Patents Assigned to Dowa Holdings Co., Ltd.
  • Patent number: 11876030
    Abstract: There are provided a clad material and a method for producing the same, the clad material being capable of preventing cracks from being formed and preventing the separation of layers thereof from being caused, even if it is punched by press-working (even if a high shearing force is applied thereto by thermal shock. After each of Mo—Cu layers 10, which has a metal film 10a of a metal selected from the group consisting of Co, Ti, Pd, Pt and Ni on at least one side thereof is arranged on a corresponding one of both sides of a Cu-graphite layer 12, which is obtained by sintering a graphite powder having a Cu film on the surface thereof, so as to allow the metal film 10a to contact the Cu-graphite layer 12, the layers are heated while a pressure is applied between the Cu-graphite layer 12 and the Mo—Cu layers 10.
    Type: Grant
    Filed: December 3, 2018
    Date of Patent: January 16, 2024
    Assignees: DOWA HOLDINGS CO., LTD., THE GOODSYSTEM CORPORATION
    Inventors: Tomotsugu Aoyama, Hiroto Narieda, Ilho Kim, Meoung whan Cho
  • Patent number: 11652204
    Abstract: Provided is a metal negative electrode used for a secondary battery. The metal negative electrode includes an active material portion, a current collector, and a non-electronically conductive reaction space divider. The active material portion forms metal during charging and forms an oxidation product of the metal during discharging. The metal is used as a negative-electrode active material. The current collector is electrically connected to the active material portion. The non-electronically conductive reaction space divider is integrally formed with or connected to the current collector and/or the active material portion. The reaction space divider has a plurality of electrolyte holder portions configured to hold a liquid electrolyte.
    Type: Grant
    Filed: September 11, 2020
    Date of Patent: May 16, 2023
    Assignees: THE DOSHISHA, DOWA HOLDINGS Co., Ltd.
    Inventor: Masatsugu Morimitsu
  • Publication number: 20230040765
    Abstract: Provided is an ultraviolet light receiving device having photosensitivity effective to target wavelengths in the ultraviolet region. A Schottky junction ultraviolet light receiving device has the photosensitivity peak wavelength in an ultraviolet region of 230 nm or more and 320 nm or less, and exhibits a rejection ratio of 105 or more, the rejection ratio being the ratio of the responsivity Rp to the peak photosensitivity wavelength to the average of the responsivity Rv to a visible region of 400 nm or more and 680 nm or less (Rp/Rv).
    Type: Application
    Filed: January 15, 2021
    Publication date: February 9, 2023
    Applicants: DOWA HOLDINGS Co., Ltd., DOWA Electronics Materials Co., Ltd.
    Inventors: Ryuichi TOBA, Yasuhiro WATANABE
  • Publication number: 20220320488
    Abstract: Provided is a metal negative electrode that has an excellent repeat resistance and is excellent in charge and discharge cycle characteristics even in a high charge and discharge rate, a method for fabricating the same, and a secondary battery using the metal negative electrode. The metal negative electrode is a metal negative electrode used for a secondary battery, which includes an active material portion, a current collector, and a non-electronically conductive reaction space divider. The active material portion forms metal during charging and forms an oxidation product of the metal during discharging. The metal is used as a negative-electrode active material. The current collector is electrically connected to the active material portion. The non-electronically conductive reaction space divider is integrally formed with or connected to the current collector and/or the active material portion. The reaction space divider has a plurality of electrolyte holder portions configured to hold a liquid electrolyte.
    Type: Application
    Filed: September 11, 2020
    Publication date: October 6, 2022
    Applicants: THE DOSHISHA, DOWA HOLDINGS Co., Ltd.
    Inventor: Masatsugu MORIMITSU
  • Patent number: 11309454
    Abstract: A deep ultraviolet LED with a design wavelength ?, including a reflecting electrode layer (Au), a metal layer (Ni), a p-GaN contact layer, a p-block layer made of a p-AlGaN layer, an i-guide layer made of an AlN layer, a multi-quantum well layer, an n-AlGaN contact layer, a u-AlGaN layer, an AlN template, and a sapphire substrate that are arranged in this order from a side opposite to the sapphire substrate, in which the thickness of the p-block layer is 52 to 56 nm, a two-dimensional reflecting photonic crystal periodic structure having a plurality of voids is provided in a region from the interface between the metal layer and the p-GaN contact layer to a position not beyond the interface between the p-GaN contact layer and the p-block layer in the thickness direction of the p-GaN contact layer, the distance from an end face of each of the voids in the direction of the sapphire substrate to the interface between the multi-quantum well layer and the i-guide layer satisfies ?/2n1Deff (where ? is the design wav
    Type: Grant
    Filed: January 25, 2019
    Date of Patent: April 19, 2022
    Assignees: Marubun Corporation, Shibaura Machine Co., Ltd., RIKEN, ULVAC, Inc., Tokyo Ohka Kogyo Co., Ltd., Nippon Tungsten Co., Ltd., Dai Nippon Printing Co., Ltd., Dowa Holdings Co., Ltd.
