Patents by Inventor Atsushi Tofuku

Atsushi Tofuku 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: 10450471
    Abstract: There is provided a method for producing a heat-ray shielding dispersion body in which heat-ray shielding particles having an excellent hygrothermal resistance are dispersed in a medium, a heat-ray shielding body, and a method for producing them. The heat-ray shielding dispersion body and the heat shielding body are produced by mixing and dispersing zinc hydroxide particles and composite tungsten oxide particles expressed by a general formula MYWOZ and having a hexagonal crystal structure, and molding and solidifying such a dispersion.
    Type: Grant
    Filed: July 11, 2013
    Date of Patent: October 22, 2019
    Assignee: SUMITOMO METAL MINING CO., LTD.
    Inventors: Kayo Yabuki, Atsushi Tofuku
  • Patent number: 10384423
    Abstract: A heat-ray shielding lamination structure composed of two laminated plates of plate glass, plastic, or plastic containing particles having a heat-ray shielding function and metal compounds, interposing an interlayer containing particles having a heat-ray shielding function and metal compounds, wherein the particles are composite tungsten oxide particles of formula MYWOZ (0.001?Y?1.0, 2.2?Z?3.0), wherein M is at least one of Cs, Rb, K, and Tl, having a hexagonal crystal structure, with a particle size between 1 and 800 nm, the metal compounds are metal salts of carboxylic acids, metal carbonates, metal carbonate hydroxides, or metal hydroxides, and are contained in an amount between 1 pts.wt. and 100 pts.wt. based on 100 pts.wt. of the composite tungsten oxide particles.
    Type: Grant
    Filed: June 10, 2013
    Date of Patent: August 20, 2019
    Assignee: SUMITOMO METAL MINING CO., LTD.
    Inventors: Kayo Yabuki, Atsushi Tofuku
  • Publication number: 20150301243
    Abstract: There is provided an imaging device capable of exhibiting high absorption to a light with a wavelength range of 700 to 1500 nm in a near-infrared region to IR region, while having high transmittance to a visible light, and an imaging device in which the infrared absorption filter is used, and is provided a near-infrared absorption filter including composite tungsten oxide particles expressed by a general formula NayWOz (satisfying 0.3?y?1.1, 2.2?z?3.0), as near-infrared shielding particles.
    Type: Application
    Filed: November 29, 2013
    Publication date: October 22, 2015
    Inventors: Mika OKADA, Atsushi TOFUKU
  • Publication number: 20150197646
    Abstract: There is provided a method for producing a heat-ray shielding dispersion body in which heat-ray shielding particles having an excellent hygrothermal resistance are dispersed in a medium, a heat-ray shielding body, and a method for producing them. The heat-ray shielding dispersion body and the heat shielding body are produced by mixing and dispersing zinc hydroxide particles and composite tungsten oxide particles expressed by a general formula MYWOZ and having a hexagonal crystal structure, and molding and solidifying such a dispersion.
    Type: Application
    Filed: July 11, 2013
    Publication date: July 16, 2015
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Kayo Yabuki, Atsushi Tofuku
  • Publication number: 20150158274
    Abstract: A heat-ray shielding lamination structure composed of two laminated plates of plate glass, plastic, or plastic containing particles having a heat-ray shielding function, metal salts of carboxylic acids, metal carbonate, metal hydroxides carbonates, and metal hydroxides, interposing an interlayer containing particles having a heat-ray shielding function and one or more kinds of metal salts of carboxylic acids, metal carbonate, metal hydroxides carbonates, and metal hydroxides, wherein the particles are composite tungsten oxide particles expressed by general formula MYWOZ (0.001?Y?1.0, 2.2?Z?3.0), element M is one or more kinds of Cs, Rb, K, Tl, having a hexagonal crystal structure, with a particle size between 1 and 800 nm, and the metal salts of carboxylic acids, metal carbonate, metal hydroxides carbonates, and metal hydroxides, are contained in an amount between 1 pts.wt. and 100 pts.wt. based on 100 pts.wt. of the composite tungsten oxide particles.
