Patents by Inventor Akihiko Shirakawa
Akihiko Shirakawa 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: 20240091342Abstract: Provided is an orally administrable vaccine against a coronavirus infectious disease. A transformed Bifidobacterium designed to display a part or a whole of a constituent protein of a coronavirus on a surface of the Bifidobacterium enables the provision of the orally administrable vaccine against a coronavirus infectious disease. The transformed Bifidobacterium designed to display a part or a whole of a constituent protein of a coronavirus on a surface of the Bifidobacterium can induce humoral immunity and cellular immunity through oral administration to suppress an increase in severity of pneumonia or the like even after viral infection.Type: ApplicationFiled: January 25, 2022Publication date: March 21, 2024Applicants: NATIONAL UNIVERSITY CORPORATION KOBE UNIVERSITY, Kyoto UniversityInventors: Toshiro SHIRAKAWA, Shunpei UENO, Koichi KITAGAWA, Akihiko KONDO, Masanori KAMEOKA, Takane KATAYAMA
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Patent number: 10232539Abstract: A weather strip including a bottom wall, a first lateral wall and a second lateral wall and in which an angle between the bottom wall and the first lateral wall is constant and an angle between the bottom wall and the second lateral wall is partially varied in a longitudinal direction is manufactured. The method includes: a first step of pre-forming the angle of the first lateral wall and the angle of the second lateral wall to be constant and equal to or larger than final maximum angles; a second step of regulating a boundary between the bottom wall and the second lateral wall from moving toward the first lateral wall by a regulating member; a third step of partially varying the angle of the second lateral wall by a movable roller; and a fourth step of forming the angle of the first lateral wall by a fine-movable roller.Type: GrantFiled: January 6, 2016Date of Patent: March 19, 2019Assignee: TOKAI KOGYO CO., LTD.Inventors: Hideki Iwamoto, Akihiko Shirakawa, Mitsuru Okuda
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Publication number: 20180009149Abstract: A weather strip including a bottom wall, a first lateral wall and a second lateral wall and in which an angle between the bottom wall and the first lateral wall is constant and an angle between the bottom wall and the second lateral wall is partially varied in a longitudinal direction is manufactured. The method includes: a first step of pre-forming the angle of the first lateral wall and the angle of the second lateral wall to be constant and equal to or larger than final maximum angles; a second step of regulating a boundary between the bottom wall and the second lateral wall from moving toward the first lateral wall by a regulating member; a third step of partially varying the angle of the second lateral wall by a movable roller; and a fourth step of forming the angle of the first lateral wall by a fine-movable roller.Type: ApplicationFiled: January 6, 2016Publication date: January 11, 2018Applicant: TOKAI KOGYO CO., LTD.Inventors: Hideki IWAMOTO, Akihiko SHIRAKAWA, Mitsuru OKUDA
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Patent number: 9745194Abstract: The invention provides a method of producing a cathode active material for a lithium secondary battery, whereby it is possible to configure a lithium secondary battery in which the discharge capacity is improved and elution of lithium ions from the lithium metal phosphate is suppressed when washing the lithium metal phosphate after the same was synthesized. The method of producing a cathode active material for a lithium secondary battery includes synthesizing a lithium metal phosphate represented by a composition formula LiMPO4, wherein the element M represents one or two or more of transition metals selected from among Fe, Mn, Co and Ni, and after the synthesis, washing the lithium metal phosphate with a washing liquid containing lithium ion.Type: GrantFiled: April 25, 2012Date of Patent: August 29, 2017Assignee: SHOWA DENKO K.K.Inventors: Isao Kabe, Akihiko Shirakawa, Gaku Oriji, Akihisa Tonegawa
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Patent number: 9590246Abstract: Provided is a method for producing a lithium metal phosphate, and the method comprises initiating and allowing to proceed, in the presence of a polar solvent, a conversion reaction of a lithium ion (Li+) source such as lithium hydroxide, a divalent transition metal ion (M2+) source such as a divalent transition metal sulfate, and a phosphate ion (PO43?) source such as phosphoric acid into a lithium metal phosphate at 150° C. or higher. The conversion reaction is initiated and allowed to proceed by bringing solution A containing one of a lithium ion, a divalent transition metal ion, and a phosphate ion into contact with solution B containing the others of these ions at 150° C. or higher, or by adjusting the pH of solution C that has a pH of lower than 4 and contains a lithium ion, a divalent transition metal ion, and a phosphate ion to 4 or higher.Type: GrantFiled: September 2, 2011Date of Patent: March 7, 2017Assignee: SHOWA DENKO K.K.Inventors: Akihiko Shirakawa, Isao Kabe, Akihisa Tonegawa
