Patents by Inventor Yoshiaki Hirose
Yoshiaki Hirose 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: 20200190383Abstract: An expanded-graphite sheet whose thermal conductivity in its surfacewise directions is relatively uniform and higher than its thermal conductivity in its perpendicular direction can be produced efficiently at relatively low cost. Because the expanded-graphite sheet is made of expanded graphite alone and has thermal conductivity in parallel direction of 350 W/(m·K) or more, its thermal conductivity in parallel direction is much higher than its thermal conductivity in a perpendicular direction; therefore, it is suitable for the conduction and diffusion of heat. Besides, the expanded-graphite sheet can be produced easily, in a short time, efficiently, at relatively low cost.Type: ApplicationFiled: December 9, 2019Publication date: June 18, 2020Inventor: Yoshiaki Hirose
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Patent number: 10538691Abstract: An expanded-graphite sheet whose thermal conductivity in its surfacewise directions is relatively uniform and higher than its thermal conductivity in its perpendicular direction can be produced efficiently at relatively low cost. Because the expanded-graphite sheet is made of expanded graphite alone and has thermal conductivity in parallel direction of 350 W/(m·K) or more, its thermal conductivity in parallel direction is much higher than its thermal conductivity in a perpendicular direction; therefore, it is suitable for the conduction and diffusion of heat. Besides, the expanded-graphite sheet can be produced easily, in a short time, efficiently, at relatively low cost.Type: GrantFiled: January 6, 2017Date of Patent: January 21, 2020Assignee: Toyo Tanso Co., Ltd.Inventor: Yoshiaki Hirose
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Publication number: 20170174519Abstract: An expanded-graphite sheet whose thermal conductivity in its surfacewise directions is relatively uniform and higher than its thermal conductivity in its perpendicular direction can be produced efficiently at relatively low cost. Because the expanded-graphite sheet is made of expanded graphite alone and has thermal conductivity in parallel direction of 350 W/(m·K) or more, its thermal conductivity in parallel direction is much higher than its thermal conductivity in a perpendicular direction; therefore, it is suitable for the conduction and diffusion of heat. Besides, the expanded-graphite sheet can be produced easily, in a short time, efficiently, at relatively low cost.Type: ApplicationFiled: January 6, 2017Publication date: June 22, 2017Inventor: Yoshiaki Hirose
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Patent number: 9556033Abstract: An expanded graphite sheet is provided that can remarkably improve the quality and yield rate by preventing chipping and cracks in the surface in molding the sheet into a desired shape by inhibiting degradation in the flexibility while reducing the ash content to a certain degree. An expanded graphite sheet (3) has a flexibility of 25 times or greater, as determined in a flexibility test in which the flexibility is defined as the number of times the expanded graphite sheet (3) can be bent using a flexibility testing device having a rotator (2) to which one end of a plate-shaped expanded graphite sheet (3) is fixed, a weight (7) fixed to the other end of the expanded graphite sheet (3), and a bending position determining member (5) for determining a bending position of the expanded graphite sheet (3) when the rotator (2) is rotated.Type: GrantFiled: October 17, 2011Date of Patent: January 31, 2017Assignee: TOYO TANSO CO., LTD.Inventors: Tetsuya Yuki, Yoshiaki Hirose
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Patent number: 8864908Abstract: A crucible protection sheet is provided that can prevent damages to an inner crucible, hinder an outer crucible from silicon-carbidization, and transmit heat from the outer crucible to the inner crucible uniformly. In a crucible having an inner crucible 2 and an outer crucible 3, the crucible protection sheet is arranged between the two crucibles and is made of expanded graphite. The planar thermal conductivity is 120 W/(m·K) or higher, the gas permeability is less than 1.0×10?4 cm2/s, and the compression ratio is 20% or higher when the sheet is compressed in a thickness direction at a pressure of 34.3 MPa. Since the compression ratio is high, the effect of preventing breakage is great when inserting the inner crucible, improving workability and preventing the inner crucible from tilting inside the outer crucible.Type: GrantFiled: July 9, 2007Date of Patent: October 21, 2014Assignee: Toyo Tanso Co., Ltd.Inventors: Yoshiaki Hirose, Tetsuya Yuki
