Patents by Inventor Takashi Wano
Takashi Wano 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: 20150203646Abstract: The method for producing the porous sheet of the present invention includes the steps of (I) preparing a plurality of sheet materials that contain polytetrafluoroethylene and carbon particles and (II) stacking the plurality of sheet materials over one another and rolling the stacked sheet materials. In the method for producing the porous sheet of the present invention, step (I) and step (II) may be repeated alternately. Further, as the sheet materials to be used in the production method of the present invention, a base sheet obtained by forming a mixture containing polytetrafluoroethylene and carbon particles into sheet form also can be used, or a laminated sheet obtained by stacking a plurality of base sheets over one another and rolling them also can be used, for example.Type: ApplicationFiled: March 25, 2015Publication date: July 23, 2015Inventors: Takashi WANO, Hiroyuki HIGUCHI, Masayoshi KAWABE, Ryoichi MATSUSHIMA, Yoshinori YAMAMOTO, Koichiro YAMASHITA
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Patent number: 9023546Abstract: There is disclosed a fuel cell in which an insulating material is disposed, whereby the thermal diffusion of the inside and outside of a fuel cell can be suppressed to suppress the deterioration of the performance of the fuel cell due to a temperature drop. Moreover, the physical properties of the insulating material are specified, whereby appropriate insulating properties required in the fuel cell can be obtained, and startup properties are improved. A fuel cell has a cell stack in which a plurality of unit cells are stacked, and terminal plates disposed on both sides of the cell stack in a cell stack direction thereof. The fuel cell comprises an insulating portion having an insulating material and holding plates which hold the insulating material from both the sides of the insulating material in the cell stack direction, the insulating material is held between the holding plates, and the insulating material has a thermal conductivity of 0.1 W/mK or less and a porosity of 70% or more.Type: GrantFiled: October 17, 2008Date of Patent: May 5, 2015Assignees: Toyota Jidosha Kabushiki Kaisha, Nitto Denko CorporationInventors: Yoshinori Yamamoto, Koichiro Yamashita, Takashi Wano, Ryoichi Matsushima
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Patent number: 9017817Abstract: The method for producing the porous sheet of the present invention includes the steps of (I) preparing a plurality of sheet materials that contain polytetrafluoroethylene and carbon particles and (II) stacking the plurality of sheet materials over one another and rolling the stacked sheet materials. In the method for producing the porous sheet of the present invention, step (I) and step (II) may be repeated alternately. Further, as the sheet materials to be used in the production method of the present invention, a base sheet obtained by forming a mixture containing polytetrafluoroethylene and carbon particles into sheet form also can be used, or a laminated sheet obtained by stacking a plurality of base sheets over one another and rolling them also can be used, for example.Type: GrantFiled: April 28, 2009Date of Patent: April 28, 2015Assignee: Nitto Denko CorporationInventors: Takashi Wano, Hiroyuki Higuchi, Masayoshi Kawabe, Ryoichi Matsushima, Yoshinori Yamamoto, Koichiro Yamashita
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Patent number: 8945453Abstract: The present invention provides a method for producing a PTFE fiber that makes it possible, unlike the emulsion spinning process, to obtain a polytetrafluoroethylene (PTFE) fiber, particularly a long PTFE fiber, without using a matrix material, is more productive than conventional production methods such as a slit yarn process, and is capable of enhancing mechanical properties and the degree of freedom in diameter of the obtained fiber. The method for producing the PTFE fiber of the present invention includes the step of reducing a diameter of a string-shape PTFE-containing solid material (a first solid material) by drawing the first solid material at a temperature equal to or higher than a melting point of PTFE. The first solid material can be obtained from a PTFE-containing solid material (a second solid material) containing water and a surfactant, by reducing an amount of the water contained in the second solid material.Type: GrantFiled: June 16, 2008Date of Patent: February 3, 2015Assignees: Nitto Denko Corporation, National University Corporation Kyoto Institute of TechnologyInventors: Daisuke Kitagawa, Takashi Wano, Hideki Yamane, Yoshihito Takagi
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Patent number: 8643531Abstract: An electromagnetic wave absorber includes a dielectric layer, a divided conductive film layer and an electromagnetic wave reflective layer, wherein a ratio of thickness ‘d’ and wavelength ‘?’ satisfies a condition of [0.01?d/?0.03], weight per unit area of the electromagnetic wave absorber falls within a range of 1000 g/m2 and 3000 g/m2. The divided conductive film layer is configured such that each side's length of conductive films is dimensioned within a range of 0.5 mm and 4.8 mm and arrangement distance between adjoining conductive films is taken within a range of 0.01 mm and 3 mm.Type: GrantFiled: April 25, 2011Date of Patent: February 4, 2014Assignee: Nitto Denko CorporationInventors: Yuuki Fukuda, Takashi Wano, Masataka Tada, Osamu Hashimoto