    Type: Application
    Filed: June 10, 2013
    Publication date: June 11, 2015
    Inventors: Kayo Yabuki, Atsushi Tofuku
  • Patent number: 8883312
    Abstract: Zinc oxide particles having high transparency in visible light and high shielding properties in a ultraviolet region, with surface treatment of inactivating photocatalytic activity applied thereto, and a dispersion thereof. A manufacturing method of surface treated zinc oxide particles, including: a first step of mixing a dispersion liquid with zinc oxide particles dispersed in a solvent, and silicone resin having polysiloxane bond with at least one or more silicon atoms having a silanol group (Si—OH) and/or alkoxy silyl group (Si—OR, wherein R is alkyl group); obtaining a mixed solution containing a surface treated zinc oxide particles precursor, with the silicone resin adsorbed on the surface of each zinc oxide particle and the solvent, and drying and solidifying the mixed solution by applying heat treatment thereto, to thereby manufacture a dried body; and a second step of pulverizing the dried body, to thereby manufacture the surface treated zinc oxide particles.
    Type: Grant
    Filed: February 9, 2012
    Date of Patent: November 11, 2014
    Assignee: Sumitomo Metal Mining Co., Ltd.
    Inventors: Kayo Yabuki, Atsushi Tofuku
  • Patent number: 8470212
    Abstract: There is provided infrared shielding nanoparticles having excellent water-resistant property and excellent infrared shielding property, which is the infrared shielding nanoparticles of composite tungsten oxide expressed by a general formula WyOz and/or a general formula MxWyOz, with an average primary particle size of the nanoparticle being 1 nm or more and 800 nm or less, and a surface of the nanoparticle being coated with tetrafunctional silane compound or its hydrolysis product and/or an organic metal compound.
    Type: Grant
    Filed: November 13, 2008
    Date of Patent: June 25, 2013
    Assignee: Sumitomo Metal Mining Co., Ltd.
    Inventor: Atsushi Tofuku
  • Patent number: 8304070
    Abstract: Zinc oxide particles having high transparency in visible light and high shielding properties in a ultraviolet region, with surface treatment of inactivating photocatalytic activity applied thereto, and a dispersion thereof. A manufacturing method of surface treated zinc oxide particles, including: a first step of mixing a dispersion liquid with zinc oxide particles dispersed in a solvent, and silicone resin having polysiloxane bond with at least one or more silicon atoms having a silanol group (Si—OH) and/or alkoxy silyl group (Si—OR, wherein R is alkyl group); obtaining a mixed solution containing a surface treated zinc oxide particles precursor, with the silicone resin adsorbed on the surface of each zinc oxide particle and the solvent, and drying and solidifying the mixed solution by applying heat treatment thereto, to thereby manufacture a dried body; and a second step of pulverizing the dried body, to thereby manufacture the surface treated zinc oxide particles.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: November 6, 2012
    Assignee: Sumitomo Metal Mining Co., Ltd.
    Inventors: Kayo Yabuki, Atsushi Tofuku
  • Publication number: 20120141737
    Abstract: Zinc oxide particles having high transparency in visible light and high shielding properties in a ultraviolet region, with surface treatment of inactivating photocatalytic activity applied thereto, and a dispersion thereof. A manufacturing method of surface treated zinc oxide particles, including: a first step of mixing a dispersion liquid with zinc oxide particles dispersed in a solvent, and silicone resin having polysiloxane bond with at least one or more silicon atoms having a silanol group (Si—OH) and/or alkoxy silyl group (Si—OR, wherein R is alkyl group); obtaining a mixed solution containing a surface treated zinc oxide particles precursor, with the silicone resin adsorbed on the surface of each zinc oxide particle and the solvent, and drying and solidifying the mixed solution by applying heat treatment thereto, to thereby manufacture a dried body; and a second step of pulverizing the dried body, to thereby manufacture the surface treated zinc oxide particles.
    Type: Application
    Filed: February 9, 2012
    Publication date: June 7, 2012
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Kayo YABUKI, Atsushi TOFUKU
  • Patent number: 8174190
    Abstract: To improve an optical property of a near-infrared-absorbing PDP filter and suppress a manufacturing cost. The present invention provides a dispersion liquid for near-infrared-absorbing adhesive-body. The dispersion liquid includes, in a solvent, one or more types of nanoparticles selected from a tungsten oxide nanoparticle and a composite tungsten oxide nanoparticle, and an acryl-based polymer dispersant is added to the dispersion liquid. The average dispersed nanoparticle diameter of the tungsten oxide nanoparticles and the composite tungsten oxide nanoparticles is equal to or smaller than 800 nm.