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Patent number: 8968594Abstract: A method is employed for producing a positive electrode active material for a lithium secondary battery that comprises mixing lithium phosphate having a particle diameter D90 of 100 ?m or less, an M element-containing compound having a particle diameter D90 of 100 ?m or less (where, M is one type or two or more types of elements selected from the group consisting of Mg, Ca, Fe, Mn, Ni, Co, Zn, Ge, Cu, Cr, Ti, Sr, Ba, Sc, Y, Al, Ga, In, Si, B and rare earth elements) and water, adjusting the concentration of the M element with respect to water to 4 moles/L or more to obtain a raw material, and producing olivine-type LiMPO4 by carrying out hydrothermal synthesis using the raw material.Type: GrantFiled: March 24, 2014Date of Patent: March 3, 2015Assignee: Showa Denko K.K.Inventors: Akihisa Tonegawa, Akihiko Shirakawa, Isao Kabe, Gaku Oriji
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Patent number: 8915974Abstract: A capacitor element is obtained by chemically converting an anode body comprising a niobium or niobium alloy in an electrolyte solution, which is obtained by dissolving an oxygen supply agent such as hydrogen peroxide, a freezing point depressant such as ethylene glycol, and an electrolyte such as phosphoric acid in water, at a solution temperature lower than the freezing point of a solution having the composition of the electrolyte solution excluding the freezing point depressant, for forming a dielectric layer in the surface of the anode body or repairing a dielectric layer formed in the surface of the anode body. An electrolytic capacitor is obtained by forming a cathode on the dielectric layer of the capacitor element, electrically connecting the anode body and the cathode respectively to external terminals, and then sealing them.Type: GrantFiled: October 29, 2009Date of Patent: December 23, 2014Assignee: Showa Denko K.K.Inventors: Yoshinori Shibuya, Akihiko Shirakawa, Masahiro Suzuki
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Publication number: 20140203218Abstract: A method is employed for producing a positive electrode active material for a lithium secondary battery that comprises mixing lithium phosphate having a particle diameter D90 of 100 ?m or less, an M element-containing compound having a particle diameter D90 of 100 ?m or less (where, M is one type or two or more types of elements selected from the group consisting of Mg, Ca, Fe, Mn, Ni, Co, Zn, Ge, Cu, Cr, Ti, Sr, Ba, Sc, Y, Al, Ga, In, Si, B and rare earth elements) and water, adjusting the concentration of the M element with respect to water to 4 moles/L or more to obtain a raw material, and producing olivine-type LiMPO4 by carrying out hydrothermal synthesis using the raw material.Type: ApplicationFiled: March 24, 2014Publication date: July 24, 2014Applicant: SHOWA DENKO K.K.Inventors: Akihisa TONEGAWA, Akihiko SHIRAKAWA, Isao KABE, Gaku ORIJI
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Publication number: 20140199475Abstract: A positive electrode active material for a lithium secondary battery having a core portion and a shell layer is employed in which the core portion is represented by Lix1M1y1Pz1O4 (where, M1 represents an element such as Mg, Ca, Fe or Mn, and the letters x1, y1 and z1 representing composition ratios are respectively such that 0<x1<2, 0<y1<1.5 and 0.9<z1<1.1), the shell layer is composed of one or more layers represented by Lix2M2y2Pz2O4 (where, M2 represents one type or two or more types of elements selected from the group consisting of Mg, Fe, Ni, Co and Al, and the letters x2, y2 and z2 representing composition ratios are respectively such that 0<x2<2, 0<y2<1.5 and 0.9<z2<1.1).Type: ApplicationFiled: March 18, 2014Publication date: July 17, 2014Applicant: SHOWA DENKO K.K.Inventors: Akihisa TONEGAWA, Akihiko SHIRAKAWA, Isao KABE, Gaku ORIJI