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Publication number: 20130306364Abstract: Disclosed is an electromagnetic wave shielding sheet for use in wireless power transmission which suppresses electromagnetic wave leakage in a broad range and which is easily adaptable to various types of wireless power transmitters. The disclosed electromagnetic wave shielding sheet is used in a wireless transmitter and has a multilayer structure including at least one metal layer and at least one magnetic material layer.Type: ApplicationFiled: May 16, 2011Publication date: November 21, 2013Applicant: NITTO DENKO CORPORATIONInventors: Hidenori Suzuki, Takashi Wano, Masataka Tada, Yuuki Fukuda
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Publication number: 20130120959Abstract: The dielectric sheet of the present invention is made of a sheet having a thickness of 5-30 ?m, which is formed by drying a coated film of a coating liquid containing a resin and a natural graphite powder having an average particle diameter of 10 ?m or less. Preferably, the sheet is formed from a coating liquid containing a resin, a natural graphite powder having an average particle diameter of 10 ?m or less, and a solvent, wherein the content rate of the natural graphite powder to the resin exceeds 5% by volume and is not more than 20% by volume, and the total content of the resin and the natural graphite powder is 10-55 wt %.Type: ApplicationFiled: May 27, 2011Publication date: May 16, 2013Applicant: NITTO DENKO CORPORATIONInventors: Takashi Wano, Masataka Tada, Yuuki Fukuda, Osamu Hashimoto, Ryoji Tamaru
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Patent number: 8440127Abstract: Disclosed is a process for production of a polytetrafluoroethylene (PTFE) sheet, which is superior in productivity compared to conventional processes and can reduce the cost of production. Also disclosed is a process for production of a PTFE seal tape. The processes comprise the following steps (i) to (iii): (i) applying a force to a PTFE particle suspension comprising PTFE particles, a surfactant and water (a dispersion medium) so that the particles can come close to each other or contact with each other, thereby forming a PTFE-containing solid material having the water and the surfactant included therein; (ii) shaping the solid material into a sheet-like form; and (iii) reducing the water content in the sheet-like solid material.Type: GrantFiled: August 16, 2012Date of Patent: May 14, 2013Assignee: Nitto Denko CorporationInventors: Takashi Wano, Yozo Nagai, Yuri Horie, Atsushi Tanaka, Osamu Tabei
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Publication number: 20120309879Abstract: Provided is a method for producing a thermally-conductive adhesive sheet including a thermally-conductive adhesive agent layer by performing: a composition preparation step of preparing a thermally-conductive adhesive agent composition including a thermally-conductive particle and an acrylic polymer component; and an adhesive agent layer formation step of forming a sheet-shaped thermally-conductive adhesive agent layer with the thermally-conductive adhesive agent composition, wherein in the composition preparation step, a cyclic organic compound of 8 or less carbon atoms, or an organic compound of 3 or less carbon atoms having a hydroxy, ketone, aldehyde, carboxyl or nitrile group is mixed as a constitutional component of the thermally-conductive adhesive agent composition.Type: ApplicationFiled: January 27, 2011Publication date: December 6, 2012Applicant: NITTO DENKO CORPORATIONInventors: Kenji Furuta, Junichi Nakayama, Yoshio Terada, Takashi Wano
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Publication number: 20120306115Abstract: Disclosed is a process for production of a polytetrafluoroethylene (PTFE) sheet, which is superior in productivity compared to conventional processes and can reduce the cost of production. Also disclosed is a process for production of a PTFE seal tape. The processes comprise the following steps (i) to (iii): (i) applying a force to a PTFE particle suspension comprising PTFE particles, a surfactant and water (a dispersion medium) so that the particles can come close to each other or contact with each other, thereby forming a PTFE-containing solid material having the water and the surfactant included therein; (ii) shaping the solid material into a sheet-like form; and (iii) reducing the water content in the sheet-like solid material.Type: ApplicationFiled: August 16, 2012Publication date: December 6, 2012Applicant: NITTO DENKO CORPORATIONInventors: Takashi WANO, Yozo NAGAI, Yuri HORIE, Atsushi TANAKA, Osamu TABEI