    Inventors: Yukio Kashima, Eriko Matsuura, Mitsunori Kokubo, Takaharu Tashiro, Hideki Hirayama, Noritoshi Maeda, Masafumi Jo, Ryuichiro Kamimura, Yamato Osada, Kanji Furuta, Takeshi Iwai, Yohei Aoyama, Yasushi Iwaisako, Tsugumi Nagano, Yasuhiro Watanabe
  • Publication number: 20210175147
    Abstract: There are provided a clad material and a method for producing the same, the clad material being capable of preventing cracks from being formed and preventing the separation of layers thereof from being caused, even if it is punched by press-working (even if a high shearing force is applied thereto by thermal shock. After each of Mo—Cu layers 10, which has a metal film 10a of a metal selected from the group consisting of Co, Ti, Pd, Pt and Ni on at least one side thereof is arranged on a corresponding one of both sides of a Cu-graphite layer 12, which is obtained by sintering a graphite powder having a Cu film on the surface thereof, so as to allow the metal film 10a to contact the Cu-graphite layer 12, the layers are heated while a pressure is applied between the Cu-graphite layer 12 and the Mo—Cu layers 10.
    Type: Application
    Filed: December 3, 2018
    Publication date: June 10, 2021
    Applicants: Dowa Holdings Co., Ltd., The Goodsystem Corporation
    Inventors: Tomotsugu Aoyama, Hiroto Narieda, Ilho Kim, Meoung whan Cho
  • Patent number: 10680245
    Abstract: Provided is an active material composite powder with which resistance can be reduced, and a method for manufacturing the active material composite powder. The active material composite powder includes an active material and lithium niobate attached onto the surface of the active material, and its BET specific surface area S [m2/g] is 0.93<S<1.44, and the method for manufacturing an active material composite powder includes a spraying and drying step of spraying a solution including lithium and a peroxo complex of niobium onto the active material and at the same time drying the solution, and a heating treatment step of carrying out a heating treatment after the spraying and drying step, wherein the temperature of the heating treatment is higher than 123° C. and lower than 350° C.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: June 9, 2020
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, DOWA HOLDINGS CO., LTD.
    Inventors: Takayuki Uchiyama, Nariaki Miki, Yoshiaki Aiki, Koji Tanoue
  • Patent number: 10629911
    Abstract: Provided is an active material composite powder with which resistance can be reduced, and a method for manufacturing the active material composite powder. The active material composite powder includes an active material and lithium niobate attached onto the surface of the active material, and its BET specific surface area S [m2/g] is 0.93<S<1.44, and the method for manufacturing an active material composite powder includes a spraying and drying step of spraying a solution including lithium and a peroxo complex of niobium onto the active material and at the same time drying the solution, and a heating treatment step of carrying out a heating treatment after the spraying and drying step, wherein the temperature of the heating treatment is higher than 123° C. and lower than 350° C.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: April 21, 2020
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, DOWA HOLDINGS CO., LTD.
    Inventors: Takayuki Uchiyama, Nariaki Miki, Yoshiaki Aiki, Koji Tanoue
  • Patent number: 10578564
    Abstract: A method for producing silver nanowires, containing reduction-precipitating silver in the form of wire in an alcohol solvent having dissolved therein a silver compound, the deposition being performed in the alcohol solvent having dissolved therein a chloride, a bromide, an alkali metal hydroxide, an aluminum salt, and an organic protective agent, the molar ratio Al/OH of the total Al amount of the aluminum salt dissolved in the solvent and the total hydroxide ion amount of the alkali metal hydroxide dissolved therein being from 0.01 to 0.40, the molar ratio OH/Ag of the total hydroxide ion amount of the alkali metal hydroxide dissolved in the solvent and the total Ag amount of the silver compound dissolved therein being from 0.005 to 0.50.
    Type: Grant
    Filed: January 16, 2019
    Date of Patent: March 3, 2020
    Assignee: DOWA HOLDINGS CO., LTD.
    Inventors: Hirotoshi Saito, Daisuke Kodama, Kimitaka Sato
  • Patent number: 10581078
    Abstract: Provided is an active material composite powder with which resistance can be reduced, and a method for manufacturing the active material composite powder. The active material composite powder includes an active material and lithium niobate attached onto the surface of the active material, and its BET specific surface area S [m2/g] is 0.93<S<1.44, and the method for manufacturing an active material composite powder includes a spraying and drying step of spraying a solution including lithium and a peroxo complex of niobium onto the active material and at the same time drying the solution, and a heating treatment step of carrying out a heating treatment after the spraying and drying step, wherein the temperature of the heating treatment is higher than 123° C. and lower than 350° C.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: March 3, 2020
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, DOWA HOLDINGS CO., LTD.
