Patents by Inventor Keiichi Kagawa
Keiichi Kagawa 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: 9464221Abstract: Provided is an alumina sintered body which has a high heat conductivity and a high infrared ray emissivity and is excellent in electrical insulation property and chemical resistance. An alumina sintered body contains cubic aluminum nitride.Type: GrantFiled: February 13, 2015Date of Patent: October 11, 2016Assignee: Atect CorporationInventors: Hiroshi Matsuda, Yoshitaka Fukushima, Yohei Sone, Hirotada Tanimoto, Yusuke Tanaka, Keiichi Kagawa, Norio Kotaka
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Publication number: 20150232733Abstract: Provided is an alumina sintered body which has a high heat conductivity and a high infrared ray emissivity and is excellent in electrical insulation property and chemical resistance. An alumina sintered body contains cubic aluminum nitride.Type: ApplicationFiled: February 13, 2015Publication date: August 20, 2015Inventors: Hiroshi MATSUDA, Yoshitaka FUKUSHIMA, Yohei SONE, Hirotada TANIMOTO, Yusuke TANAKA, Keiichi KAGAWA, Norio KOTAKA
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Patent number: 7833378Abstract: A method of manufacturing an optical disc includes molding a first disc substrate by a first mold simultaneously with a second disc substrate by a second mold while controlling the temperature of the first and second molds by passing a temperature-controlling medium through temperature controlling flow passages provided in the vicinity of a boundary between the first and second molds.Type: GrantFiled: October 25, 2007Date of Patent: November 16, 2010Assignees: Taiyo Yuden Co., Ltd., Nissei Plastic Industrial Co., Ltd.Inventors: Kazunori Ishikura, Keiichi Kagawa, Izumi Igawa, Hidetoshi Egawa, Yuji Shibuya, Shinji Miki, Kiyoto Takizawa
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Publication number: 20080057259Abstract: A method of manufacturing an optical disc includes molding a first disc substrate by a first mold simultaneously with a second disc substrate by a second mold while controlling the temperature of the first and second molds by passing a temperature-controlling medium through temperature controlling flow passages provided in the vicinity of a boundary between the first and second molds.Type: ApplicationFiled: October 25, 2007Publication date: March 6, 2008Inventors: Kazunori ISHIKURA, Keiichi KAGAWA, Izumi IGAWA, Hidetoshi EGAWA, Yuji SHIBUYA, Shinji MIKI, Kiyoto TAKIZAWA
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Patent number: 7303381Abstract: In an optical disc molding device, a heating medium from a low-temperature controller is made to flow in temperature controlling flow passages (passages 3a) formed at locations corresponding to boundary parts of two fixed molds 7 mounted parallel to each other on a fixed platen 3 and in temperature controlling flow passages (passages 6a) formed at locations corresponding to boundary parts of two movable molds 8 mounted parallel to each other on a movable platen 6 to supplement heat exchange.Type: GrantFiled: March 29, 2005Date of Patent: December 4, 2007Assignees: Taiyo Yuden Co., Ltd., Nissei Plastic Industrial Co. Ltd.Inventors: Kazunori Ishikura, Keiichi Kagawa, Izumi Igawa, Hidetoshi Egawa, Yuji Shibuya, Shinji Miki, Kiyoto Takizawa
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Publication number: 20050244751Abstract: In an optical disc molding device, a heating medium from a low-temperature controller is made to flow in temperature controlling flow passages (passages 3a) formed at locations corresponding to boundary parts of two fixed molds 7 mounted parallel to each other on a fixed platen 3 and in temperature controlling flow passages (passages 6a) formed at locations corresponding to boundary parts of two movable molds 8 mounted parallel to each other on a movable platen 6 to supplement heat exchange.Type: ApplicationFiled: March 29, 2005Publication date: November 3, 2005Inventors: Kazunori Ishikura, Keiichi Kagawa, Izumi Igawa, Hidetoshi Egawa, Yuji Shibuya, Shinji Miki, Kiyoto Takizawa
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Patent number: 6569259Abstract: A disposal method of a waste optical disc is useful when a substrate material is collected from the disc. A space is created between a recording layer and a reflective layer between both of which there exists the smallest mutual adhesion by cutting a surface of a protective layer side of an optical disc. Then, the reflective layer and the protective layer are peeled off and removed from the optical disc by introducing air into the space therebetween. Then, the recorded layer remaining on a substrate layer can be removed by cutting.Type: GrantFiled: November 29, 2000Date of Patent: May 27, 2003Assignee: Taiyo Yuden Co., Ltd.Inventor: Keiichi Kagawa
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Patent number: 6428932Abstract: Zinc alloy powder for alkaline batteries containing Bi at a rate of 0.01-0.1% by weight, In at a rate of 0.01-0.1% by weight, Mg at a rate of 0.0005-0.03 % by weight and unavoidable impurities, such as Pb, Cd and Cu, capable of improving high-rate performance and being suitable for using as a cathode active substance for alkaline batteries is provided.Type: GrantFiled: May 19, 2000Date of Patent: August 6, 2002Assignee: Mitsui Mining & Smelting Company, Ltd.Inventors: Mitsuo Shinoda, Keiichi Kagawa, Seiji Fuchino, Kouji Morita, Yoshiaki Tanino, Makoto Matsuo, Akira Oyama
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Patent number: 5498509Abstract: An optical information recording substrate and method of producing the substrate, the substrate having a legible matter formed in a groove area thereof or a pit array area thereof, wherein the legible matter includes a plurality of grooves or pit arrays being partially different in the breadth or depth thereof. The grooves or arrays may be partially dislocated in the radial direction of the optical information recording substrate from a predetermined track. The visually legible matter may include a plurality of laser generated pit arrays wherein remaining portions of the legible matter have a plurality of continuous grooves formed therein. The legible matter may also include a plurality of continuous grooves wherein remaining portions of the legible matter includes a plurality of laser generated pit arrays formed therein.Type: GrantFiled: November 9, 1994Date of Patent: March 12, 1996Assignee: Taiyo Yuden Co., Ltd.Inventors: Yuaki Shin, Takashi Ishiguro, Emiko Hamada, Keiichi Kagawa
