Patents by Inventor Koichi Takahama
Koichi Takahama 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: 9138734Abstract: Object of the present invention is to provide visible light-responsive photocatalyst coating material which can form a coating film exhibiting superior allergen inactivation property through irradiation of visible light. The visible light-responsive photocatalyst coating material comprises: photocatalyst material having visible light-activity composed of metal oxide particle with divalent copper salt supported on the surface thereof, said metal oxide particle having optical semiconductor-characteristics and potential of valence band of said metal oxide particle being 3[V] or more (vs. SHE, pH=0); binder component including component having siloxane bond or component forming siloxane bond through reaction; and chloride ionic compound. When visible light is irradiated to the coating film, the metal oxide particle exhibits photocatalyst activity in the presence of the copper-divalent ion and chloride ion, thereby significantly high allergen inactivation property is exhibited.Type: GrantFiled: August 26, 2010Date of Patent: September 22, 2015Assignees: PANASONIC CORPORATION, THE UNIVERSITY OF TOKYOInventors: Shinichiro Miki, Koichi Takahama, Kensaku Kinugawa, Kazuhito Hashimoto, Kayano Sunada
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Patent number: 8603302Abstract: A divalent copper salt and/or trivalent iron salt is supported on a surface of a metal ion-doped titanium oxide obtained by doping titanium oxide with metal ions to give a metal ion-doped titanium oxide with a valence band potential of 3 V or more (vs. SHE, pH=0) and a bandgap of 3 V or less between the valence band and an energy level of electrons excited from the valence band (including conduction band minimum potential and isolated potential). The metal ion-doped titanium oxide can be made to exhibit strong oxidative decomposition activity when irradiated with visible light based on the fact the divalent copper salt or trivalent iron salt functions as a catalyst for multi-electron reduction of oxygen.Type: GrantFiled: October 29, 2009Date of Patent: December 10, 2013Assignees: The University of Tokyo, Panasonic CorporationInventors: Kazuhito Hashimoto, Hiroshi Irie, Huogen Yu, Kazuhide Kamiya, Koichi Takahama, Shinichiro Miki, Mitsuo Yaguchi
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Patent number: 8536084Abstract: The present invention provides a tungsten trioxide microparticle carrying on its surface divalent copper salt. The divalent copper salt is utilized to perform a multi-electron reduction of oxygen. The tungsten trioxide exhibits a high oxidative decomposition activity when exposed to visible light.Type: GrantFiled: March 19, 2009Date of Patent: September 17, 2013Assignees: The University of Tokyo, Panasonic CorporationInventors: Kazuhito Hashimoto, Hiroshi Irie, Syuhei Miura, Kazuhide Kamiya, Shinichiro Miki, Koichi Takahama, Mitsuo Yaguchi
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Publication number: 20120237396Abstract: Object of the present invention is to provide visible light-responsive photocatalyst coating material which can form a coating film exhibiting superior allergen inactivation property through irradiation of visible light. The visible light-responsive photocatalyst coating material comprises: photocatalyst material having visible light-activity composed of metal oxide particle with divalent copper salt supported on the surface thereof, said metal oxide particle having optical semiconductor-characteristics and potential of valence band of said metal oxide particle being 3[V] or more (vs. SHE, pH=0); binder component including component having siloxane bond or component forming siloxane bond through reaction; and chloride ionic compound. When visible light is irradiated to the coating film, the metal oxide particle exhibits photocatalyst activity in the presence of the copper-divalent ion and chloride ion, thereby significantly high allergen inactivation property is exhibited.Type: ApplicationFiled: August 26, 2010Publication date: September 20, 2012Applicants: THE UNIVERSITY OF TOKYO, PANASONIC CORPORATIONInventors: Shinichiro Miki, Koichi Takahama, Kensaku Kinugawa, Kazuhito Hashimoto, Kayano Sunada
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Publication number: 20110198210Abstract: A divalent copper salt and/or trivalent iron salt is supported on a surface of a metal ion-doped titanium oxide obtained by doping titanium oxide with metal ions to give a metal ion-doped titanium oxide with a valence band potential of 3 V or more (vs. SHE, pH=0) and a bandgap of 3 V or less between the valence band and an energy level of electrons excited from the valence band (including conduction band minimum potential and isolated potential). The metal ion-doped titanium oxide can be made to exhibit strong oxidative decomposition activity when irradiated with visible light based on the fact the divalent copper salt or trivalent iron salt functions as a catalyst for multi-electron reduction of oxygen.Type: ApplicationFiled: October 29, 2009Publication date: August 18, 2011Inventors: Kazuhito Hashimoto, Hiroshi Irie, Huogen Yu, Kazuhide Kamiya, Koichi Takahama, Shinichiro Miki, Mitsuo Yaguchi