    Type: Grant
    Filed: November 4, 2008
    Date of Patent: May 8, 2012
    Assignee: Sumitomo Metal Mining Co., Ltd.
    Inventors: Yosuke Ota, Atsushi Tofuku
  • Publication number: 20110297899
    Abstract: There is provided infrared shielding nanoparticles having excellent water-resistant property and excellent infrared shielding property, which is the infrared shielding nanoparticles of composite tungsten oxide expressed by a general formula WyOz and/or a general formula MxWyOz, with an average primary particle size of the nanoparticle being 1 nm or more and 800 nm or less, and a surface of the nanoparticle being coated with tetrafunctional silane compound or its hydrolysis product and/or an organic metal compound.
    Type: Application
    Filed: November 13, 2008
    Publication date: December 8, 2011
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventor: Atsushi Tofuku
  • Publication number: 20100286322
    Abstract: Zinc oxide particles having high transparency in visible light and high shielding properties in a ultraviolet region, with surface treatment of inactivating photocatalytic activity applied thereto, and a dispersion thereof. A manufacturing method of surface treated zinc oxide particles, including: a first step of mixing a dispersion liquid with zinc oxide particles dispersed in a solvent, and silicone resin having polysiloxane bond with at least one or more silicon atoms having a silanol group (Si—OH) and/or alkoxy silyl group (Si—OR, wherein R is alkyl group); then obtaining a mixed solution containing a surface treated zinc oxide particles precursor, with the silicone resin adsorbed on the surface of each zinc oxide particle and the solvent, and drying and solidifying the mixed solution by applying heat treatment thereto, to thereby manufacture a dried body; and a second step of pulverizing the dried body, to thereby manufacture the surface treated zinc oxide particles.
    Type: Application
    Filed: September 30, 2008
    Publication date: November 11, 2010
    Inventors: Kayo YABUKI, Atsushi TOFUKU
  • Publication number: 20090116100
    Abstract: To improve an optical property of a near-infrared-absorbing PDP filter and suppress a manufacturing cost. The present invention provides a dispersion liquid for near-infrared-absorbing adhesive-body. The dispersion liquid includes, in a solvent, one or more types of nanoparticles selected from a tungsten oxide nanoparticle and a composite tungsten oxide nanoparticle, and an acryl-based polymer dispersant is added to the dispersion liquid. The average dispersed nanoparticle diameter of the tungsten oxide nanoparticles and the composite tungsten oxide nanoparticles is equal to or smaller than 800 nm.
    Type: Application
    Filed: November 4, 2008
    Publication date: May 7, 2009
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Yosuke Ota, Atsushi Tofuku
  • Patent number: 7135223
    Abstract: A transparent conductive layered structure which has the functions of preventing electrostatic charging or shielding an electric field, and preventing reflection, the two-layered film of which has an excellent scratch strength, and with which a reduction in production cost is expected and a method of producing the same, and a transparent coat layer forming coating liquid used in the method of producing the same, and a display device to which the transparent conductive layered structure is applied, are provided.
    Type: Grant
    Filed: October 29, 2003
    Date of Patent: November 14, 2006
    Assignee: Sumitomo Metal Mining Co., Ltd.
    Inventors: Atsushi Tofuku, Masaya Yukinobu
  • Publication number: 20040091731
    Abstract: A transparent conductive layered structure which has the functions of preventing electrostatic charging or shielding an electric field, and preventing reflection, the two-layered film of which has an excellent scratch strength, and with which a reduction in production cost is expected and a method of producing the same, and a transparent coat layer forming coating liquid used in the method of producing the same, and a display device to which the transparent conductive layered structure is applied, are provided.
    Type: Application
    Filed: October 29, 2003
    Publication date: May 13, 2004
    Applicant: Sumitomo Metal Mining Co., Ltd.
    Inventors: Atsushi Tofuku, Masaya Yukinobu
  • Patent number: 6716480
    Abstract: The present invention relates to a transparent conductive layered structure which comprises a transparent substrate, a transparent conductive layer and a transparent coating layer formed successively in this order on the substrate, and is used in, for instance, the front panel of displays such as CRT, etc. The transparent conductive layered structure according to the invention is characterized in that the main components of the above-mentioned transparent conductive layer are gold microparticles or gold-containing noble metal microparticles containing 5 wt % or more of gold with a mean particle diameter of 1 to 100 nm, and a binder matrix comprising at least one functional group selected from mercapto groups (—SH), sulfide groups (—S), and polysulfide groups (—Sx, X≧2). Film strength and weather resistance of the transparent conductive layer are improved because the noble metal microparticles and a binder matrix are firmly bonded via the above-mentioned functional groups.