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Patent number: 8268221Abstract: Disclosed is a process for production of a polytetrafluoroethylene (PTFE) sheet, which is superior in productivity compared to conventional processes and can reduce the cost of production. Also disclosed is a process for production of a PTFE seal tape. The processes comprise the following steps (i) to (iii): (i) applying a force to a PTFE particle suspension comprising PTFE particles, a surfactant and water (a dispersion medium) so that the particles can come close to each other or contact with each other, thereby forming a PTFE-containing solid material having the water and the surfactant included therein; (ii) shaping the solid material into a sheet-like form; and (iii) reducing the water content in the sheet-like solid material.Type: GrantFiled: April 27, 2007Date of Patent: September 18, 2012Assignee: Nitto Denko CorporationInventors: Takashi Wano, Yozo Nagai, Yuri Horie, Atsushi Tanaka, Osamu Tabei
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Patent number: 8226864Abstract: The present invention provides a method of manufacturing a polytetrafluoroethylene (PTFE) product offering better productivity and a higher degree of flexibility in form of the product to be obtained than the conventional methods of manufacturing a PTFE product, and a method of manufacturing PTFE particle aggregate obtained as an intermediate while manufacturing a PTFE product. According to the manufacturing methods, aggregate of PTFE particles including water and a surfactant is obtained by applying force to a dispersion of PTFE particles containing PTFE particles, a surfactant and water as a dispersion medium, where the force makes the PTFE particles approach or contact with each other. Such a manufacturing method may be carried out, for example, with a chamber (1) shown in FIG. 1.Type: GrantFiled: December 23, 2011Date of Patent: July 24, 2012Assignee: Nitto Denko CorporationInventors: Takashi Wano, Yuri Horie, Atsushi Tanaka, Osamu Tabei, Yozo Nagai
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Publication number: 20120101215Abstract: The present invention provides a method of manufacturing a polytetrafluoroethylene (PTFE) product offering better productivity and a higher degree of flexibility in form of the product to be obtained than the conventional methods of manufacturing a PTFE product, and a method of manufacturing PTFE particle aggregate obtained as an intermediate while manufacturing a PTFE product. According to the manufacturing methods, aggregate of PTFE particles including water and a surfactant is obtained by applying force to a dispersion of PTFE particles containing PTFE particles, a surfactant and water as a dispersion medium, where the force makes the PTFE particles approach or contact with each other. Such a manufacturing method may be carried out, for example, with a chamber (1) shown in FIG. 1.Type: ApplicationFiled: December 23, 2011Publication date: April 26, 2012Applicant: NITTO DENKO CORPORATIONInventors: Takashi WANO, Yuri HORIE, Atsushi TANAKA, Osamu TABEI, Yozo NAGAI
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Patent number: 8105515Abstract: The present invention provides a method of manufacturing a polytetrafluoroethylene (PTFE) product offering better productivity and a higher degree of flexibility in form of the product to be obtained than the conventional methods of manufacturing a PTFE product, and a method of manufacturing PTFE particle aggregate obtained as an intermediate while manufacturing a PTFE product. According to the manufacturing methods, aggregate of PTFE particles including water and a surfactant is obtained by applying force to a dispersion of PTFE particles containing PTFE particles, a surfactant and water as a dispersion medium, where the force makes the PTFE particles approach or contact with each other. Such a manufacturing method may be carried out, for example, with a chamber (1) shown in FIG. 1.Type: GrantFiled: May 1, 2006Date of Patent: January 31, 2012Assignee: Nitto Denko CorporationInventors: Takashi Wano, Yuri Hori, Atsushi Tanaka, Osamu Tabei, Yozo Nagai
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Publication number: 20110290468Abstract: An object is to provide a heat conductive adhesive composition containing boron nitride particles and an acrylic polymer, which is capable of forming a molding having a good heat conductivity, and a heat conductive adhesive sheet with the heat conductive adhesive composition therein, which has a good heat conductivity and bond strength. Provided is the heat conductive adhesive composition which contains boron nitride particles and an acrylic polymer component, and the above boron nitride particles contain boron nitride particles having a particle size of 3 ?m or more and 300 ?m or less, wherein the boron nitride particles contain 5 to 45% by volume of boron nitride particles having a particle size of 3 ?m or more and 20 ?m or less, 30 to 70% by volume of boron nitride particles having a particle size of more than 20 ?m and 60 ?m or less, 1.0 to 40% by volume of boron nitride particles having a particle size of more than 60 ?m and 300 ?m or less.Type: ApplicationFiled: January 13, 2010Publication date: December 1, 2011Applicant: NITTO DENKO CORPORATIONInventors: Junichi Nakayama, Yoshio Terada, Kenji Furuta, Takashi Wano
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Publication number: 20110260904Abstract: An electromagnetic wave absorber includes a dielectric layer, a divided conductive film layer and an electromagnetic wave reflective layer, wherein a ratio of thickness ‘d’ and wavelength ‘?’ satisfies a condition of [0.01?d/?0.03], weight per unit area of the electromagnetic wave absorber falls within a range of 1000 g/m2 and 3000 g/m2. The divided conductive film layer is configured such that each side's length of conductive films is dimensioned within a range of 0.5 mm and 4.8 mm and arrangement distance between adjoining conductive films is taken within a range of 0.01 mm and 3 mm.Type: ApplicationFiled: April 25, 2011Publication date: October 27, 2011Applicant: NITTO DENKO CORPORATIONInventors: Yuuki Fukuda, Takashi Wano, Masataka Tada, Osamu Hashimoto
