Patents by Inventor Katsutoshi Tanaka

Katsutoshi Tanaka 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).

  • Patent number: 10347724
    Abstract: A gate insulating film covers a trench penetrating through a source region and a body region and reaching a drift layer in each of a first cell region and a second cell region. The gate electrode is provided in the trench. A high-concentration layer of the first conductivity type is provided between the drift layer and the body region in the first cell region and has a second impurity concentration higher than the first impurity concentration. A current restriction layer is provided between the drift layer and the body region in the second cell region and has the first conductivity type and a third impurity concentration higher than the first impurity concentration and lower than the second impurity concentration.
    Type: Grant
    Filed: December 7, 2015
    Date of Patent: July 9, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Rina Tanaka, Katsutoshi Sugawara, Yasuhiro Kagawa, Naruhisa Miura
  • Publication number: 20190206987
    Abstract: A semiconductor device including: a trench gate; a trench-bottom protecting layer of a second conductivity type provided in a semiconductor layer of a first conductivity type while contacting a bottom of trenches; and a depletion suppressing layer of the first conductivity type provided between adjacent trench-bottom protecting layers, wherein the depletion suppressing layer includes an intermediate point that is horizontally equidistant to the adjacent trench-bottom protecting layers and is formed of a size to contact neither the trenches nor the trench-bottom protecting layers, and an impurity concentration of the depletion suppressing layer is set higher than an impurity concentration of the semiconductor layer.
    Type: Application
    Filed: January 18, 2017
    Publication date: July 4, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kohei ADACHI, Katsutoshi SUGAWARA, Yutaka FUKUI, Rina TANAKA, Kazuya KONISHI
  • Patent number: 10312233
    Abstract: A semiconductor device includes a base region of second conductivity type formed on a drift layer of first conductivity type, a source region of first conductivity type located in the base region, a trench passing through the base region and the source region and dividing cell regions in plan view, a protective diffusion layer of second conductivity type disposed on a bottom of the trench, a gate electrode embedded in the trench with a gate insulating film therebetween, a source electrode electrically connected to the source region, and a protective contact region disposed at each of positions of three or more cell regions and connecting the protective diffusion layer and the source electrode to each other. The protective contact regions are disposed such that a triangle whose vertices are centers of three protective contact regions located closest to one another is an acute triangle.
    Type: Grant
    Filed: September 16, 2015
    Date of Patent: June 4, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Katsutoshi Sugawara, Yasuhiro Kagawa, Rina Tanaka, Yutaka Fukui
  • Patent number: 9771313
    Abstract: A purified cyclohexanol of the present invention has a methylcyclopentanol concentration of 10 to 1000 ppm by weight and a cyclohexylcyclohexene isomer concentration of 15 to 500 ppm by weight. A method for producing cyclohexanol of the present invention comprises: Step 1 of producing a solution (I) containing cyclohexanol, methylcyclopentanol, and water by a hydration reaction of cyclohexene; Step 2 of separating the solution (I) into a water phase and an oil phase; Step 3 of obtaining a partially purified cyclohexanol containing methylcyclopentanol from the oil phase; and Step 4 of separating and removing methylcyclopentanol in the partially purified cyclohexanol so as to obtain a purified cyclohexanol having a methylcyclopentanol concentration of 10 to 1000 ppm by weight and a cyclohexylcyclohexene isomer concentration of 15 to 500 ppm by weight.
    Type: Grant
    Filed: June 28, 2012
    Date of Patent: September 26, 2017
    Assignee: ASAHI KASEI CHEMICALS CORPORATION
    Inventors: Naoki Narisawa, Katsutoshi Tanaka
  • Publication number: 20140256981
    Abstract: A purified cyclohexanol of the present invention has a methylcyclopentanol concentration of 10 to 1000 ppm by weight and a cyclohexylcyclohexene isomer concentration of 15 to 500 ppm by weight. A method for producing cyclohexanol of the present invention comprises: Step 1 of producing a solution (I) containing cyclohexanol, methylcyclopentanol, and water by a hydration reaction of cyclohexene; Step 2 of separating the solution (I) into a water phase and an oil phase; Step 3 of obtaining a partially purified cyclohexanol containing methylcyclopentanol from the oil phase; and Step 4 of separating and removing methylcyclopentanol in the partially purified cyclohexanol so as to obtain a purified cyclohexanol having a methylcyclopentanol concentration of 10 to 1000 ppm by weight and a cyclohexylcyclohexene isomer concentration of 15 to 500 ppm by weight.