    Type: Grant
    Filed: December 27, 2002
    Date of Patent: April 6, 2004
    Assignee: Sumitomo Metal Mining Co., Ltd.
    Inventors: Masaya Yukinobu, Atsushi Tofuku, Kenji Kato, Midori Fujisaki
  • Patent number: 6673142
    Abstract: A transparent conductive layered structure which has the functions of preventing electrostatic charging or shielding an electric field, and preventing reflection, the two-layered film of which has an excellent scratch strength, and with which a reduction in production cost is expected and a method of producing the same, and a transparent coat layer forming coating liquid used in the method of producing the same, and a display device to which the transparent conductive layered structure is applied, are provided.
    Type: Grant
    Filed: July 24, 2001
    Date of Patent: January 6, 2004
    Assignee: Sumitomo Metal Mining Co., Ltd.
    Inventors: Atsushi Tofuku, Masaya Yukinobu
  • Publication number: 20030170448
    Abstract: The present invention relates to a transparent conductive layered structure which comprises a transparent substrate, a transparent conductive layer and a transparent coating layer formed successively in this order on the substrate, and is used in, for instance, the front panel of displays such as CRT, etc. The transparent conductive layered structure according to the invention is characterized in that the main components of the above-mentioned transparent conductive layer are gold microparticles or gold-containing noble metal microparticles containing 5 wt % or more of gold with a mean particle diameter of 1 to 100 nm, and a binder matrix comprising at least one functional group selected from mercapto groups (—SH), sulfide groups (—S), and polysulfide groups (—Sx, X≧2). Film strength and weather resistance of the transparent conductive layer are improved because the noble metal microparticles and a binder matrix are firmly bonded via the above-mentioned functional groups.
    Type: Application
    Filed: December 30, 2002
    Publication date: September 11, 2003
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Masaya Yukinobu, Atsushi Tofuku, Kenji Kato, Midori Fujisaki
  • Publication number: 20030165616
    Abstract: The present invention relates to a transparent conductive layered structure which comprises a transparent substrate, a transparent conductive layer and a transparent coating layer formed successively in this order on the substrate, and is used in, for instance, the front panel of displays such as CRT, etc. The transparent conductive layered structure according to the invention is characterized in that the main components of the above-mentioned transparent conductive layer are gold microparticles or gold-containing noble metal microparticles containing 5 wt % or more of gold with a mean particle diameter of 1 to 100 nm, and a binder matrix comprising at least one functional group selected from mercapto groups (—SH), sulfide groups (—S), and polysulfide groups (—Sx, X≧2). Film strength and weather resistance of the transparent conductive layer are improved because the noble metal microparticles and a binder matrix are firmly bonded via the above-mentioned functional groups.
    Type: Application
    Filed: December 27, 2002
    Publication date: September 4, 2003
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Masaya Yukinobu, Atsushi Tofuku, Kenji Kato, Midori Fujisaki
  • Patent number: 6569359
    Abstract: The object is to provide a transparent conductive layer forming coating liquid capable of forming a transparent conductive layer having such characteristics as high transmittance, low resistance, low reflectance and high strength and with few film defects. The transparent conductive layer forming coating liquid of the present invention is characterized in that it comprises, as its main components, a solvent and noble metal microparticles with a mean particle diameter of 1 to 100 nm dispersed in the solvent, and that the above-mentioned solvent comprises 0.005 to 1.0 wt % of formamide (HCONH2). Further, using this transparent conductive layer forming coating liquid, it is possible to form a conductive layer with developed meshy structures easily so that it can form transparent conductive layers having such characteristics as high transmittance, low resistance, low reflectance and high strength and with few film defects.
    Type: Grant
    Filed: July 24, 2001
    Date of Patent: May 27, 2003
    Assignee: Sumitomo Metal Mining Co., Ltd.
    Inventors: Masaya Yukinobu, Kennichi Fujita, Atsushi Tofuku, Kenji Kato