Patents by Inventor Mitsuyoshi Nagano
Mitsuyoshi Nagano 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: 10782824Abstract: A main control board is disposed in an accommodation space, is connected to an interactive display portion, and controls at least the interactive display portion. A power supply board is disposed in an accommodation space, is connected to the interactive display portion and the main control board, and supplies power to the interactive display portion and the main control board. A plug receiving portion is provided on a left plate which is one of a plurality of side plates, is connected to the power supply board, and has connected thereto by the attraction force of a magnet, a magnet-type plug of a magnetic cord that can be connected to an external power supply.Type: GrantFiled: August 13, 2019Date of Patent: September 22, 2020Assignee: TOYOMARU SANGYO KABUSHIKI KAISHAInventors: Mitsuyoshi Nagano, Shoji Hirata, Satoru Minoshima
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Publication number: 20190361566Abstract: A main control board is disposed in an accommodation space, is connected to an interactive display portion, and controls at least the interactive display portion. A power supply board is disposed in an accommodation space, is connected to the interactive display portion and the main control board, and supplies power to the interactive display portion and the main control board. A plug receiving portion is provided on a left plate which is one of a plurality of side plates, is connected to the power supply board, and has connected thereto by the attraction force of a magnet, a magnet-type plug of a magnetic cord that can be connected to an external power supply.Type: ApplicationFiled: August 13, 2019Publication date: November 28, 2019Applicant: TOYOMARU SANGYO KABUSHIKI KAISHAInventors: Mitsuyoshi NAGANO, Shoji HIRATA, Satoru MINOSHIMA
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Patent number: 9120704Abstract: A dielectric layer for an electrostatic chuck is formed of a ceramic material having a first phase including aluminum oxide and a second phase including composite carbonitride (Ti, Me)(C, N) that contains titanium as fine grains. The Me represents a transition element and metals of Group 4 to Group 6 such as Mo and W. The ceramic material that includes the second phase by 0.05 vol % to 2.5 vol % has a volume resistivity value of about 108 to 1013 (?·cm) necessary for a Johnsen-Rahbek type electrostatic chuck.Type: GrantFiled: October 15, 2013Date of Patent: September 1, 2015Assignees: Nippon Tungsten Co., Ltd., Shinko Electric Industries Co., Ltd., Trek Holding Co., Ltd., Japan Fine Ceramics CenterInventors: Kouta Tsutsumi, Mitsuyoshi Nagano, Koki Tamagawa, Norio Shiraiwa, Tadayoshi Yoshikawa, Miki Saito, Toshio Uehara, Hideaki Matsubara, Tetsushi Matsuda
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Patent number: 9079800Abstract: A composite ceramic body which includes three phases consisting of a MgO phase, a YAP (YAlO3) phase and a spinel (MgAl2O4) phase. This composite ceramic body has a plasma resistance greater than that of alumina and approximately equal to that of MgO. Mechanical properties, such as hardness and bending strength, of the composite ceramic body, are approximately equal or superior to those of Al2O3. A raw material cost and a manufacturing cost thereof are lower than those of a rare-earth oxide. Further, electric conductive particles may be added thereto to lower an electrical resistivity. The composite ceramic body is suitably usable as component parts for a semiconductor manufacturing equipment.Type: GrantFiled: April 17, 2013Date of Patent: July 14, 2015Assignee: NIPPON TUNGSTEN CO., LTDInventors: Kouta Tsutsumi, Ryou Matsuo, Mitsuyoshi Nagano
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Publication number: 20140103612Abstract: A dielectric layer for an electrostatic chuck is formed of a ceramic material having a first phase including aluminum oxide and a second phase including composite carbonitride (Ti, Me)(C, N) that contains titanium as fine grains. The Me represents a transition element and metals of Group 4 to Group 6 such as Mo and W. The ceramic material that includes the second phase by 0.05 vol % to 2.5 vol % has a volume resistivity value of about 108 to 1013 (?·cm) necessary for a Johnsen-Rahbek type electrostatic chuck.Type: ApplicationFiled: October 15, 2013Publication date: April 17, 2014Applicants: NIPPON TUNGSTEN CO., LTD., JAPAN FINE CERAMICS CENTER, TREK HOLDING CO., LTD., SHINKO ELECTRIC INDUSTRIES CO., LTD.Inventors: Kouta Tsutsumi, Mitsuyoshi Nagano, Koki Tamagawa, Norio Shiraiwa, Tadayoshi Yoshikawa, Miki Saito, Toshio Uehara, Hideaki Matsubara, Tetsushi Matsuda
