Patents by Inventor Yutaka Naito
Yutaka Naito 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).
-
Publication number: 20060038651Abstract: A coil-embedded dust core of the present invention is provided with a molded coil component including a coil main body having a structure in which a flat type conductor wire is wound edgewise, one end side terminal portion disposed by being lead in the thickness direction of the coil main body, the other end side terminal portion, one end side leading electrode portion disposed by extending the one end side terminal portion, and the other end side leading electrode portion disposed by extending the other end side terminal portion; and a dust core composed of a soft magnetic alloy powder disposed covering the coil main body, the one end side terminal portion, and the other end side terminal portion of the molded coil component.Type: ApplicationFiled: August 16, 2005Publication date: February 23, 2006Inventors: Takao Mizushima, Yutaka Naito, Kazuo Aoki, Hidetaka Kemmotsu, Satoshi Watabe
-
Publication number: 20050236071Abstract: An amorphous soft magnetic alloy powder which is produced by a water atomization method is provided. The powder contains an amorphous phase having a temperature interval ?Tx of a supercooled liquid of 20K or more; having a hardness Hv of 1000 or less; is provided with a layer with a high concentration of Si at a surface portion thereof; and being represented by the following composition formula: Fe100-a-b-x-y-z-w-tCOaNibMxPyCzBwSit And M is one or two or more elements selected from Cr, Mo, W, V, Nb, Ta, Ti, Zr, Hf, Pt, Pd, and Au.Type: ApplicationFiled: April 21, 2005Publication date: October 27, 2005Inventors: Hisato Koshiba, Hidetaka Kenmotsu, Yutaka Naito, Takao Mizushima
-
Patent number: 6897718Abstract: A magnetic powder core comprises a molded article of a mixture of a glassy alloy powder and an insulating material. The glassy alloy comprises Fe and at least one element selected from Al, P, C, Si, and B, and has a texture primarily composed of an amorphous phase. The glassy alloy exhibits a temperature difference ?Tx, which is represented by the equation ?Tx=Tx?Tg, of at least 20 K in a supercooled liquid, wherein Tx indicates the crystallization temperature and Tg indicates the glass transition temperature. The magnetic core precursor is produced mixing the glassy alloy powder with the insulating material, compacting the mixture to form a magnetic core precursor, and annealing the magnetic core precursor at a temperature in the range between (Tg?170) K and Tg K to relieve the internal stress of the magnetic core precursor. The glassy alloy exhibits low coercive force and low core loss.Type: GrantFiled: May 20, 2003Date of Patent: May 24, 2005Assignee: Alps Electric Co., Ltd.Inventors: Shoji Yoshida, Hidetaka Kenmotsu, Takao Mizushima, Kazuaki Ikarashi, Yutaka Naito
-
Patent number: 6750723Abstract: A magnetic powder core comprises a molded article of a mixture of a glassy alloy powder and an insulating material. The glassy alloy comprises Fe and at least one element selected from Al, P, C, Si, and B, and has a texture primarily composed of an amorphous phase. The glassy alloy exhibits a temperature difference &Dgr;Tx, which is represented by the equation &Dgr;Tx=Tx−Tg, of at least 20 K in a supercooled liquid, wherein Tx indicates the crystallization temperature and Tg indicates the glass transition temperature. The magnetic core precursor is produced mixing the glassy alloy powder with the insulating material, compacting the mixture to form a magnetic core precursor, and annealing the magnetic core precursor at a temperature in the range between (Tg−170) K and Tg K to relieve the internal stress of the magnetic core precursor. The glassy alloy exhibits low coercive force and low core loss.Type: GrantFiled: May 20, 2003Date of Patent: June 15, 2004Assignee: Alps Electric Co., Ltd.Inventors: Shoji Yoshida, Takao Mizushima, Yutaka Naito
-
Publication number: 20030205295Abstract: A magnetic powder core comprises a molded article of a mixture of a glassy alloy powder and an insulating material. The glassy alloy comprises Fe and at least one element selected from Al, P, C, Si, and B, and has a texture primarily composed of an amorphous phase. The glassy alloy exhibits a temperature difference &Dgr;Tx, which is represented by the equation &Dgr;Tx=Tx−Tg, of at least 20 K in a supercooled liquid, wherein Tx indicates the crystallization temperature and Tg indicates the glass transition temperature. The magnetic core precursor is produced mixing the glassy alloy powder with the insulating material, compacting the mixture to form a magnetic core precursor, and annealing the magnetic core precursor at a temperature in the range between (Tg−170) K and Tg K to relieve the internal stress of the magnetic core precursor. The glassy alloy exhibits low coercive force and low core loss.Type: ApplicationFiled: May 20, 2003Publication date: November 6, 2003Inventors: Shoji Yoshida, Hidetaka Kenmotsu, Takao Mizushima, Kazuaki Ikarashi, Yutaka Naito