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Patent number: 8765093Abstract: An object is to provide an expanded graphite sheet at the use stage that can prevent can prevent degradation in product quality and deterioration in product yield by inhibiting the expanded graphite sheet from containing impurities even when the expanded graphite sheet is actually used. An expanded graphite sheet at the use stage in a condition in which the expanded graphite sheet is packed with a packing material and thereafter removed from the packing material, characterized in that all of the amounts of Al, B, Be, Ca, Cu, Fe, Li, Mg, Ni, S, Ti, V, and Zn as determined by an ICP emission spectroscopy method, the amounts of K and Na as determined by an atomic absorption spectrometry method, and the amount of Si as determined by an absorption spectrophotometry method are at a level less than the detection limit.Type: GrantFiled: August 6, 2010Date of Patent: July 1, 2014Assignee: Toyo Tanso Co., Ltd.Inventors: Tetsuya Yuki, Yoshiaki Hirose
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Publication number: 20130305984Abstract: A graphite crucible (2) for retaining a quartz crucible (1) has a graphite crucible substrate (3) as a graphite crucible forming material, and a coating film (4) made of a carbonized phenolic resin and formed over the entire surface of the graphite crucible substrate (3). The phenolic resin is impregnated inside open pores (5) existing in a surface of the graphite crucible substrate (3). The coating film (4) may be formed only within a portion of the graphite crucible in which SiC formation can occur easily, not over the entirety of the surface of the graphite crucible. For example, it is possible to deposit the film only on the entire inner surface of the crucible. It is also possible to deposit the film only on a curved portion (sharply curved portion) of the inner surface, or only on a curved portion and a straight trunk portion.Type: ApplicationFiled: January 30, 2010Publication date: November 21, 2013Applicant: TOYO TANSO CO., LTD.Inventors: Osamu Okada, Yoshiaki Hirose, Tomomitsu Yokoi, Yasuhisa Ogita
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Publication number: 20130202872Abstract: An expanded graphite sheet is provided that can remarkably improve the quality and yield rate by preventing chipping and cracks in the surface in molding the sheet into a desired shape by inhibiting degradation in the flexibility while reducing the ash content to a certain degree. An expanded graphite sheet (3) has a flexibility of 25 times or greater, as determined in a flexibility test in which the flexibility is defined as the number of times the expanded graphite sheet (3) can be bent using a flexibility testing device having a rotator (2) to which one end of a plate-shaped expanded graphite sheet (3) is fixed, a weight (7) fixed to the other end of the expanded graphite sheet (3), and a bending position determining member (5) for determining a bending position of the expanded graphite sheet (3) when the rotator (2) is rotated.Type: ApplicationFiled: October 17, 2011Publication date: August 8, 2013Applicant: TOYO TANSO CO., LTD.Inventors: Tetsuya Yuki, Yoshiaki Hirose
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Publication number: 20130160703Abstract: A carbon crucible prevents leakage of SiO gas from a boundary portion between a straight trunk portion and a tray portion and prevents SiC formation from quickly developing. A carbon crucible (5) for retaining a quartz crucible (4) used in a metal single crystal pulling apparatus for silicon or the like has a straight trunk portion (9) and a tray portion (10) that are divided from each other. A graphite sheet (11) is disposed between the quartz crucible (4) and the carbon crucible (5) so as to cover at least a boundary portion (A) of an inner surface of the carbon crucible (5) between the straight trunk portion (9) and the tray portion (10). The graphite sheet (11) is an expanded graphite sheet.Type: ApplicationFiled: August 26, 2011Publication date: June 27, 2013Applicant: TOYO TANSO CO., LTD.Inventors: Osamu Okada, Yoshiaki Hirose, Tetsuya Yuki, Hiromitsu Sugawa
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Publication number: 20120107222Abstract: An object is to provide an expanded graphite sheet at the use stage that can prevent can prevent degradation in product quality and deterioration in product yield by inhibiting the expanded graphite sheet from containing impurities even when the expanded graphite sheet is actually used. An expanded graphite sheet at the use stage in a condition in which the expanded graphite sheet is packed with a packing material and thereafter removed from the packing material, characterized in that all of the amounts of Al, B, Be, Ca, Cu, Fe, Li, Mg, Ni, S, Ti, V, and Zn as determined by an ICP emission spectroscopy method, the amounts of K and Na as determined by an atomic absorption spectrometry method, and the amount of Si as determined by an absorption spectrophotometry method are at a level less than the detection limit.Type: ApplicationFiled: August 6, 2010Publication date: May 3, 2012Applicant: TOYO TANSO CO., LTD.Inventors: Tetsuya Yuki, Yoshiaki Hirose
