Patents by Inventor Tetsuo Mizumura
Tetsuo Mizumura 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: 20080241514Abstract: A method for forming an electroless plating film on surfaces of various types of polymer members is provided, the electroless plating film being formed economically with high adhesion strength. The method for forming the plating film on the polymer member comprises preparing a polymer member including a metal substance, in an internal portion of the polymer member, which serves as plating catalyst cores, the polymer member having a surface on which the plating film is to be formed and which is inactive to the electroless plating solution at an atmospheric pressure; and forming the plating film on the surface of the polymer member by bringing the polymer member in contact with the electroless plating solution to which the pressurized carbon dioxide has been added.Type: ApplicationFiled: April 2, 2008Publication date: October 2, 2008Applicant: HITACHI MAXELL, LTD.Inventors: Atsushi YUSA, Tetsuya ANO, Yoshiyuki NOMURA, Tetsuo MIZUMURA
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Publication number: 20070264451Abstract: An electroless plating film with high adhesive strength is formed on surfaces of polymer substrates of various kinds, at low cost by providing a method of manufacturing a polymer member, including: preparing a polymer substrate having metallic fine particles impregnated on and inside a surface thereof; bringing pressurized carbon dioxide into contact with the polymer substrate to swell a surface area of the polymer substrate; and bringing an electroless plating solution containing pressurized carbon dioxide and being in a state causing a plating reaction, into contact with the polymer substrate while the surface area of the polymer substrate is swollen, to form a plating film on the polymer substrate.Type: ApplicationFiled: May 8, 2007Publication date: November 15, 2007Applicant: HITACHI MAXELL, LTD.Inventors: Atsushi Yusa, Yoshiyuki Nomura, Tetsuo Mizumura, Hideo Daimon
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Publication number: 20030157373Abstract: A magnetic recording medium of the present invention comprises an MgO layer 2, a first control layer 3, a second control layer 4, a magnetic layer 5, and a protective layer 6 which are provided in this order on a substrate 1. The MgO layer is formed by means of the ECR sputtering method. Accordingly, this layer is crystallized in the hexagonal system, and crystals are successfully oriented in a certain azimuth. Two or more layers of metal control layers are formed on the MgO layer by using materials and compositions so that the difference in lattice constant with respect to the magnetic layer is not more than 5%. Owing to the presence of the control layers, the magnetic layer is epitaxially grown in a well-suited manner while reflecting the structure of the MgO layer, making it possible to realize the orientation of (11.0) of Co which is preferred to perform the high density recording in the magnetic layer.Type: ApplicationFiled: July 11, 2002Publication date: August 21, 2003Inventors: Fumiyoshi Kirino, Nobuyuki Inaba, Kouichirou Wakabayashi, Tomoko Sotani, Teruaki Takeuchi, Tetsuo Mizumura, Harumi Hieida, Tsuyoshi Onuma, Tetsunori Koda, Satoshi Matsunuma
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Patent number: 6367411Abstract: A continuous plasma CVD apparatus, characterized in that frequency of high-frequency bias is in the range of 50-900 KHz, a blocking condenser is provided between a thin film and a high-frequency source so that the product C·f of electrostatic capacity C of the blocking condenser and frequency f of the high-frequency source is 0.02 [F·Hz] or more, and the total of impedances of all the rollers provided in the route of from a substrate unwind roller to a rotating drum is 10 k&OHgr; or more and the total of impedances of all the rollers provided in the route of from the rotating drum to a wind roller is 10 k&OHgr; or more. According to this apparatus, it becomes possible to continuously form a film without causing damage and deterioration of the substrate.Type: GrantFiled: December 3, 1999Date of Patent: April 9, 2002Assignee: Hitachi Maxell, Ltd.Inventors: Yoichi Ogawa, Tetsuo Mizumura, Akira Yano, Hideo Kusada, Takashi Kubota, Michio Asano, Kunio Wakai