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Publication number: 20110005916Abstract: The present invention provides a tungsten trioxide microparticle carrying on its surface divalent copper salt. The divalent copper salt is utilized to perform a multi-electron reduction of oxygen. The tungsten trioxide exhibits a high oxidative decomposition activity when exposed to visible light.Type: ApplicationFiled: March 19, 2009Publication date: January 13, 2011Applicants: The University of Tokyo, Panasonic Electric Works Co., Ltd.Inventors: Kazuhito Hashimoto, Hiroshi Irie, Syuhei Miura, Kazuhide Kamiya, Shinichiro Miki, Koichi Takahama, Mitsuo Yaguchi
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Patent number: 7854508Abstract: A plastic lens includes: a plastic lens base material; a hard coat layer formed on the plastic lens base material; an organic antireflection film formed on the hard coat layer; and a primer layer between the plastic lens base material and the hard coat layer. The plastic lens base material contains at least a sulfur atom. The hard coat layer contains at least: fine metal oxide particles containing a titanium oxide having a rutile-type crystalline structure; and an organosilicon compound represented by a general formula of R1SiX13. The antireflection film contains a coating composition containing at least: an organosilicon compound represented by a general formula of XmR23?mSi—Y—SiR23?mXm; an epoxy group-containing organic compound containing one or more epoxy group in a molecule; and fine silica particles with average particle size of 1 to 150 nm, the antireflection film having a refractive index lower than that of the hard coat layer by 0.10 or more.Type: GrantFiled: September 15, 2006Date of Patent: December 21, 2010Assignees: Seiko Epson Corporation, Panasonic Electric Works Co., Ltd.Inventors: Mikito Nakajima, Katsuyoshi Takeshita, Yusuke Kutsukake, Jun Kinoshita, Shuji Naito, Koichi Takahama, Hiroshi Yokogawa, Takeyuki Yamaki, Akira Tsujimoto, Ryozo Fukuzaki
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Patent number: 7582351Abstract: There is provided a composite thin film-holding substrate in which a composite thin film (4) comprising a filler (2) having a refractive index lower than that of a substrate (1) and a binder (3) having a refractive index higher than that of the filler (2) is formed on a surface of the substrate (1). Light is efficiently scattered when passing through the composite thin film (3) which comprises the filler (2) and the binder (3) having different refractive indexes from each other. In addition, the refractive index of a composite thin film (4) comprising a filler (2) having a low refractive index is low. As a result, the discharge efficiency of light which passes through the composite thin film (4) from the substrate (1) to the external is improved.Type: GrantFiled: October 24, 2002Date of Patent: September 1, 2009Assignee: Panasonic Electric Works Co., Ltd.Inventors: Hiroshi Yokogawa, Masaru Yokoyama, Kenji Kawano, Norihiro Itou, Koichi Takahama, Takeyuki Yamaki, Akira Tsujimoto, Yasuhisa Kishigami, Nobuhiro Ide
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Publication number: 20090040457Abstract: A plastic lens includes: a plastic lens base material; a hard coat layer formed on the plastic lens base material; an organic antireflection film formed on the hard coat layer; and a primer layer between the plastic lens base material and the hard coat layer. The plastic lens base material contains at least a sulfur atom. The hard coat layer contains at least: fine metal oxide particles containing a titanium oxide having a rutile-type crystalline structure; and an organosilicon compound represented by a general formula of R1SiX13. The antireflection film contains a coating composition containing at least: an organosilicon compound represented by a general formula of XmR23-mSi—Y—SiR23-mXm; an epoxy group-containing organic compound containing one or more epoxy group in a molecule; and fine silica particles with average particle size of 1 to 150 nm, the antireflection film having a refractive index lower than that of the hard coat layer by 0.10 or more.Type: ApplicationFiled: September 15, 2006Publication date: February 12, 2009Applicants: Seiko Epson Corporation, Matsushita Electric Works, Ltd.Inventors: Mikito Nakajima, Katsuyoshi Takeshita, Yusuke Kutsukake, Jun Kinoshita, Shuji Naito, Koichi Takahama, Hiroshi Yokogawa, Takeyuki Yamaki, Akira Tsujimoto, Ryozo Fukuzaki
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Publication number: 20070190305Abstract: The present invention provide a coating material composition comprising at least fine hollow particles and a matrix-forming material, wherein when the coating material composition is applied and dried to form a coating film having a low refractive index, the matrix-forming material forms a porous matrix.Type: ApplicationFiled: March 30, 2007Publication date: August 16, 2007Applicant: Matsushita Electric Works, Ltd.Inventors: Takeyuki Yamaki, Hiroshi Yokogawa, Koichi Takahama, Masaru Yokoyama, Akira Tsujimoto, Norihiro Itou, Kenji Kawano, Yasuhisa Kishigami, Nobuhiro Ide
