Patents by Inventor Miyuki Yabuki
Miyuki Yabuki 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: 20130316129Abstract: A silicon carbide material according to the present invention includes a substrate containing, as a main component, silicon carbide or containing, as main components, silicon carbide and metallic silicon, and a film covering at least a portion of the surface of the substrate. The film contains, as a main component, a phase including at least four elements: lithium (Li), aluminum (Al), silicon (Si), and oxygen (O). One example of such a silicon carbide material includes a substrate having a structure in which silicon carbide particles are bonded by metallic silicon, and a lithium aluminosilicate film covering at least a portion of the surface of the silicon carbide particles. Such a silicon carbide material can be used for a DPF, an electric heating type catalytic converter, or the like.Type: ApplicationFiled: July 31, 2013Publication date: November 28, 2013Applicant: NGK Insulators, Ltd.Inventors: Miyuki YABUKI, Takahiro TOMITA, Yoshimasa KOBAYASHI
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Patent number: 8307992Abstract: A liquid separation membrane installation body includes a porous base material, and a liquid separation membrane provided on the porous base material, the liquid separation membrane is a porous membrane formed of a dispersant layered inorganic compound, and a membrane thickness of the liquid separation membrane is 0.1 to 1.5 ?m. The liquid separation membrane is preferably formed of a sheet-like dispersant layered inorganic compound which has a thickness of 0.1 to 100 nm, a major diameter of 0.01 to 5 ?m and an aspect ratio (the major diameter/the thickness) of 3 or more and which is formed into the membrane on the porous base material. There is disclosed the liquid separation membrane installation body capable of increasing a permeation flow rate of a liquid.Type: GrantFiled: March 6, 2008Date of Patent: November 13, 2012Assignee: NGK Insulators, Ltd.Inventors: Kenichi Noda, Makiko Niino, Miyuki Yabuki
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Patent number: 7973090Abstract: A process for producing a zeolite membrane comprising a seed crystal forming step of placing, in a pressure-resistant vessel, a seeding sol containing silica, water and a structure-directing agent and a support in a state that the support is immersed in the seeding sol and heating the heat-resistant vessel to form a zeolite seed crystal on the surface of the support, and a membrane formation step of allowing the zeolite seed crystal to grow to form a zeolite membrane on the surface of the support. In the seed crystal forming step, the molar ratio of water/silica in the seeding sol is set 10 to 50 and the heating of the pressure-resistant vessel is conducted at 90 to 130° C. The crystal c-axis of the present zeolite membrane is oriented in a direction vertical to the surface of the support and its thickness is uniform.Type: GrantFiled: May 12, 2008Date of Patent: July 5, 2011Assignee: NGK Insulators, Ltd.Inventors: Kenji Suzuki, Shinji Nakamura, Miyuki Yabuki, Toshihiro Tomita
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Patent number: 7891499Abstract: A carbon membrane laminated body includes: a porous substrate, a first porous carbon membrane as a carbon membrane underlayer disposed on a surface of the porous substrate, and a second porous carbon membrane as a carbon membrane separation layer disposed on a surface of the carbon membrane underlayer, having a smaller film thickness, and a smaller average pore diameter, compared with those of the carbon membrane underlayer. It is preferable to form the carbon membrane underlayer and the carbon membrane separation layer by carbonizing a carbon membrane underlayer precursor disposed on a surface of the porous substrate and the carbon membrane separation layer precursor disposed on a surface of the carbon membrane underlayer precursor at 400 to 1000° C. in a non-oxidation atmosphere. The carbon membrane laminated body is a separation membrane excellent in both separation performance and flux when it is used as a separation membrane of a mixture.Type: GrantFiled: May 26, 2009Date of Patent: February 22, 2011Assignee: NGK Insulators, Ltd.Inventors: Akimasa Ichikawa, Miyuki Yabuki
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Publication number: 20090242478Abstract: A carbon membrane laminated body includes: a porous substrate, a first porous carbon membrane as a carbon membrane underlayer disposed on a surface of the porous substrate, and a second porous carbon membrane as a carbon membrane separation layer disposed on a surface of the carbon membrane underlayer, having a smaller film thickness, and a smaller average pore diameter, compared with those of the carbon membrane underlayer. It is preferable to form the carbon membrane underlayer and the carbon membrane separation layer by carbonizing a carbon membrane underlayer precursor disposed on a surface of the porous substrate and the carbon membrane separation layer precursor disposed on a surface of the carbon membrane underlayer precursor at 400 to 1000° C. in a non-oxidation atmosphere. The carbon membrane laminated body is a separation membrane excellent in both separation performance and flux when it is used as a separation membrane of a mixture.Type: ApplicationFiled: May 26, 2009Publication date: October 1, 2009Applicant: NGK Insulators, Ltd.Inventors: Akimasa Ichikawa, Miyuki Yabuki
