case with the LDD-TFT on the bottom gate side.Type: GrantFiled: November 9, 2000Date of Patent: September 23, 2003Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Shin-itsu Takehashi, Shigeo Ikuta, Tetsuo Kawakita, Mayumi Inoue, Keizaburo Kuramasu
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Publication number: 20030003616Abstract: The invention provides a method of manufacturing a thin-film transistor whose semiconductor surface is protected. The surface of semiconductor formed on a substrate is exposed to ozone-containing water to form a surface-oxidized layer on the surface. A mask formed for etching or ion implantation is removed with the layer formed at least on an exposed portion of the surface.Type: ApplicationFiled: August 15, 2002Publication date: January 2, 2003Inventor: Shigeo Ikuta
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Patent number: 6207341Abstract: According to the present invention, a method for producing a chemically adsorbed film is provided. The method includes the steps of: irradiating a surface of a polymer substrate with ultraviolet laser light so as to produce a hydrophilic group on the surface of the polymer substrate; and contacting a chemical adsorption solution containing a chlorosilane-based chemical adsorbent and a nonaqueous solvent and the polymer substrate on which the hydrophilic group is produced; and reacting the hydrophilic group of the polymer substrate with a chlorosilyl group of the chlorosilane-based chemical adsorbent for forming a covalent bond, thereby forming a chemically adsorbed film on the surface of the polymer substrate.Type: GrantFiled: June 8, 1998Date of Patent: March 27, 2001Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Shigeo Ikuta, Kazufumi Ogawa, Mamoru Soga
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Patent number: 5851726Abstract: According to the present invention, a method for producing a chemically adsorbed film is provided. The method includes the steps of: irradiating a surface of a polymer substrate with ultraviolet laser light so as to produce a hydrophilic group on the surface of the polymer substrate; and contacting a chemical adsorption solution containing a chlorosilane-based chemical adsorbent and a nonaqueous solvent and the polymer substrate on which the hydrophilic group is produced; and reacting the hydrophilic group of the polymer substrate with a chlorosilyl group of the chlorosilane-based chemical adsorbent for forming a covalent bond, thereby forming a chemically adsorbed film on the surface of the polymer substrate.Type: GrantFiled: November 9, 1995Date of Patent: December 22, 1998Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Shigeo Ikuta, Kazufumi Ogawa, Mamoru Soga
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Patent number: 5473933Abstract: A humidity sensor with an excellent water-repelling property is presented by covalently bonding a monomolecular film containing fluoroalkyl groups to the surface of a humidity sensing element, used for the sensor, via siloxane bonding. A chemically adsorbed monomolecular film containing fluoroalkyl groups is formed on the surface of a humidity sensing element via siloxane bonding after dipping and holding the element in a surface active solution such as heptadecafluorotridecyl trichlorosilane, and removing the unreacted material.Type: GrantFiled: August 8, 1994Date of Patent: December 12, 1995Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Mamoru Soga, Shinji Ozaki, Shigeo Ikuta, Kazufumi Ogawa
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Patent number: 5378521Abstract: Members with excellent water- and oil-repelling, and anti-contaminating properties are provided by exposing fillers partially protruding from the surfaces of fiber reinforced plastics or fiber reinforced metals and chemically adsorbing a chlorosilane-based chemical adsorbent to the rough surface of the fiber reinforced plastic or metal substrate. A siloxane-based chemically adsorbed monomolecular film or a polysiloxane chemically adsorbed film is formed on the substrate by chemically adsorbing a chemical adsorbent having numerous chlorosilane groups to the substrate surface. Following that, a chlorosilane-based chemical adsorbent having fluorocarbon groups is chemically adsorbed to the film, thus forming a chemically adsorbed monomolecular or polymer film with water- and oil-repelling properties.Type: GrantFiled: August 20, 1993Date of Patent: January 3, 1995Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Kazufumi Ogawa, Mamoru Soga, Shigeo Ikuta