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Publication number: 20050109238Abstract: The present invention provide a coating material composition comprising at least fine hollow particles and a matrix-forming material, wherein when the coating material composition is applied and dried to form a coating film having a low refractive index, the matrix-forming material forms a porous matrix.Type: ApplicationFiled: October 23, 2002Publication date: May 26, 2005Inventors: Takeyuki Yamaki, Hiroshi Yokogawa, Koichi Takahama, Masaru Yokoyama, Akira Tsujimoto, Norihiro Itou, Kenji Kawano, Yasuhisa Kishigami, Nobuhiro Ide
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Publication number: 20040253427Abstract: There is provided a composite thin film-holding substrate in which a composite thin film (4) comprising a filler (2) having a refractive index lower than that of a substrate (1) and a binder (3) having a refractive index higher than that of the filler (2) is formed on a surface of the substrate (1). Light is efficiently scattered when passing through the composite thin film (3) which comprises the filler (2) and the binder (3) having different refractive indexes from each other. In addition, the refractive index of a composite thin film (4) comprising a filler (2) having a low refractive index is low. As a result, the discharge efficiency of light which passes through the composite thin film (4) from the substrate (1) to the external is improved.Type: ApplicationFiled: April 23, 2004Publication date: December 16, 2004Inventors: Hiroshi Yokogawa, Masaru Yokoyama, Kenji Kawano, Norihiro Itou, Koichi Takahama, Takeyuki Yamaki, Akira Tsujimoto, Yasuhisa Kishigama, Nobuhiro Ide
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Patent number: 6303229Abstract: The present invention provides a process for forming a hydrophilic inorganic coated film on a surface of a base material, the process comprising the steps of: (1) preparing an inorganic coating composition which contains, as a major component, a silicone resin obtained by hydrolyzing and condensation-polymerizing only the tetra-functional alkoxysilane represented by the formula: Si(OR)4 [wherein R represents an alkyl group having carbon atoms up to and including 7 or an aryl group], and has a total solid content of not more than 5% by weight; (2) applying the inorganic coating composition to a surface of the base material to form a coated layer; and (3) drying and curing the coated layer to form a cured coated film having a thickness of 0.01 to 0.5 &mgr;m. The hydrophilic inorganic coated film formed by the process of the present invention is highly hydrophilic just after the film is formed, even in the case that it is not irradiated with ultraviolet rays.Type: GrantFiled: December 8, 1999Date of Patent: October 16, 2001Assignee: Matsushita Electric Works, Ltd.Inventors: Koichi Takahama, Minoru Inoue, Junko Ikenaga, Shoichi Nakamoto
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Publication number: 20010008696Abstract: The present invention provides a process for forming a hydrophilic inorganic coated film on a surface of a base material, the process comprising the steps of: (1) preparing an inorganic coating composition which contains, as a major component, a silicone resin obtained by hydrolyzing and condensation-polymerizing only the tetra-functional alkoxysilane represented by the formula: Si(OR)4 [wherein R represents an alkyl group having carbon atoms up to and including 7 or an aryl group], and has a total solid content of not more than 5% by weight; (2) applying the inorganic coating composition to a surface of the base material to form a coated layer; and (3) drying and curing the coated layer to form a cured coated film having a thickness of 0.01 to 0.5 &mgr;m. The hydrophilic inorganic coated film formed by the process of the present invention is highly hydrophilic just after the film is formed, even in the case that it is not irradiated with ultraviolet rays.Type: ApplicationFiled: December 8, 1999Publication date: July 19, 2001Inventors: KOICHI TAKAHAMA, MINORU INOUE, JUNKO IKENAGA, SHOICHI NAKAMOTO
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Patent number: 6221498Abstract: An antifouling silicone emulsion coating-composition comprising following components (A), (B), (C) and (D), an amount of the component (C) incorporated being in the range of 5 to 80% by weight relative to the total solid contents in the composition: (A) partially hydrolyzed organosiloxane with a weight-average molecular weight of 600 to 5,000 (determined using a polystyrene calibration curve), represented by the average formula (I): R2aSiOb(OR1)c(OH)d wherein R1 and R2 represent a monovalent hydrocarbon group; a, b, c and d are numerals satisfying the following relationships: a+2b+c+d=4, 0≦a<3, 0<b<2, 0<c<4, and 0<d<4; (B) nonionic or anionic surface active agent; (C) photo-semiconductor; and (D) water.Type: GrantFiled: January 11, 1999Date of Patent: April 24, 2001Assignee: Matsushita Electric Works, Ltd.Inventors: Koichi Takahama, Takeyuki Yamaki, Minoru Inoue, Akiharu Goto, Junko Ikenaga, Hirotsugu Kishimoto