    Type: Application
    Filed: June 28, 2012
    Publication date: September 11, 2014
    Applicant: ASAHI KASEI CHEMICALS CORPORATION
    Inventors: Naoki Narisawa, Katsutoshi Tanaka
  • Publication number: 20090322123
    Abstract: A single wire is provided between a pair of front side frames and a power plant, respective front ends of which are coupled to front end portions of the pair of front side frames. Accordingly, the impact load can be dispersed to the both-side front side frames in case the central portion of the vehicle front collides with the pole-shaped obstacle and the power plant can be suppressed from moving rearward.
    Type: Application
    Filed: June 24, 2009
    Publication date: December 31, 2009
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Katsutoshi Tanaka, Yasuyuki Andou, Kouichi Nakano, Shiro Nakatani, Yukio Nakamura, Takao Maruko
  • Patent number: 7444963
    Abstract: It is an object of the invention to provide a reliable ignition by a spark plug in a combustion power tool. Representative combustion power tool may comprise a combustion chamber, a gas supply section, a single spark plug, an ignition control device, a cylinder connected to the combustion chamber, a piston member and a tool member. The ignition control device includes a plurality of ignition circuits connected to the single spark plug to independently input power to the spark plug, and a control section that controls the manner of power input in each of the ignition circuits. According to such construction, power input in each of the ignition circuits can be controlled and therefore, a desired power output at the single spark plug can be realized.
    Type: Grant
    Filed: July 13, 2007
    Date of Patent: November 4, 2008
    Assignee: Makita Corporation
    Inventor: Katsutoshi Tanaka
  • Publication number: 20080011251
    Abstract: It is an object of the invention to provide a reliable ignition by a spark plug in a combustion power tool. Representative combustion power tool may comprise a combustion chamber, a gas supply section, a single spark plug, an ignition control device, a cylinder connected to the combustion chamber, a piston member and a tool member. The ignition control device includes a plurality of ignition circuits connected to the single spark plug to independently input power to the spark plug, and a control section that controls the manner of power input in each of the ignition circuits. According to such construction, power input in each of the ignition circuits can be controlled and therefore, a desired power output at the single spark plug can be realized.
    Type: Application
    Filed: July 13, 2007
    Publication date: January 17, 2008
    Inventor: Katsutoshi Tanaka
  • Patent number: 7045989
    Abstract: A plurality of charging devices 30 may be connected to a computer 10, 110 via a network 60. When computer 10 receives chewing information from a charging device 30 before performing a charging operation, computer 10 may compute the optimal charging period based upon the charging information. Parameters defining the optimal charging period may be transmitted to the respective charging devices 30. Each charging device 30 may perform the battery charging operation based upon the transmitted parameters. Thus, a network system can manage and control the charging operations for the plurality of charging devices in order to optimize charging period, optimize the number of charging devices 30 and battery packs 50 in use and maximize battery life.
    Type: Grant
    Filed: April 17, 2002
    Date of Patent: May 16, 2006
    Assignee: Makita Corporation
    Inventors: Kazuyuki Sakakibara, Katsutoshi Tanaka
  • Patent number: 6500398
    Abstract: A low-cost and practically useful method for preventing global warming by decomposing N2O wherein N2O contained in an N2O-containing gas to be treated can be decomposed at a relatively low temperature; and an apparatus therefor. That is, a method for preventing global warming comprising, in a process of thermally or catalytically decomposing N2O in an N2O-containing gas to be treated, dividing the N2O-containing gas stream to be treated in portions, preheating a portion thereof so as to exothermally decompose N2O in said gas stream to form a hot gas stream, and supplying the remainder of the divided gas stream to be treated into said hot gas stream to thereby continuously decompose N2O, so that global warming is prevented; and an apparatus therefor.