-
Publication number: 20030201032Abstract: A magnetic powder core comprises a molded article of a mixture of a glassy alloy powder and an insulating material. The glassy alloy comprises Fe and at least one element selected from Al, P, C, Si, and B, and has a texture primarily composed of an amorphous phase. The glassy alloy exhibits a temperature difference &Dgr;Tx, which is represented by the equation &Dgr;Tx=Tx−Tg, of at least 20 K in a supercooled liquid, wherein Tx indicates the crystallization temperature and Tg indicates the glass transition temperature. The magnetic core precursor is produced mixing the glassy alloy powder with the insulating material, compacting the mixture to form a magnetic core precursor, and annealing the magnetic core precursor at a temperature in the range between (Tg−170) K and Tg K to relieve the internal stress of the magnetic core precursor. The glassy alloy exhibits low coercive force and low core loss.Type: ApplicationFiled: May 20, 2003Publication date: October 30, 2003Inventors: Shoji Yoshida, Hidetaka Kenmotsu, Takao Mizushima, Kazuaki Ikarashi, Yutaka Naito
-
Patent number: 6594157Abstract: A magnetic powder core comprises a molded article of a mixture of a glassy alloy powder and an insulating material. The glassy alloy comprises Fe and at least one element selected from Al, P, C, Si, and B, and has a texture primarily composed of an amorphous phase. The glassy alloy exhibits a temperature difference &Dgr;Tx, which is represented by the equation &Dgr;Tx=Tx−Tg, of at least 20 K in a supercooled liquid, wherein Tx indicates the crystallization temperature and Tg indicates the glass transition temperature. The magnetic core precursor is produced mixing the glassy alloy powder with the insulating material, compacting the mixture to form a magnetic core precursor, and annealing the magnetic core precursor at a temperature in the range between (Tg−170) K and Tg K to relieve the internal stress of the magnetic core precursor. The glassy alloy exhibits low coercive force and low core loss.Type: GrantFiled: March 15, 2001Date of Patent: July 15, 2003Assignee: Alps Electric Co., Ltd.Inventors: Shoji Yoshida, Hidetaka Kenmotsu, Takao Mizushima, Kazuaki Ikarashi, Yutaka Naito
-
Publication number: 20020053876Abstract: A gas-discharge display panel is manufactured by sealing up a front substrate and a rear substrate by a sealing member. A relationship of Tg≧Tf exists between a glass transition point Tg of a dielectric substance formed on the front substrate and a temperature Tf at which the front substrate and the rear substrate are sealed up.Type: ApplicationFiled: August 6, 1998Publication date: May 9, 2002Inventors: MICHIFUMI KAWAI, RYOHEI SATOH, SHOICHI IWANAGA, SHIGEAKI SUZUKI, KAZUO SUZUKI, SHIGEHISA MOTOWAKI, YOSHIHIRO KATO, YUTAKA NAITO
-
Patent number: 6351204Abstract: A thin magnetic element comprising a coil pattern formed on at least one side of a substrate and a thin magnetic film formed on the coil pattern, wherein, assuming that the thickness and width of a coil conductor constituting the coil pattern are t and a, respectively, an aspect ratio t/a of the coil conductor satisfies the relationship 0.035≦t/a≦0.35, and the thin magnetic film has a resistivity of 400 &mgr;&OHgr;cm or more.Type: GrantFiled: May 2, 2000Date of Patent: February 26, 2002Assignee: Alps Electric Co., Ltd.Inventors: Kiyohito Yamasawa, Yasuo Hayakawa, Takashi Hatanai, Akihiro Makino, Yutaka Naito, Naoya Hasegawa
-
Patent number: 6337376Abstract: A method to prepare a polyolefin in the presence of a catalyst comprising: (A) a solid catalyst component prepared by reacting a homogenous solution consisting of (i) at least one member selected from the group consisting of metal magnesium and a hydroxylated organic compound, and oxygen-containing organic compounds of magnesium, (ii) at least one oxygen-containing organic compound of titanium and (iii) at least one silicon compound, first with (iv) at least one first organoaluminum halide compound of the formula: AlR5zX3−z wherein R5 is a hydrocarbon group having from 1 to 20 carbon atoms, X is a halogen atom, and 1≦z≦2, and wherein the atomic ratio of gram atoms of Al in the component (iv) to gram atoms of Mg in the component (i) (Al/Mg) is from 0.1 to 2.Type: GrantFiled: November 21, 1994Date of Patent: January 8, 2002Assignee: Tosoh CorporationInventors: Yutaka Naito, Fumiharu Takahashi, Mitsuhiro Mori, Yozo Kondo