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Publication number: 20020011212Abstract: A continuous plasma CVD apparatus, characterized in that frequency of high-frequency bias is in the range of 50-900 KHz, a blocking condenser is provided between a thin film and a high-frequency source so that the product C·f of electrostatic capacity C of the blocking condenser and frequency f of the high-frequency source is 0.02 [F·Hz] or more, and the total of impedances of all the rollers provided in the route of from a substrate unwind roller to a rotating drum is 10 k&OHgr; or more and the total of impedances of all the rollers provided in the route of from the rotating drum to a wind roller is 10 k&OHgr; or more. According to this apparatus, it becomes possible to continuously form a film without causing damage and deterioration of the substrate.Type: ApplicationFiled: December 3, 1999Publication date: January 31, 2002Inventors: YOICHI OGAWA, TETSUO MIZUMURA, AKIRA YANO, HIDEO KUSADA, TAKASHI KUBOTA
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Patent number: 6312524Abstract: A continuous plasma CVD apparatus, characterized in that frequency of high-frequency bias is in the range of 50-900 KHz, a blocking condenser is provided between a thin film and a high-frequency source so that the product C·f of electrostatic capacity C of the blocking condenser and frequency f of the high-frequency source is 0.02 [F·Hz] or more, and the total of impedances of all the rollers provided in the route of from a substrate unwind roller to a rotating drum is 10 k&OHgr; or more and the total of impedances of all the rollers provided in the route of from the rotating drum to a wind roller is 10 k&OHgr; or more. According to this apparatus, it becomes possible to continuously form a film without causing damage and deterioration of the substrate.Type: GrantFiled: December 3, 1999Date of Patent: November 6, 2001Assignee: Hitachi Maxell, Ltd.Inventors: Yoichi Ogawa, Tetsuo Mizumura, Akira Yano, Hideo Kusada, Takashi Kubota, Michio Asano, Kunio Wakai
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Patent number: 6103677Abstract: A lubricant containing a fluorinated dicarboxylic acid of the formula: A.sup.1 --COO--R.sup.1 --Rf--R.sup.2 --OCO--A.sup.2 in which Rf is a divalent perfluoropolyether group; R.sup.1 and R.sup.2 are the same or different and represent a hydrocarbon group; and A.sup.1 and A.sup.2 are the same or different and represent an organic group having a carboxyl group, which allows two solid materials, for example, a magnetic recording medium and a magnetic head, to slide with low wearing at a low friction under various conditions.Type: GrantFiled: February 10, 1999Date of Patent: August 15, 2000Assignee: Hitachi Maxell, Ltd.Inventors: Takahiro Furutani, Sayaka Shinomoto, Tetsuo Mizumura
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Patent number: 6071609Abstract: An organic compound of the formula: R.sub.1 -Z.sub.1 -R.sub.3 -Z.sub.2 -R.sub.2 in which R.sub.1 and R.sub.2 represent a linear, branched or cyclic saturated or unsaturated hydrocarbon group, a polyether group, a polyester group, a polyamide group or a polycarbonate group; Z.sub.1 and Z.sub.2 represent an amide bond, an ether bond, a urethane bond, a urea bond or an amine salt bond formed by a reaction between an acid and an amine; and R.sub.3 is a group of the formula: --(CH.sub.2).sub.x --(CF.sub.2).sub.y --(CH.sub.2).sub.z -- in which x and z are an integer of 1 to 4, and y is an integer of 4 to 34 which is useful as a lubricant to be used, for example in a magnetic recording medium.Type: GrantFiled: January 29, 1998Date of Patent: June 6, 2000Assignee: Hitachi Maxell, Ltd.Inventors: Takahiro Furutani, Hideo Daimon, Sayaka Shinomoto, Kazushi Miyata, Tetsuo Mizumura
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Patent number: 6044792Abstract: A continuous plasma CVD apparatus, characterized in that frequency of high-frequency bias is in the range of 50-900 KHz, a blocking condenser is provided between a thin film and a high-frequency source so that the product C.multidot.f of electrostatic capacity C of the blocking condenser and frequency f of the high-frequency source is 0.02 [F.multidot.Hz] or more, and the total of impedances of all the rollers provided in the route of from a substrate unwind roller to a rotating drum is 10 k.OMEGA. or more and the total of impedances of all the rollers provided in the route of from the rotating drum to a wind roller is 10 k.OMEGA. or more. According to this apparatus, it becomes possible to continuously form a film without causing damage and deterioration of the substrate.Type: GrantFiled: September 10, 1997Date of Patent: April 4, 2000Assignee: Hitachi Maxwell, Ltd.Inventors: Yoichi Ogawa, Tetsuo Mizumura, Akira Yano, Hideo Kusada, Takashi Kubota, Michio Asano, Kunio Wakai