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Patent number: 5398231Abstract: An optical information recording substrate having a legible matter formed in a groove area thereof or a pit array area thereof, wherein the legible matter includes a plurality of grooves or pit arrays being partially different in the breadth or depth thereof. The grooves or arrays may be partially dislocated in the radial direction of the optical information recording substrate from a predetermined track. The visually legible matter may include a plurality of laser generated pit arrays wherein remaining portions of the legible matter have a plurality of continuous grooves formed therein. The legible matter may also include a plurality of continuous grooves wherein remaining portions of the legible matter includes a plurality of laser generated pit arrays formed therein.Type: GrantFiled: November 15, 1991Date of Patent: March 14, 1995Assignee: Taiyo Yuden Co., Ltd.Inventors: Yuaki Shin, Takashi Ishiguro, Emiko Hamada, Keiichi Kagawa
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Patent number: 5273914Abstract: An ion implantation stopper is formed on a gate electrode extending on a substrate. When ions are implanted into the substrate to form an LDD layer or source and drain regions in the substrate, the stopper functions to prevent the gate electrode from being exposed to ion implantation. The prevention of the exposure of the gate electrode to the ion implantation ensures the prevention of channeling in the gate electrode. The invention includes forming a first protective film on the gate of an NMOS, implanting to form LDD region for the NMOS, implanting to form source and drain regions of a PMOS, forming a second protective film on the gate of the NMOS, implanting to form source and drain regions of the NMOS, the first and second protective films prevent the gate electrode of the NMOS from being exposed to ion implantation during the respective implanting steps so that channeling is prevented from occurring in the gate electrode of the NMOS.Type: GrantFiled: June 19, 1992Date of Patent: December 28, 1993Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Akio Miyajima, Keiichi Kagawa, Akihira Shinohara, Kiyoyuki Morita, Takashi Uehara
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Patent number: 5092937Abstract: Semiconductors are treated with such surface-treating solutions as ultra-pure water, dilute hydrofluoric acid and an organic solvent and then subjected to removal of the surface-treating solutions remaining on the surface of the semiconductor in an inert gas atmosphere of high purity while contacting the surface of the surface-treated semiconductor only with the inert gas of high purity, whereby contamination with impurities on atom level from the atmosphere can be prevented.Type: GrantFiled: July 13, 1990Date of Patent: March 3, 1992Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Mototsugu Ogura, Keiichi Kagawa, Yuichi Hirofuji
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Patent number: 5030582Abstract: An ion implantation stopper is formed on a gate electrode extending on a substrate. When ions are implanted into the substrate to form an LDD layer or source and drain regions in the substrate, the stopper functions to prevent the gate electrode from being exposed to ion implantation. The prevention of the exposure of the gate electrode to the ion implantation ensures the prevention of channeling in the gate electrode.Type: GrantFiled: October 6, 1989Date of Patent: July 9, 1991Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Akio Miyajima, Keiichi Kagawa, Akihira Shinohara, Kiyoyuki Morita, Takashi Uehara
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Patent number: 4861688Abstract: This invention uses as the anode active material a zinc alloy containing Ni, at least one element selected from In, Pb, Ga and Cd and, optionally further, one element selected from Al, Mg, Ca, Ba and Sr for the anode of a conventional zinc-alkaline battery which employs zinc as the anode active material, aqueous alkaline solution as the electrolyte, and manganese dioxide, silver oxide, oxygen and so forth as the cathode active material. The use of such zinc alloy permits the reduction of the amount of mercury to be used for amalgamation of the anode zinc surface which is made for the purpose of corrosion inhibition, thereby enabling the provision of a low-pollution zinc-alkaline battery.Type: GrantFiled: March 19, 1987Date of Patent: August 29, 1989Assignees: Matsushita Electric Indus. Co. Ltd., Mitsui Mining & Smelting Co., Ltd.Inventors: Akira Miura, Kanji Takata, Ryoji Okazaki, Toyohide Uemura, Keiichi Kagawa
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Patent number: 4812374Abstract: An anode active material of zinc powder with indium coexisting therewith, the metals being amalgamated, an alkaline cell using the anode active material therein, and a method for the production of the anode active material or the alkaline cell.Type: GrantFiled: March 28, 1983Date of Patent: March 14, 1989Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Keiichi Kagawa, Kiyoshi Taniyasu
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Patent number: 4465705Abstract: A method of masking semiconductor devices provided with selectively formed oxide film patterns, can be made by very precisely copying from selective oxidation mask patterns.The method in accordance with the present invention comprisesa first step of forming an anti-oxidation film pattern in a semiconductor body, with at least brim portions of said anti-oxidation film pattern buried therein, anda second step of oxidizing regions on a surface of said semiconductor body to form oxidized regions by use of said anti-oxidation film pattern as a selective oxidation mask, thereby forming at least a part of said oxidized regions of said semiconductor body in a manner to have their bottom disposed deeper than that of said anti-oxidation film pattern in said semiconductor body.Type: GrantFiled: February 14, 1983Date of Patent: August 14, 1984Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Takeshi Ishihara, Keiichi Kagawa