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Patent number: 8454933Abstract: The invention provides a polycrystal magnesium oxide (MgO) sintered body which is capable of having a sintered density close to a theoretical density thereof. The MgO sintered body exhibits excellent mechanical properties and heat conductivity, while reducing contamination of an atmosphere due to gas generation. The invention also provides a production method for the sintered body. The polycrystal MgO sintered body has a unique crystalline anisotropy in which (111) faces are oriented along a surface applied with a uniaxial pressure at a high rate. The polycrystalline MgO sintered body is obtained by a method which includes the steps of: sintering an MgO raw material powder, having a particle size of 1 ?m or less, under a uniaxial pressure and then subjecting the sintered powder to a heat treatment under an atmosphere containing 0.05 volume % or more of oxygen, at a temperature of 1273 K or more for 1 minute or more.Type: GrantFiled: January 27, 2009Date of Patent: June 4, 2013Assignees: Nippon Tungsten Co., Ltd., Ube Material Industries, Ltd.Inventors: Mitsuyoshi Nagano, Masanobu Takasu, Yo Arita, Satoru Sano
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Publication number: 20100294657Abstract: Provided is a polycrystal MgO sintered body which is capable of having a sintered density close to a theoretical density thereof, and exhibiting excellent mechanical properties and heat conductivity, while reducing contamination of an atmosphere due to gas generation, and a production method for the sintered body. The polycrystal MgO sintered body has a unique crystalline anisotropy in which (111) faces are oriented along a surface applied with a uniaxial pressure at a high rate. The polycrystalline MgO sintered body is obtained by a method which comprises the steps of: sintering an MgO raw material powder having a particle size of 1 ?m or less, under a uniaxial pressure; and then subjecting the sintered powder to a heat treatment under an atmosphere containing 0.05 volume % or more of oxygen, at a temperature of 1273 K or more for 1 minute or more.Type: ApplicationFiled: January 27, 2009Publication date: November 25, 2010Applicants: NIPPON TUNGSTEN CO., LTD., UBE MATERIAL INDUSTRIES, LTD.Inventors: Mitsuyoshi Nagano, Masanobu Takasu, Yo Arita, Satoru Sano
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Patent number: 6551954Abstract: A WC-based composite ceramics sintered body consisting of 40 volume % to 90 volume % of WC including solid-solved oxygen represented by a chemical formula of WCxOy (where 0.005<y/x+y<0.05), with the remainder being partially stabilized ZrO2 and inevitable impurities, wherein partially stabilized ZrO2 includes one or more of stabilizers selected from the group consisting of Y2O3, CeO2 and MgO. A prepared powder of raw material is held in an atmosphere containing oxygen in a temperature range of 200° C. to 600° C. for 0.1 hour to 3 hours to provide WC grains including solid-solved oxygen represented by a chemical formula of WCxOy (where 0.005<y/x+y<0.05). Partially stabilized Zro2 including one or more of stabilizers selected from the group consisting of Y2O3, CeO2 and MgO is used as a phase for filling up the grain boundary of the WC grains.Type: GrantFiled: July 18, 2001Date of Patent: April 22, 2003Assignee: Nippon Tungsten Co., Ltd.Inventors: Mitsuyoshi Nagano, Shigeya Sakaguchi, Norimitsu Mukae, Kouki Minamoto, Toyoshige Sasaki
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Patent number: 6133182Abstract: This invention provides an alumina base ceramic sintered body excellent in wear resistance with high hardness, also with high strength and high toughness, and particularly suitable for a cutting tool or wear resistant member. This sintered body contains 5-70 % by volume of WC and 5-70% by volume of Ti (C,N) solid solution having a C/N mole ratio ranging from 1:9 to 9:1, the WC and Ti (C,N) having particle sizes of 5 .mu.m or less, respectively.Type: GrantFiled: September 9, 1999Date of Patent: October 17, 2000Assignee: Nippon Tungsten Co., Ltd.Inventors: Toyoshige Sasaki, Mitsuyoshi Nagano, Eiji Okuma, Shinzou Mitomi, Tetsuo Uchiyama, Shigeo Inoue, Haruka Tamura