    Type: Grant
    Filed: May 18, 2000
    Date of Patent: December 31, 2002
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Katsushi Tagawa, Koji Miura, Souhei Kodama, Atsushi Shimizu, Katsutoshi Tanaka
  • Publication number: 20020156537
    Abstract: A plurality of charging devices 30 may be connected to a computer 10, 110 via a network 60. When computer 10 receives chewing information from a charging device 30 before performing a charging operation, computer 10 may compute the optimal charging period based upon the charging information. Parameters defining the optimal charging period may be transmitted to the respective charging devices 30. Each charging device 30 may perform the battery charging operation based upon the transmitted parameters. Thus, a network system can manage and control the charging operations for the plurality of charging devices in order to optimize charging period, optimize the number of charging devices 30 and battery packs 50 in use and maximize battery life.
    Type: Application
    Filed: April 17, 2002
    Publication date: October 24, 2002
    Inventors: Kazuyuki Sakakibara, Katsutoshi Tanaka
  • Patent number: 6071997
    Abstract: A three-dimensional composite of silica spheres interconnected by resin is provided having a three-dimensional network structure including silica particles having the following structural and dynamic characteristics and a resin present in the internal pores of said network:(a) three-dimensionally interconnected spherical silica particles having a diameter of 6 to 30 .mu.m;(b) on the surface of said spherical silica particles, a specific surface area of 300 to 400 m.sup.
    Type: Grant
    Filed: May 14, 1997
    Date of Patent: June 6, 2000
    Assignee: Agency of Industrial Science and Technology
    Inventors: Yuko Tanaka, Muneaki Yamaguchi, Hiromasa Ogawa, Katsutoshi Tanaka
  • Patent number: 5900450
    Abstract: A method for preparing a three dimensionally connected silica spheres-resin composite, which comprises hydrolyzing and polymerizing a low molecular weight polyalkoxysilane in the presence of an acid catalyst in a mixed solution of the low molecular weight polyalkoxysilane and a water-soluble polymer in a solvent mixture of water and alcohol to obtain a three dimensional connected silica spheres, impregnating the three dimensional connected silica spheres with at least one material selected from resin-forming monomers and resin-forming prepolymers, and curing the material. The composite obtained by the above method retains its strength even at high temperatures where the organic matter undergoes pyrolysis or burnout.
    Type: Grant
    Filed: May 22, 1997
    Date of Patent: May 4, 1999
    Assignee: Agency of Industrial Science & Technology
    Inventors: Yuko Tanaka, Muneaki Yamaguchi, Hiromasa Ogawa, Katsutoshi Tanaka
  • Patent number: 5656250
    Abstract: A three-dimensional network structure comprising three-dimensionally interconnected spherical silica particles, having specific physical characteristics including diameter, pores on the surfaces of the particles, cross-sectional areas of the bonds interconnecting the spherical silica particles, elasticity modulus, voids content, and silica content, the surfaces of the spherical silica particles being wholly or partly covered with a water-soluble polymer, the network structure being able to remain substantially intact when heat-treated and being able to undergo machining. There is also provided a method of making a three-dimensional network structure comprising spherical silica particles, comprising hydrolyzing and polymerizing a low polymer of an alkoxysilane in a mixed solution containing the alkoxysilane low polymer and a water-soluble polymer in a mixed solvent composed of water and an alcohol in the presence of an acid catalyst.
    Type: Grant
    Filed: June 27, 1995
    Date of Patent: August 12, 1997
    Assignee: Jiro Hiraishi, Director-General, Agency of Industrial Science and Technology
    Inventors: Yuko Tanaka, Muneaki Yamaguchi, Hiromasa Ogawa, Katsutoshi Tanaka
  • Patent number: 5045587
    Abstract: The present invention relates to a method of maintaining the flowability of a dispersion of fine particles of a water-soluble polymer mainly comprising acrylic acid and/or acrylamide in an aqueous salt solution for a long period of time.In order to attain the above-described object, the present invention is characterized by adding to a polymer dispersion 0.05 to 1% by weight, based on the dispersion, of a nonionic surfactant and 2 to 10% by weight, based on the dispersion, of an oleaginous liquid. The aqueous salt solution for dispersing the polymer particles is most preferably an aqueous solution of a salt wherein the counter ion is a monovalent cation, and the salt concentration of the aqueous solution is preferably at least 15% by weight.The acrylic water-soluble polymer dispersion is used for applications such as high-molecular flocculants, sizing agents, or paper-strength agents.