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Patent number: 8097331Abstract: There is provided a mold release sheet (4) disposed between silica powder M and an inner face of an outer member 1b of a mold and made of expanded graphite. The mold release sheet has a gas permeability represented by the following equation (1) from 5.0×10?7 cm2/s to 1.0×10?4 cm2/s. Gas permeability=Q·L/(?P·A) (1). In this equation (1), Q is the gas flow rate (Pa·cm3/s), ?P is the pressure difference (Pa) between two chambers, A is the gas transmission area (cm2) of the mold release sheet, which is the area of a passage that allows the two chambers to communicate with each other, and L is the thickness (cm) of the mold release sheet.Type: GrantFiled: July 26, 2007Date of Patent: January 17, 2012Assignee: Toyo Tanso Co., Ltd.Inventors: Tetsuya Yuki, Yoshiaki Hirose
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Patent number: 8048527Abstract: A formed exfoliated graphite article which comprises an oxidation-resistant coating layer formed at least in the surface layer portion thereof, preferably wherein the oxidation-resistant coating layer contains a boron element and a phosphorus element, the content of a boron element in the oxidation-resistant coating layer is 1 mass % or more, the content of a phosphorus in the oxidation-resistant coating layer is 0.1 mass % or more, and the oxidation-resistant coating layer is formed in a thickness of 0.5 ?m or more.Type: GrantFiled: September 3, 2003Date of Patent: November 1, 2011Assignees: Toyo Tanso Co., Ltd., Oiles CorporationInventors: Yoshiaki Hirose, Takao Matsui
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Patent number: 7914894Abstract: The invention provides a flexible, highly pure expanded graphite sheet characterized by having an impurity content of 10 ppm or less and such a degree of flexibility that a sample thereof, 10×100 mm in size can withstand at least 10 times of bending in flexibility test comprising repeatedly bending the sample, with a 50-g weight suspended from one end thereof, by means of bending bodies with a diameter of 6 mm.Type: GrantFiled: May 9, 2005Date of Patent: March 29, 2011Assignee: Toyo Tanso Co., LtdInventors: Yoshiaki Hirose, Hideki Inomoto
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Publication number: 20100209755Abstract: A solar battery unit is provided that can release the heat of the solar battery module sufficiently and suppress the temperature increase of a solar battery module by inhibiting the presence of an air layer with a low thermal conductivity in a heat transfer passage, whereby the energy conversion efficiency can be improved remarkably. A solar battery unit has: a solar battery module; and a heat dissipating member, provided on a back surface of the solar battery module, for releasing heat from the solar battery module. A heat transfer sheet including expanded graphite is interposed between the solar battery module and the heat dissipating member, and the heat transfer sheet is attached in a compressed state to the solar battery module and the heat dissipating member.Type: ApplicationFiled: September 26, 2008Publication date: August 19, 2010Applicants: TOYO TANSO CO., LTD., INSTITUTE OF NATIONAL COLLEGES OF TECHNOLOGYInventors: Yoshiaki Hirose, Tetsuya Yuki, Yukinori Misaki, Hitomi Komiya
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Publication number: 20100157612Abstract: A circuit board using a heat radiating member that can cool an electronic component sufficiently without causing a substrate to break, increasing the total weight of the substrate, lowering the productivity, or increasing cost and device size. A circuit board has a substrate main body (4) having a wiring pattern (3) formed on a surface side, and a structure in which an LED module (1) is connected to the wiring pattern (3). The circuit board is characterized in that: a through hole (6) is provided in a portion of the substrate main body (4) so as to penetrate the substrate main body (4) from the surface side to a back side thereof; a heat radiating member (5) is provided on the back side of the substrate main body (4) so as to close one end of the through hole (6); and the LED module (1) is disposed in the through hole (6) so that the heat radiating member (5) and the LED module (1) are directly in contact with each other.Type: ApplicationFiled: March 11, 2009Publication date: June 24, 2010Applicants: TOYO TANSO CO., LTD., INSTITUTE OF NATIONAL COLLEGES OF TECHNOLOGY, JPInventors: Yoshiaki Hirose, Tetsuya Yuki, Yukinori Misaki, Masateru Arakawa