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Patent number: 5093290Abstract: The deterioration of strength at high temperature of Si.sub.3 N.sub.4 --Y.sub.2 O.sub.3 --AlN series silicon nitride-type sintered bodies is reduced by employing Y.sub.2 O.sub.3 --MgO--AlN series as a sintering aid wherein the stoichiometrical ratio of Y, Mg and Al in the sintered body is controlled to a specific range, thereby decreasing the glass phase to decrease deterioration of strength at high temperatures. Assuming Y as A.sub.1 mol, Mg as B.sub.1 mol and A.sub.1 as C.sub.1 mol based on one mol of Si.sub.3 N.sub.4 in the sintered body, the specific range, wherein each of A.sub.1, B.sub.1 and C.sub.1 is not less than 0, satisifies the conditions: ##EQU1## and the crystal phase of Si.sub.3 N.sub.4 consisting of an .alpha.-Si.sub.3 N.sub.4 phase in which a part of Si.sub.3 N.sub.4 is replaced by Y, Mg, O and Al, and a .beta.-Si.sub.3 N.sub.4 phase in which a part of Si.sub.3 N.sub.Type: GrantFiled: March 2, 1990Date of Patent: March 3, 1992Assignee: Nippon Tungsten Co., Ltd.Inventors: Mitsuhiko Furukawa, Masaharu Shiroyama, Mitsuyoshi Nagano, Yasumi Takano
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Patent number: 4902651Abstract: A material for thin film magnetic head slider particularly suited for high recording, which is obtained by sintering a mixture consisting essentially of:5 to 45% by weight of titanium carbide component;0.2 to 10% by weight of zirconium oxide;0.05 to 2% by weight of oxide of yttrium;0.2 to 25% by weight of aluminum nitride; and the balance of Al.sub.2 O.sub.3 component substituted with 0.5 to 8% by weight being at least one machinability agent selected from the group consisting of oxides of Mg, Ca, B, Ni and Cr and complex oxides thereof.Type: GrantFiled: March 3, 1987Date of Patent: February 20, 1990Assignees: Sumitomo Special Metals, Co., Nippon Tungsten Co., Ltd.Inventors: Toshiaki Wada, Mitsuhiko Furukawa, Masaharu Shiroyama, Mitsuyoshi Nagano, Michito Miyahara, Takashi Kitahira, Shigeki Mohri
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Patent number: 4814915Abstract: A magnetic head slider and a material for it which comprises a sintered body obtained by sintering a raw material powder composed of 65 to 90% by weight of ZrO.sub.2 component containing therein a stabilizer and the balance of Al.sub.2 O.sub.3 component, 2% by weight or below of which has been substituted with a binder. The stabilizer is Y.sub.2 O.sub.3, MgO or CeO and the binder is Y.sub.2 O.sub.3 or MgO.Type: GrantFiled: May 26, 1987Date of Patent: March 21, 1989Assignees: Sumitomo Special Metals Co., Ltd., Nippon Tungsten Co., Ltd.Inventors: Toshiaki Wada, Mitsuhiko Furukawa, Masaharu Shiroyama, Michito Miyahara, Shigeki Mohri, Mitsuyoshi Nagano
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Patent number: 4796127Abstract: A recording head slider comprises a slider body having a fluid bearing surface on a primary surface thereof and at least one transducer on at least one side of the slider body, the slider body being made of a sintered body produced by sintering a base composition consisting essentially of 10-40 percent by volume of silicon carbide and the balance being alumina. The base composition may comprise 0.2-10 percent by weight of sintering aids MgO, Y.sub.2 O.sub.3, ZrO.sub.2, CaO, Er.sub.2 O.sub.3 and Cr.sub.2 O.sub.3. This slider has high precision machinability and compatibility with recording media.Type: GrantFiled: January 11, 1988Date of Patent: January 3, 1989Assignees: Sumitomo Special Metals Co., Ltd., Nippon Tungsten Co., Ltd.Inventors: Toshiaki Wada, Mitsuhiko Furukawa, Masaharu Shiroyama, Michito Miyahara, Mitsuyoshi Nagano, Shigeki Mohri
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Patent number: 4598052Abstract: An alumina base substrate material for recording heads, which comprises a densely sintered body consisting essentially of:per 100 parts by weight of a base component of 30 to 40% by weight of a titanium compound having TiO.sub.2 to (TiC+TiO.sub.2) percentage of 5 to 15% by weight and the balance being Al.sub.2 O.sub.3,components A, B and C, provided that the A to B ratio is within a hatched KLMN area in FIG. 1, in the following given parts by weight, andoxidic impurities in amounts of no higher than 0.2% by weight based on the total composition,said sintered body having an average crystal grain size of no higher than 1.3 microns, a porosity per area of no higher than 0.5%, a bending strength of at least 70 kg/cm.sup.2 and a hardness H.sub.R A of at least 93.0: whereincomponent A is at least one of spinels expressed by RO-Al.sub.2 O.sub.3, where R is at least one of Mg, Mn, Ni and Co, in an amount of 2.0 to 17.5 parts by weight,component B is 0.2 to 2.0 parts by weight of ZrO.sub.2, andComponent C is 0.Type: GrantFiled: April 29, 1985Date of Patent: July 1, 1986Assignees: Sumitomo Special Metals Co., Ltd., Nippon Tungsten Co., Ltd.Inventors: Toshiaki Wada, Mitsuhiko Furukawa, Mitsuyoshi Nagano, Michito Miyahara, Shigeki Mori