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Patent number: 5750747Abstract: An organic compound of the formula: R.sub.1 --Z.sub.1 --R.sub.3 --Z.sub.2 --R.sub.2 in which R.sub.1 and R.sub.2 represent a linear, branched or cyclic saturated or unsaturated hydrocarbon group, a polyether group, a polyester group, a polyamide group or a polycarbonate group; Z.sub.1 and Z.sub.2 represent an amide bond, an ether bond, a urethane bond, a urea bond or an amine salt bond formed by a reaction between an acid and an amine; and R.sub.3 is a group of the formula: --(CH.sub.2).sub.x --(CF.sub.2).sub.y --(CH.sub.2).sub.z in which x and z are an integer of 1 to 4, and y is an integer of 4 to 34 which is useful as a lubricant to be used, for example in a magnetic recording medium.Type: GrantFiled: December 14, 1995Date of Patent: May 12, 1998Assignee: Hitachi Maxell, Ltd.Inventors: Takahiro Furutani, Hideo Daimon, Sayaka Shinomoto, Kazushi Miyata, Tetsuo Mizumura
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Patent number: 5073449Abstract: A magnetic recording medium comprising a substrate and a ferromagnetic metal layer, wherein the ferromagnetic metal layer includes hydrated amorphous cobalt oxide, a X-ray photoelectron spectra which is characterized in that, in the Co.sub.2p spectrum, a ratio of a peak height at 785.9.+-.0.3 eV to that at 780.0.+-.0.3 eV is 40/100 or less when a background (BG) line is drawn between lower energy side leading edge points of peaks at 780.0.+-.0.3 eV (2p.sub.3/2) and 795.6.+-.0.3 eV (2p.sub.1/2) and, in the O.sub.1s spectrum, a ratio of a peak height at 529.3.+-.0.4 eV to that at 530.8.+-.0.4 eV is from 100:110 to 100:50 when a background line is drawn between the lower energy side leading edge point and the higher energy side leading edge point of a complex peak at 530.5.+-.2.5 eV from which the peaks at 529.3.+-.0.4 eV and 530.8.+-.0.4 are derived by peak synthesis, which has good corrosion and wear resistance.Type: GrantFiled: March 21, 1988Date of Patent: December 17, 1991Assignee: Hitachi Maxell Ltd.Inventors: Hideaki Niimi, Noboru Isoe, Kunio Wakai, Tetsuo Mizumura
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Patent number: 5013594Abstract: There is disclosed an optical information recording medium comprising forming at least a recording or reflecting film on one surface of a substrate, wherein an plasma-polymerized film of a halogen-containing resin is formed on at least one of the surface of the substrate or the outer surface of the recording or reflecting film. The medium may further include an additional UV-curing film which is formed on any of the surface of the substrate or plasma-polymerized film of halogen-containing resin on the surface of the substrate, the recording or reflecting film, or the peripheries of the substrate and protective film.Type: GrantFiled: September 22, 1988Date of Patent: May 7, 1991Assignee: Hitachi Maxwell, Ltd.Inventors: Tetsuo Mizumura, Minoru Ichijo, Ken-ichirou Nakao, Seiichi Matsushima, Yoshitane Tuburaya
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Patent number: 4983455Abstract: The invention provides a magnetic recording medium having a ferromagnetic metallic layer provided on a non-magnetic substrate, and an anticorrosive deposited on said ferromagnetic metallic layer containing a benzotriazole derivative as a main component. A magnetic recording medium is also provided having on a substrate, a ferromagnetic metallic layer containing cobalt as a main component, a passivated cobalt layer on said ferromagnetic metallic layer and an anticorrosive layer on said passivated cobalt layer, said anticorrosive layer comprising at least one anticorrosive selected from benzothiazole derivatives, benzoimidazole derivatives haaving at least one of amino group, nitro group, chlorine and mercapto group as substituent in the benzoimidazole skeleton, benzotriazole, compounds containing nitrosonaphthol as a main component, oxime compounds, phytic acid and its derivatives, quinaldinic acid and its derivatives, quinoline compounds, naphthaldehyde and its derivatives.Type: GrantFiled: February 12, 1988Date of Patent: January 8, 1991Assignee: Hitachi Maxell, Ltd.Inventors: Kunio Wakai, Tetsuo Mizumura
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Patent number: 4826739Abstract: A magnetic recording medium comprising a substrate, a magnetic layer provided thereon, a passivated film formed on the surface of said magnetic layer, and a lubricant-containing back-coat layer whose pH is adjusted to 6.3 or more on the back of said substrate.Type: GrantFiled: July 30, 1987Date of Patent: May 2, 1989Assignee: Hitachi Maxell, Ltd.Inventors: Noboru Isoe, Tetsuo Mizumura, Kunio Wakai