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Patent number: 6165619Abstract: The present invention provides a functional coated product having excellent adhesion properties of a coating to a substrate, hardly causing the deterioration of the substrate and the coating due to a photocatalyst, hardly having dirt because the smoothness of the surface coating is high, and having high photocatalytic action; a method for producing the same and the use thereof.The coated product of the present invention has the first coating layer comprising a cured coating made of an acryl-modified silicone resin coating material, which is formed on the surface of the substrate, and the second coating layer comprising a cured coating made of a functional coating material containing the photocatalyst, which is formed con the surface of the first coating layer. When producing such a coated product, the acryl-modified silicone resin coating material is applied to the surface of the substrate as the first coating layer and it is semi-cured.Type: GrantFiled: August 5, 1998Date of Patent: December 26, 2000Assignee: Matsushita Electric Works, Ltd.Inventors: Junko Ikenaga, Takeyuki Yamaki, Koichi Takahama, Toshiharu Sako, Hirotsugu Kishimoto
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Patent number: 5830387Abstract: A hydrophobic aerogel is fabricated by reacting a polymer having a skeleton structure of (SiO.sub.2).sub.n with a hydrophobic agent having hydrophobic groups as well as functional groups reactive to silanol groups to obtain a denatured polymer, forming a gel consisting of two phase of a dispersing medium and the denatured polymer which was performed a hydrophobic treatment, and then, supercritically drying the gel at temperature and pressure above a critical point of the dispersing medium. The hydrophobic aerogel has improved characteristics free from deterioration in light transmissivity as well as lowered thermal resistance and also free from a dimensional variation such as shrinkage which would otherwise occur by contact with moisture, so that it can maintain the excellent characteristics for long time periods. Particularly, the aerogel is useful as a material having excellent light transmissivity and thermal resistance.Type: GrantFiled: August 12, 1992Date of Patent: November 3, 1998Assignee: Matsushita Electric Works, Ltd.Inventors: Hiroshi Yokogawa, Masaru Yokoyama, Koichi Takahama, Yuriko Uegaki
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Patent number: 5811192Abstract: There is provided a substrate of which the surface is coated with a titanium dioxide film having a photocatalytic activity, which substrate is obtained by:depositing titanium dioxide in a film form on a surface of a substrate by contacting the substrate with a reaction solution containing ammonium titanium fluoride, water and an additive which shifts the following equilibrium reaction:(NH.sub.4).sub.2 TiF.sub.6 +2H.sub.2 O<=>TiO.sub.2 +4HF+2NH.sub.4 Ftoward a right side, andcalcining the deposited titanium dioxide film.Type: GrantFiled: September 12, 1996Date of Patent: September 22, 1998Assignee: Matsushita Electric Works, Ltd.Inventors: Koichi Takahama, Hirotsugu Kishimoto, Takaharu Nakagawa, Shigehito Deki, Noboru Hashimoto
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Patent number: 5496527Abstract: A hydrophobic aerogel having excellent transparency is formed by the following process of the present invention. That is, a first gel having a SiO.sub.2 skeleton structure is prepared by hydrolysis and condensation of an alkoxysilane compound in the presence of a solvent. The solvent contained in the first gel is replaced at least partially with a medium to form a second gel. The second gel is reacted with a hydrophobic agent having hydrophobic groups as well as functional groups reactive with silanol groups under a supercritical condition of the medium to form a hydrophobic gel. The medium contained in the hydrophobic aerogel is removed by a supercritical drying method, so that the hydrophobic aerogel having improved transparency and an extremely fine porous structure is obtained.Type: GrantFiled: April 28, 1994Date of Patent: March 5, 1996Assignee: Matsushita Electric Works. Ltd.Inventors: Hiroshi Yokogawa, Masaru Yokoyama, Koichi Takahama, Yuriko Uegaki
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Patent number: RE38850Abstract: The present invention provides a functional coated product having excellent adhesion properties of a coating to a substrate, hardly causing the deterioration of the substrate and the coating due to a photocatalyst, hardly having dirt because the smoothness of the surface coating is high, and having high photocatalytic action; a method for producing the same and the use thereof. The coated product of the present invention has the first coating layer comprising a cured coating made of an acryl-modified silicone resin coating material, which is formed on the surface of the substrate, and the second coating layer comprising a cured coating made of a functional coating material containing the photocatalyst, which is formed con the surface of the first coating layer. When producing such a coated product, the acryl-modified silicone resin coating material is applied to the surface of the substrate as the first coating layer and it is semi-cured.Type: GrantFiled: December 11, 1997Date of Patent: October 25, 2005Assignee: Matsushita Electric Works, Ltd.Inventors: Junko Ikenaga, Takeyuki Yamaki, Koichi Takahama, Toshiharu Sako, Hirotsugu Kishimoto