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Publication number: 20110223427Abstract: The method of producing an electrically insulating thermally conductive sheet of the present invention includes the steps of (I) preparing a plurality of sheet materials consisting essentially of a fluororesin containing polytetrafluoroethylene, thermally conductive inorganic particles, and a forming aid; (II) stacking the plurality of sheet materials on one another and rolling the stacked sheet materials together; and (III) removing the forming aid. In the production method of the present invention, the step (I) and the step (II) may be repeated alternately. The sheet material that can be used in the production method of the present invention is, for example, a base sheet obtained by forming a mixture composed of a fluororesin containing polytetrafluoroethylene, thermally conductive inorganic particles, and a forming aid into a sheet, or a laminated sheet obtained by stacking a plurality of base sheets on one another and rolling them together.Type: ApplicationFiled: November 12, 2009Publication date: September 15, 2011Applicant: NITTO DENKO CORPORATIONInventors: Takashi Wano, Daisuke Kitagawa, Yoshinari Takayama
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Publication number: 20110039091Abstract: The method for producing the porous sheet of the present invention includes the steps of (I) preparing a plurality of sheet materials that contain polytetrafluoroethylene and carbon particles and (II) stacking the plurality of sheet materials over one another and rolling the stacked sheet materials. In the method for producing the porous sheet of the present invention, step (I) and step (II) may be repeated alternately. Further, as the sheet materials to be used in the production method of the present invention, a base sheet obtained by forming a mixture containing polytetrafluoroethylene and carbon particles into sheet form also can be used, or a laminated sheet obtained by stacking a plurality of base sheets over one another and rolling them also can be used, for example.Type: ApplicationFiled: April 28, 2009Publication date: February 17, 2011Applicants: NITTO DENKO CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takashi Wano, Hiroyuki Higuchi, Masayoshi Kawabe, Ryoichi Matsushima, Yoshinori Yamamoto, Koichiro Yamashita
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Publication number: 20100273083Abstract: There is disclosed a fuel cell in which an insulating material is disposed, whereby the thermal diffusion of the inside and outside of a fuel cell can be suppressed to suppress the deterioration of the performance of the fuel cell due to a temperature drop. Moreover, the physical properties of the insulating material are specified, whereby appropriate insulating properties required in the fuel cell can be obtained, and startup properties are improved. A fuel cell has a cell stack in which a plurality of unit cells are stacked, and terminal plates disposed on both sides of the cell stack in a cell stack direction thereof. The fuel cell comprises an insulating portion having an insulating material and holding plates which hold the insulating material from both the sides of the insulating material in the cell stack direction, the insulating material is held between the holding plates, and the insulating material has a thermal conductivity of 0.1 W/mK or less and a porosity of 70% or more.Type: ApplicationFiled: October 17, 2008Publication date: October 28, 2010Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, NITTO DENKO CORPORATIONInventors: Yoshinori Yamamoto, Koichiro Yamashita, Takashi Wano, Ryoichi Matsushima
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Publication number: 20100203332Abstract: The present invention provides a method for producing a PTFE fiber that makes it possible, unlike the emulsion spinning process, to obtain a polytetrafluoroethylene (PTFE) fiber, particularly a long PTFE fiber, without using a matrix material, is more productive than conventional production methods such as a slit yarn process, and is capable of enhancing mechanical properties and the degree of freedom in diameter of the obtained fiber. The method for producing the PTFE fiber of the present invention includes the step of reducing a diameter of a string-shape PTFE-containing solid material (a first solid material) by drawing the first solid material at a temperature equal to or higher than a melting point of PTFE. The first solid material can be obtained from a PTFE-containing solid material (a second solid material) containing water and a surfactant, by reducing an amount of the water contained in the second solid material.Type: ApplicationFiled: June 16, 2008Publication date: August 12, 2010Applicants: Nitto Denko Corporation, National University Corporation Kyoto Institute of TechnologyInventors: Daisuke Kitagawa, Takashi Wano, Hideki Yamane, Yoshihito Takagi