    Inventors: Takayuki Uchiyama, Nariaki Miki, Yoshiaki Aiki, Koji Tanoue
  • Patent number: 10391555
    Abstract: Silver nanowires having a thin and long shape that exhibit excellent dispersibility in an aqueous solvent having an alcohol added thereto are provided by silver nanowires having an average diameter of 50 nm or less and an average length of 10 ?m or more, covered with a copolymer of a maleimide-based monomer and vinylpyrrolidone. The silver nanowires can be produced by a method for producing silver nanowires, containing reductively depositing silver in a wire form in an alcohol solvent having dissolved therein a silver compound, the deposition being performed in the solvent having dissolved therein a copolymer of a maleimide-based monomer and vinylpyrrolidone.
    Type: Grant
    Filed: January 14, 2016
    Date of Patent: August 27, 2019
    Assignees: THE UNIVERSITY OF SHIGA PREFECTURE, DOWA HOLDINGS CO., LTD.
    Inventors: Shohei Ida, Yoshitsugu Hirokawa, Jeyadevan Balachandran, Jhon Lehman Cuya Huaman, Kimitaka Sato
  • Publication number: 20190154598
    Abstract: A method for producing silver nanowires, containing reduction-precipitating silver in the form of wire in an alcohol solvent having dissolved therein a silver compound, the deposition being performed in the alcohol solvent having dissolved therein a chloride, a bromide, an alkali metal hydroxide, an aluminum salt, and an organic protective agent, the molar ratio Al/OH of the total Al amount of the aluminum salt dissolved in the solvent and the total hydroxide ion amount of the alkali metal hydroxide dissolved therein being from 0.01 to 0.40, the molar ratio OH/Ag of the total hydroxide ion amount of the alkali metal hydroxide dissolved in the solvent and the total Ag amount of the silver compound dissolved therein being from 0.005 to 0.50.
    Type: Application
    Filed: January 16, 2019
    Publication date: May 23, 2019
    Applicant: DOWA HOLDINGS CO., LTD.
    Inventors: Hirotoshi SAITO, Daisuke Kodama, Kimitaka Sato
  • Patent number: 10256464
    Abstract: A method for producing a negative electrode active material for a lithium ion secondary battery, comprising a step of charging either silicon and copper (II) oxide or silicon and copper metal in a pulverization device, pulverizing either the silicon and copper (II) oxide or silicon and copper metal, and simultaneously mixing either silicon and copper (II) oxide or silicon and copper metal thus pulverized. A negative electrode active material for a lithium ion secondary battery is produced by the method.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: April 9, 2019
    Assignees: TOHOKU UNIVERSITY, DOWA HOLDINGS CO., LTD.
    Inventors: Norihiro Shimoi, Kazuyuki Tohji, Yasumitsu Tanaka, Qiwu Zhang, Hiroyuki Kai
  • Patent number: 10233099
    Abstract: Disclosed herein is a radioactive cesium decontaminator, a method of producing a radioactive cesium decontaminator, and a method of removing radioactive cesium using the decontaminator. The radioactive cesium decontaminator is formed by agglomeration of primary particles. The primary particles have a magnetic particle as a core portion, a coating layer made of an organic material coating the magnetic particle, and a capturing compound made of ferrocyanide material formed on the coating layer. A cumulative diameter D50 of the decontaminator is in a range of from 2.0 ?m to 50 ?m, and a value of a cumulative diameter distribution (D90?D10)/D50 is less than 6. The decontaminator is made by adding a ferrocyanide aqueous solution and an aqueous solution containing at least one transition metal into a suspension liquid containing a precursor formed by magnetic particles coated with organic monomer or polymer while applying a strong shear force.
    Type: Grant
    Filed: September 10, 2013
    Date of Patent: March 19, 2019
    Assignees: THE JIKEI UNIVERSITY, DOWA HOLDINGS CO., LTD.
    Inventors: Yoshihisa Namiki, Toshihiko Ueyama, Takayuki Yoshida, Ryoei Watanabe
  • Patent number: 10220441
    Abstract: A method for producing silver nanowires, containing reduction-precipitating silver in the form of wire in an alcohol solvent having dissolved therein a silver compound, the deposition being performed in the alcohol solvent having dissolved therein a chloride, a bromide, an alkali metal hydroxide, an aluminum salt, and an organic protective agent, the molar ratio Al/OH of the total Al amount of the aluminum salt dissolved in the solvent and the total hydroxide ion amount of the alkali metal hydroxide dissolved therein being from 0.01 to 0.40, the molar ratio OH/Ag of the total hydroxide ion amount of the alkali metal hydroxide dissolved in the solvent and the total Ag amount of the silver compound dissolved therein being from 0.005 to 0.50.