-
Patent number: 6320003Abstract: A method for producing a polyolefin in the presence of a catalyst comprising a transition metal compound and an organometallic compound, wherein a catalyst system is used which comprises (A) a solid catalyst component prepared by reacting a homogeneous solution containing (I) at least one member selected from the group consisting of metal magnesium and a hydroxylated organic compound, and oxygen-containing organic compounds of magnesium, (II) at least one zirconium compound selected from the group consisting of oxygen-containing organic compounds and halogen-containing compounds of zirconium, and (III) at least one silicon compound selected from the group consisting of polysiloxanes and silanes, with (IV) at least one organoaluminum halide compound to obtain a solid product, isolating the solid product, and reacting this solid product with (V) at least one halogen-containing compound of titanium, and (B) at least one catalyst component selected from the group consisting of organoaluminum compounds.Type: GrantFiled: November 10, 1994Date of Patent: November 20, 2001Assignee: Tosoh CorporationInventors: Sadaki Nishimura, Yutaka Naito, Mitsuhiro Mori, Yozo Kondo
-
Publication number: 20010036084Abstract: A magnetic powder core comprises a molded article of a mixture of a glassy alloy powder and an insulating material. The glassy alloy comprises Fe and at least one element selected from Al, P, C, Si, and B, and has a texture primarily composed of an amorphous phase. The glassy alloy exhibits a temperature difference &Dgr;Tx, which is represented by the equation &Dgr;Tx=Tx−Tg, of at least 20 K in a supercooled liquid, wherein Tx indicates the crystallization temperature and Tg indicates the glass transition temperature. The magnetic core precursor is produced mixing the glassy alloy powder with the insulating material, compacting the mixture to form a magnetic core precursor, and annealing the magnetic core precursor at a temperature in the range between (Tg−170) K and Tg K to relieve the internal stress of the magnetic core precursor. The glassy alloy exhibits low coercive force and low core loss.Type: ApplicationFiled: March 15, 2001Publication date: November 1, 2001Applicant: Alps Electric Co., Ltd.Inventors: Shoji Yoshida, Hidetaka Kenmotsu, Takao Mizushima, Kazuaki Ikarashi, Yutaka Naito
-
Patent number: 6239594Abstract: A magnet layer or antiferromagnetic thin film layer composed of a thin film serving as a bias magnetic field applying member is provided at both ends of a magnetic thin film having a magneto-impedance effect so that a bias magnetic field Hbi is applied to the magnetic thin film layer in parallel with the direction of application of an external magnetic field Hex to the magnetic thin film layer. As the magnetic thin film layer, a soft magnetic material having the composition ColTamHfn, FehRiOl, (Co1-vTv)xMyOzXw, T100-d-e-f-gXdMeZfQg or T100-p-q-f-gSipAlqMeZfQg is used.Type: GrantFiled: September 22, 1999Date of Patent: May 29, 2001Assignee: Alps Electric Co., Ltd.Inventors: Yutaka Naito, Yoshito Sasaki, Takashi Hatanai
-
Patent number: 6199404Abstract: A manufacturing method for a gas discharge type display panel makes it possible to manufacture an environmentally friendly substrate with high accuracy and yet at low cost. According to the manufacturing methods electrodes are formed on a back substrate by photolithography or printing, then a glass paste is printed to a height of approximately 10 &mgr;m-500 &mgr;m by printing. A barrier rib blanks are produced by rolling under pressure the glass paste by using a roller provided with grooves. The roller is heated in advance. The barrier rib blanks are sintered into the barrier ribs.Type: GrantFiled: October 21, 1997Date of Patent: March 13, 2001Assignee: Hitachi, Ltd.Inventors: Michifumi Kawai, Ryohei Satoh, Masahito Ijuin, Tomohiko Murase, Takao Terabayashi, Nobuyuki Ushifusa, Yoshihiro Kato, Shigeaki Suzuki, Seiichi Tsuchida, Yutaka Naito, Seiichi Yasumoto, Osami Kaneto
-
Patent number: 6140902Abstract: A thin magnetic element which comprises a coil pattern formed on at least one side of a substrate and a thin magnetic film formed on the coil pattern, wherein:said thin magnetic film is for++med to a thickness of 0.5 .mu.m or greater but 8 .mu.m or smaller;and at least one of the following conditions, that is, assuming that the thickness and width of a coil conductor constituting the coil pattern are t and a, respectively, an aspect ratio t/a of the coil conductor satisfies the following relationship: 0.035.ltoreq.t/a.ltoreq.0.35;and assuming that the width of the conductor constituting the coil pattern is a and the distance between the mutually adjacent coil conductors in the coil pattern is b, the following relationship: 0.2.ltoreq.a/(a+b) is satisfied.Type: GrantFiled: July 31, 1997Date of Patent: October 31, 2000Assignee: Alps Electric Co., Ltd.Inventors: Kiyohito Yamasawa, Yasuo Hayakawa, Takashi Hatanai, Akihiro Makino, Yutaka Naito, Naoya Hasegawa