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Patent number: 7442367Abstract: The present invention discloses a production method for a zeolite shaped body in which a tetrapropylammonium hydroxide (TPAOH) solution and tetrapropylammonium bromide (TPABr) are added to a silica sol, an obtained prepared solution is heated under a condition that crystallization and/or precipitation does not occur in the prepared solution in a sealed vessel, the heated prepared solution is dried, an obtained dry gel is shaped, and the shaped dry gel is subjected to crystallization treatment in steam, and it is possible to efficiently produce a zeolite shaped body on which a zeolite membrane can be formed and maintained without generating any crack, and which satisfies both reduction of pressure loss and maintenance or improvement of mechanical strength, when used as a gas separation membrane such as a molecular sieve membrane or a pervaporation membrane.Type: GrantFiled: February 7, 2005Date of Patent: October 28, 2008Assignee: NGK Insulators, Ltd.Inventors: Miyuki Yabuki, Kenji Suzuki, Shinji Nakamura, Toshihiro Tomita
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Publication number: 20080217240Abstract: An oriented zeolite membrane-provided structure comprising a support and a membrane-like, MFI type zeolite crystal (an oriented zeolite membrane) provided on the surface of the support, wherein, in the zeolite crystal, the proportion of zeolite crystals whose c-axes are oriented at an angle of 90°±33.76° relative to the surface of the support, is 90% or more of the whole zeolite crystals and the oriented zeolite membrane has a thickness of 1 to 30 ?m. The present invention provides an oriented zeolite membrane-provided structure comprising a support and an oriented zeolite membrane provided thereon, wherein the c-axes of zeolite crystals of the membrane are oriented in a direction vertical to the surface of the support and the thickness of the membrane is small.Type: ApplicationFiled: May 12, 2008Publication date: September 11, 2008Applicant: NGK Insulators, Ltd.Inventors: Miyuki Yabuki, Kenji Suzuki, Shinji Nakamura, Toshihiro Tomita
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Publication number: 20080214686Abstract: A process for producing a zeolite membrane comprising a seed crystal forming step of placing, in a pressure-resistant vessel, a seeding sol containing silica, water and a structure-directing agent and a support in a state that the support is immersed in the seeding sol and heating the heat-resistant vessel to form a zeolite seed crystal on the surface of the support, and a membrane formation step of allowing the zeolite seed crystal to grow to form a zeolite membrane on the surface of the support. In the seed crystal forming step, the molar ratio of water/silica in the seeding sol is set 10 to 50 and the heating of the pressure-resistant vessel is conducted at 90 to 130° C. The crystal c-axis of the present zeolite membrane is oriented in a direction vertical to the surface of the support and its thickness is uniform.Type: ApplicationFiled: May 12, 2008Publication date: September 4, 2008Applicant: NGK Insulators, Ltd.Inventors: Kenji SUZUKI, Shinji NAKAMURA, Miyuki YABUKI, Toshihiro TOMITA
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Publication number: 20080156721Abstract: A liquid separation membrane installation body includes a porous base material, and a liquid separation membrane provided on the porous base material, the liquid separation membrane is a porous membrane formed of a dispersant layered inorganic compound, and a membrane thickness of the liquid separation membrane is 0.1 to 1.5 ?m. The liquid separation membrane is preferably formed of a sheet-like dispersant layered inorganic compound which has a thickness of 0.1 to 100 nm, a major diameter of 0.01 to 5 ?m and an aspect ratio (the major diameter/the thickness) of 3 or more and which is formed into the membrane on the porous base material. There is disclosed the liquid separation membrane installation body capable of increasing a permeation flow rate of a liquid.Type: ApplicationFiled: March 6, 2008Publication date: July 3, 2008Applicant: NGK Insulators, Ltd.Inventors: Kenichi Noda, Makiko Niino, Miyuki Yabuki
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Publication number: 20050148457Abstract: The present invention discloses a production method for a zeolite shaped body in which a tetrapropylammonium hydroxide (TPAOH) solution and tetrapropylammonium bromide (TPABr) are added to a silica sol, an obtained prepared solution is heated under a condition that crystallization and/or precipitation does not occur in the prepared solution in a sealed vessel, the heated prepared solution is dried, an obtained dry gel is shaped, and the shaped dry gel is subjected to crystallization treatment in steam, and it is possible to efficiently produce a zeolite shaped body on which a zeolite membrane can be formed and maintained without generating any crack, and which satisfies both reduction of pressure loss and maintenance or improvement of mechanical strength, when used as a gas separation membrane such as a molecular sieve membrane or a pervaporation membrane.Type: ApplicationFiled: February 7, 2005Publication date: July 7, 2005Applicant: NGK Insulators, Ltd.Inventors: Miyuki Yabuki, Kenji Suzuki, Shinji Nakamura, Toshihiro Tomita