    Type: Grant
    Filed: March 3, 2015
    Date of Patent: March 5, 2019
    Assignee: DOWA HOLDINGS CO., LTD.
    Inventors: Hirotoshi Saito, Daisuke Kodama, Kimitaka Sato
  • Patent number: 10213838
    Abstract: A production method of silver nanowires exhibits a yield enhancement effect for a protective agent other than PVP. The method for producing silver nanowires includes depositing a silver linear structure, which is referred to as silver nanowires, in an alcohol solvent having a silver compound, a halogen compound, and an organic protective agent dissolved therein. A deposition reaction of silver is performed in a state where aluminum nitrate is further dissolved in the solvent, the total amount of aluminum nitrate dissolved in the solvent being from 0.01 to 0.50 in terms of Al/Ag molar ratio with respect to the total amount of the silver compound. The organic protective agent is, for example, one containing one or more kinds of alkylated PVP and a PVP-PVA graft copolymer.
    Type: Grant
    Filed: January 19, 2015
    Date of Patent: February 26, 2019
    Assignees: THE UNIVERSITY OF SHIGA PREFECTURE, DOWA HOLDINGS CO., LTD.
    Inventors: Jeyadevan Balachandran, Jhon Lehman Cuya Huaman, Daisuke Kodama
  • Patent number: 10044033
    Abstract: A negative electrode active material for a lithium ion secondary battery, comprising silicon, copper and oxygen as major constitutional elements, the negative electrode active material for a lithium ion secondary battery, containing fine particles of silicon having an average crystallite diameter (Dx) measured by an X-ray diffractometry of 50 nm or less, and having elemental ratios, expressed by molar ratios, Cu/(Si+Cu+O) and O/(Si+Cu+O) of from 0.02 to 0.30, wherein the negative electrode active material contains an intermetallic compound of silicon and copper.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: August 7, 2018
    Assignees: TOHOKU UNIVERSITY, DOWA HOLDINGS CO., LTD.
    Inventors: Norihiro Shimoi, Kazuyuki Tohji, Yasumitsu Tanaka, Qiwu Zhang, Hiroyuki Kai
  • Patent number: 9761868
    Abstract: There is provided a lithium-transition metal oxide powder with a coating layer containing lithium niobate formed on a part or the whole part of a surface of a lithium-transition metal oxide particle and having a low powder compact resistance, and a positive electrode active material for a lithium ion battery containing the lithium-transition metal oxide powder. Specifically, there is provided the lithium-transition metal oxide powder composed of a lithium-transition metal oxide particle with a part or the whole part of a surface coated with a coating layer containing lithium niobate, wherein a carbon-content is 0.03 mass % or less.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: September 12, 2017
    Assignee: DOWA HOLDINGS CO., LTD.
    Inventor: Akira Nagatomi
  • Patent number: 9761907
    Abstract: A positive electrode active material for a lithium ion secondary cell, in which the amount of a transition metal present in the vicinity of the outermost surface thereof is significantly decreased is provided. A solid electrolyte-coated positive electrode active material powder contains particles of a positive electrode active material for lithium ion secondary cell, containing a composite oxide of Li and a transition metal M, having on a surface thereof a coating layer of a solid electrolyte represented by Li1+XAlXTi2?X(PO4)3, wherein 0 £ X £ 0.5. An average proportion of a total atom number of Al, Ti and P in a total atom number of Al, Ti, M and P within an etching depth of 1 nm from the outermost surface determined by analysis in a depth direction with XPS is 50% or more. The transition metal M is, for example, at least one kind of Co, Ni and Mn.
    Type: Grant
    Filed: May 6, 2014
    Date of Patent: September 12, 2017
    Assignee: DOWA HOLDINGS CO., LTD.
    Inventors: Koji Tanoue, Yoshiaki Aiki
  • Patent number: 9679670
    Abstract: There is provided an aggregate of radioactive material removing particles in which two or more radioactive material removing particles having magnetic particles and a radioactive material adsorption component are assembled, wherein a pore volume in the aggregate is 0.5 mL/g or more and 5.0 mL/g or less, and the pore volume means a cumulative value obtained by a mercury press-in method.
    Type: Grant
    Filed: May 19, 2014
    Date of Patent: June 13, 2017
    Assignees: THE JIKEI UNIVERSITY, DOWA HOLDINGS CO., LTD.
    Inventors: Yoshihisa Namiki, Toshihiko Ueyama, Takayuki Yoshida