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Publication number: 20140056797Abstract: The invention provides a method of producing a cathode active material for a lithium secondary battery, whereby it is possible to configure a lithium secondary battery in which the discharge capacity is improved and elution of lithium ions from the lithium metal phosphate is suppressed when washing the lithium metal phosphate after the same was synthesized. The method of producing a cathode active material for a lithium secondary battery includes synthesizing a lithium metal phosphate represented by a composition formula LiMPO4, wherein the element M represents one or two or more of transition metals selected from among Fe, Mn, Co and Ni, and after the synthesis, washing the lithium metal phosphate with a washing liquid containing lithium ion.Type: ApplicationFiled: April 25, 2012Publication date: February 27, 2014Applicant: SHOWA DENKO K.K.Inventors: Isao Kabe, Akihiko Shirakawa, Gaku Oriji, Akihisa Tonegawa
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Publication number: 20130251997Abstract: A process for producing a single crystal barium titanate including reacting a titanium oxide sol obtained by a wet process and a water-soluble barium compound under the presence of a basic compound in an aqueous reaction mixture at a pH of at least 11 to form a slurry containing barium titanate. The aqueous reaction mixture is subjected to a solid-liquid separation to separate the barium titanate from the slurry. The basic compound is removed as a gas from the barium titanate, and the barium titanate is fired at 300-1200° C.Type: ApplicationFiled: May 16, 2013Publication date: September 26, 2013Applicant: SHOWA DENKO K.K.Inventors: Akihiko SHIRAKAWA, Hitoshi YOKOUCHI
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Publication number: 20130236385Abstract: Provided is a method for producing a lithium metal phosphate, and the method comprises initiating and allowing to proceed, in the presence of a polar solvent, a conversion reaction of a lithium ion (Li+) source such as lithium hydroxide, a divalent transition metal ion (M2+) source such as a divalent transition metal sulfate, and a phosphate ion (PO43?) source such as phosphoric acid into a lithium metal phosphate at 150° C. or higher. The conversion reaction is initiated and allowed to proceed by bringing solution A containing one of a lithium ion, a divalent transition metal ion, and a phosphate ion into contact with solution B containing the others of these ions at 150° C. or higher, or by adjusting the pH of solution C that has a pH of lower than 4 and contains a lithium ion, a divalent transition metal ion, and a phosphate ion to 4 or higher.Type: ApplicationFiled: September 2, 2011Publication date: September 12, 2013Applicant: SHOWA DENKO K.K.Inventors: Akihiko Shirakawa, Isao Kabe, Akihisa Tonegawa
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Patent number: 8524324Abstract: The invention relates to a method for a complex oxide film having a high relative dielectric constant formed on a substrate surface by wet-treatment method and a production process of the complex oxide film comprising a step of washing the complex oxide film with an acid solution of pH 5 or less to thereby reduce salts in the film. Further, the invention relates to a dielectric material and a piezoelectric material containing the complex oxide film, a capacitor and a piezoelectric element including the material, and a electronic device comprising the element.Type: GrantFiled: July 28, 2006Date of Patent: September 3, 2013Assignee: Showa Denko K.K.Inventors: Akihiko Shirakawa, Hirofumi Fukunaga, Chunfu Yu
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Patent number: 8486492Abstract: The invention aims at providing a complex oxide film having a high relative dielectric constant and a high voltage resistance, whose film thickness can be arbitrarily controlled, and a manufacturing method thereof, a composite body comprising the complex oxide film and a manufacturing method thereof, a dielectric or piezoelectric material comprising the complex oxide film or composite body, a capacitor or piezoelectric element comprising the complex oxide film advantageous to improve voltage resistance, and an electronic device equipped with the same, without involving any complicated or large scale equipment. The complex oxide film can be obtained by forming a metal oxide film containing a titanium element on a substrate surface and then allowing a solution containing strontium ion to react with the metal oxide film. A capacitor including the complex oxide film as dielectric material and a piezoelectric element including it as piezoelectric material can be produced.Type: GrantFiled: December 27, 2006Date of Patent: July 16, 2013Assignee: Showa Denko K.K.Inventor: Akihiko Shirakawa