    Type: Grant
    Filed: December 12, 1989
    Date of Patent: September 3, 1991
    Assignee: Kyoritsu Yuki Co., Ltd.
    Inventor: Katsutoshi Tanaka
  • Patent number: 4370464
    Abstract: Novel cationic polymer flocculants are prepared by polycondensation of an epihalohydrin and mixed Mannich reaction products of a monohydric phenol and bisphenol with formaldehyde and dialkylamine. The flocculants are stable in aqueous solutions and show an excellent effect in purification of industrial effluents.
    Type: Grant
    Filed: October 28, 1981
    Date of Patent: January 25, 1983
    Assignees: Kyoritsu Yuki Co., Ltd., Mitsubishi Chemical Industries, Ltd.
    Inventors: Katsutoshi Tanaka, Hisao Takeda, Mutsumi Kawano, Isao Miyahara
  • Patent number: 4155847
    Abstract: New cationic flocculants are prepared by polycondensation of an epihalohydrin and Mannich reaction products of phenol, formaldehyde, and dialkylamine. The flocculants are useful for flocculation of various kinds of suspension such as various industrial waste waters, pulp slurry in paper making and the like.
    Type: Grant
    Filed: August 10, 1978
    Date of Patent: May 22, 1979
    Assignees: Mitsubishi Chemical Industries, Ltd., Kyoritsu Yuki Co., Ltd.
    Inventors: Katsutoshi Tanaka, Hisao Takeda, Mutsumi Kawano, Isao Miyahara
  • Patent number: 4154910
    Abstract: Concentrated aqueous solution of acrylamide or mixture of acrylamide and other vinyl monomer is polymerized in the presence of catalyst, and the polymerization solution is to be boiled by heat of polymerization in the course of polymerization.Obtained hydrous gels of acrylamide polymers are porous, water soluble and are easily dehydrated by conventional dehydration techniques.
    Type: Grant
    Filed: May 10, 1977
    Date of Patent: May 15, 1979
    Assignees: Kyoritsu Yuki Co., Ltd., Mitsubishi Chemical Industries, Ltd.
    Inventors: Katsutoshi Tanaka, Kazuo Ikeda
  • Patent number: 4009278
    Abstract: Novel N-(3,5-dihalophenyl)imide compounds, which exhibit a strong antimicrobial activity against microorganisms including phytopathogenic fungi, parasites of industrial products and pathogenic microorganisms, represented by the formula, ##STR1## wherein X and X' each represent halogens and A represents a substituted ethylene such as chloroethylene, C.sub.1 - C.sub.4 alkylthioethylene, C.sub.1 - C.sub.2 alkyl-ethylene or 1,2-di-C.sub.1 - C.sub.2 -alkyl-ethylene, a cyclopropylene such as 1,3-dimethylcyclopropylene, trimethylene, a cyclohexylene-1,2-, cyclohexenylene-1,2-, cyclohexadienylene-1,2- or o-phenylene.The N-(3,5-dihalophenyl)imide compounds can be obtained by any of methods which produce imide compounds or reaction of an N-(3,5-dihalophenyl)maleimide compound with a mercaptan, a hydrogen halide, phosphorus chloride or thionylchloride.
    Type: Grant
    Filed: April 24, 1975
    Date of Patent: February 22, 1977
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Akira Fujinami, Toshiaki Ozaki, Shigehiro Ooba, Sigeo Yamamoto, Katsuji Nodera, Katsutoshi Tanaka, Keiichiro Akiba, Tadashi Ooishi, Nobuyuki Kameda
  • Patent number: 3993771
    Abstract: The present invention relates to novel .alpha.-benzylidene-.gamma.-butyrolactone derivatives and processes for the manufacture of them. Further, the present invention pertains to the fungicidal composition containing the same and use thereof.
    Type: Grant
    Filed: April 22, 1975
    Date of Patent: November 23, 1976
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Tamon Uematsu, Katsutoshi Tanaka, Yuzuru Sanemitsu