-
Patent number: 6130301Abstract: A method for producing a polyolefin, which comprises polymerizing or copolymerizing at least one olefin in the presence of a catalyst system comprising (A) a solid catalyst component of a titanium catalyst component obtained by reacting at least one aluminum halide compound with a homogeneous solution containing magnesium, titanium and alkoxy groups, wherein the aluminum halide compound is added to the homogeneous solution to provide a halogen atom in a mol ratio of from 0.2 to 0.4 to one mol of the alkoxy groups contained in the homogeneous solution to precipitate particles in the former step, and the aluminum halide compound is further added to provide a halogen atom in a mol ratio of from 1 to 20 to one mol of the alkoxy groups to treat the resultant mixture containing the precipitated particles in the latter step, and (B) at least one organic aluminum compound catalyst component.Type: GrantFiled: September 4, 1997Date of Patent: October 10, 2000Assignee: Tosoh CorporationInventors: Sadaki Nishimura, Hideyuki Takitani, Yutaka Naito, Mitsuhiro Mori
-
Patent number: 5629390Abstract: A method for producing a polyolefin in the presence of a catalyst comprising a transition metal compound and an organometallic compound, wherein a catalyst system is used which comprises: (A) a solid catalyst component prepared by reacting a uniform solution containing (I) at least one member selected from the group consisting of metal magnesium and a hydroxylated organic compound, and oxygen-containing organic compounds of magnesium, (II) an electron donative compound and (III) an oxygen-containing organic compound of titanium, with (IV) at least one aluminum halide compound to obtain a solid product, adding to this solid product (V) at least one compound selected from the group consisting of oxygen-containing organic compounds of one or more transition metals of Group IVa of the Periodic Table, and then treating the mixture with (VI) an aluminum halide compound, and (B) at least one catalyst component selected from the group consisting of organoaluminum compounds.Type: GrantFiled: May 16, 1996Date of Patent: May 13, 1997Assignee: Tosoh CorporationInventors: Sadaki Nishimura, Yutaka Naito, Toshikazu Chikusa, Mitsuhiro Mori, Yozo Kondo
-
Patent number: 5481056Abstract: This invention relates to a process for the polymerization of polyolefins, in which .alpha.-olefins are polymerized in the presence of a catalyst system composed of: the solid catalyst component (A) obtained by reacting a magnesium compound with oxygen-containing organic compounds of a transition metal, aluminum and silicon, followed by further reacting with a halogenated organoaluminum compound, and the catalyst component (B) comprising of organoaluminum compound and/or organoaluminoxane compound. The catalyst system of this invention provides polymers having an excellent particle form and the molecular weight distribution being easily controlled in a wide range, in high activity, and copolymers having a narrow composition distribution range.Type: GrantFiled: July 20, 1993Date of Patent: January 2, 1996Assignee: Tosoh CorporationInventors: Fumiharu Takahashi, Yutaka Naito, Mitsuhiro Mori, Sadaki Nishimura
-
Patent number: 5412046Abstract: A polyethylene, having 1 to 60 methyl branches and 1 to 60 hexyl or higher branches per 1000 carbon atoms, a g-value of 0.5 to 0.8, and a limiting viscosity [.eta.] of 0.005 to 20.0 dl/g as measured at 140.degree. C. in o-dichlorobenzene, and a method for producing the same by polymerizing ethylene using a catalyst system comprising a coordination nickel compound of zero- or two-valent nickel and an aminobis(imino)phosphorane represented by a general formula (I): ##STR1## where R.sub.1, R.sub.2, R.sub.3 and R.sub.4 may be the same as or different from each other and are respectively n-alkyl, isoalkyl, aryl or trialkylsilyl, in the presence of .alpha.-olefin.Type: GrantFiled: March 14, 1994Date of Patent: May 2, 1995Assignee: Tosoh CorporationInventors: Akihiro Yano, Yutaka Naito, Kunitaka Yamada, Masaaki Ohtsuru
-
Patent number: 5118769Abstract: A manufacturing method of polyolefin is disclosed wherein the catalyst used for the polymerization of .alpha.Type: GrantFiled: July 5, 1988Date of Patent: June 2, 1992Assignee: Toyo Soda Manufacturing Co., Ltd.Inventors: Yozo Kondo, Mitsuhiro Mori, Yutaka Naito, Hideyuki Takitani, Toshikazu Chikusa