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Patent number: 8486493Abstract: A complex oxide film is provided having a high relative dielectric constant and capacitance having low temperature-dependency. The film thickness can be arbitrarily controlled. A manufacturing method thereof, a composite body comprising the complex oxide film and a manufacturing method thereof are provided. The complex oxide film containing titanium element and calcium element can be obtained by forming a metal oxide film containing titanium element on a substrate surface and then allowing a solution containing calcium ion to react with the metal oxide layer. A capacitor including the complex oxide film as dielectric material and a piezoelectric element including it as piezoelectric material can be produced.Type: GrantFiled: December 27, 2006Date of Patent: July 16, 2013Assignee: Showa Denko K.K.Inventor: Akihiko Shirakawa
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Publication number: 20130128473Abstract: There is provided a method for producing a capacitor which is capable of producing a capacitor having a high withstand voltage and low leakage current, the method for producing a capacitor which is a method for producing a capacitor having a substrate serving as one electrode, a dielectric layer formed on top of the substrate, and the other electrode formed on top of the dielectric layer, the method including a step for forming an amorphous titanium oxide layer which is to become the dielectric layer on top of the substrate by anodizing the substrate, which is composed of titanium or titanium alloy, in an electrolyte solution containing hydrogen peroxide and having a temperature of 3° C. or less; and a step for forming the other electrode on top of the dielectric layer.Type: ApplicationFiled: January 14, 2013Publication date: May 23, 2013Inventors: Akihiko SHIRAKAWA, Koji TOKITA, Chunfu YU
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Patent number: 8377148Abstract: There is provided a method for producing a capacitor which is capable of producing a capacitor having a high withstand voltage and low leakage current, the method for producing a capacitor which is a method for producing a capacitor having a substrate serving as one electrode, a dielectric layer formed on top of the substrate, and the other electrode formed on top of the dielectric layer, the method including a step for forming an amorphous titanium oxide layer which is to become the dielectric layer on top of the substrate by anodizing the substrate, which is composed of titanium or titanium alloy, in an electrolyte solution containing hydrogen peroxide and having a temperature of 3° C. or less; and a step for forming the other electrode on top of the dielectric layer.Type: GrantFiled: April 16, 2010Date of Patent: February 19, 2013Assignee: Showa Denko K.K.Inventors: Akihiko Shirakawa, Koji Tokita, Chunfu Yu
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Patent number: 8254082Abstract: The capacitor material of the present invention is comprised by laminating a titanium dioxide layer and a titanate compound layer having perovskite crystals.Type: GrantFiled: January 25, 2008Date of Patent: August 28, 2012Assignee: Showa Denko K.K.Inventors: Akihiko Shirakawa, Ryuichi Mitsumoto, Koji Tokita
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Patent number: 8052954Abstract: A barium calcium titanate of the present invention has a remarkable effect that a fine barium calcium titanate powder having excellent dispersibility, reduced impurities and high crystallinity and being solid-dissolved at an arbitrary ratio, and a production process thereof are provided. The barium calcium titanate represented by the compositional formula: (Ba(1-X)CaX)YTiO3 (wherein 0<X<0.2 and 0.98?Y?1.02), which contains 3 mol % or less (including 0 mol %) of an orthorhombic perovskite compound and in which the specific surface area D is from 1 to 100 m2/g.Type: GrantFiled: August 26, 2005Date of Patent: November 8, 2011Assignee: Showa Denko K.K.Inventors: Tadatoshi Kurozumi, Akihiko Shirakawa
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Publication number: 20110239424Abstract: A capacitor element is obtained by chemically converting an anode body comprising a niobium or niobium alloy in an electrolyte solution, which is obtained by dissolving an oxygen supply agent such as hydrogen peroxide, a freezing point depressant such as ethylene glycol, and an electrolyte such as phosphoric acid in water, at a solution temperature lower than the freezing point of a solution having the composition of the electrolyte solution excluding the freezing point depressant, for forming a dielectric layer in the surface of the anode body or repairing a dielectric layer formed in the surface of the anode body. An electrolytic capacitor is obtained by forming a cathode on the dielectric layer of the capacitor element, electrically connecting the anode body and the cathode respectively to external terminals, and then sealing them.Type: ApplicationFiled: October 29, 2009Publication date: October 6, 2011Inventors: Yoshinori Shibuya, Akihiko Shirakawa, Masahiro Suzuki