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Publication number: 20100116198Abstract: A method is provided of protecting a carbonaceous crucible that is easy to handle, reduces work hour, and can cover the inner surface of a crucible without breaking the sheet and without gaps. A single-crystal pulling apparatus is also provided. The method of protecting a carbonaceous crucible by interposing a protective sheet made of an expanded graphite material between a quartz crucible and a carbonaceous crucible on which the quartz crucible is placed, including: laying two or more protective sheet pieces on an inner surface of the carbonaceous crucible, each of the protective sheet pieces having such a shape that the protective sheet pieces are combined integrally to form the protective sheet in laying the protective sheet between the crucibles.Type: ApplicationFiled: April 4, 2008Publication date: May 13, 2010Applicant: TOYO TANSO CO., LTD.Inventors: Yoshiaki Hirose, Tetsuya Yuki
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Publication number: 20100048073Abstract: An expanded graphite sheet with improved tensile strength is provided. By using an expanded graphite sheet with improved tensile strength as a lining for a carbonaceous crucible, a method of protecting a carbonaceous crucible is provided that reduces work hours remarkably, makes it possible to cover the inner surface of the crucible without breaking the sheet or producing gaps, and is suitable for increasing the size of the crucible, and a single-crystal pulling apparatus is also provided. An expanded graphite sheet (10) is characterized in that a reinforcing material (12) comprising carbon fibers is formed in a laminate form on at least one side of a substrate (11) made of an expanded graphite material. Another feature is interposing the expanded graphite sheet (10) between a quartz crucible and a carbonaceous crucible in which the quartz crucible is placed, to use the expanded graphite sheet as a lining for covering an inner surface of the carbonaceous crucible.Type: ApplicationFiled: April 11, 2009Publication date: February 25, 2010Applicant: TOYO TANSO CO., LTD.Inventors: Yoshiaki Hirose, Tetsuya Yuki
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Publication number: 20090324886Abstract: [Problems] An object is to provide a mold release sheet, made of expanded graphite, that can achieve high product quality and that can remarkably improve the work efficiency and production yield when silicon carbide, aluminum nitride, or the like is produced by compressing. [Means for Solving the Problems] A mold release sheet (4) disposed between silica powder M and an inner face of an outer member 1b of a mold and made of expanded graphite, characterized in that: the gas permeability represented by the following equation (1) is 1.0×10?4 cm2/s or less, Gas permeability=Q·L/(?P·A),??(1) where Q is the gas flow rate (Pa·cm3/s), ?P is the pressure difference (Pa) between two chambers, A is the gas transmission area (cm2) of the mold release sheet, which is the area of a passage that allows the two chambers to communicate with each other, and L is the thickness (cm) of the mold release sheet.Type: ApplicationFiled: July 26, 2007Publication date: December 31, 2009Applicant: TOYO TANSO CO., LTD.Inventors: Tetsuya Yuki, Yoshiaki Hirose
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Publication number: 20090308307Abstract: A crucible protection sheet is provided that can prevent damages to an inner crucible, hinder an outer crucible from silicon-carbidization, and transmit heat from the outer crucible to the inner crucible uniformly. In a crucible having an inner crucible 2 and an outer crucible 3, the crucible protection sheet is arranged between the two crucibles and is made of expanded graphite. The planar thermal conductivity is 120 W/(m·K) or higher, the gas permeability is less than 1.0×10?4 cm2/s, and the compression ratio is 20% or higher when the sheet is compressed in a thickness direction at a pressure of 34.3 MPa. Since the compression ratio is high, the effect of preventing breakage is great when inserting the inner crucible, improving workability and preventing the inner crucible from tilting inside the outer crucible.Type: ApplicationFiled: July 9, 2007Publication date: December 17, 2009Applicant: TOYO TANSO CO., LTD.Inventors: Yoshiaki Hirose, Tetsuya Yuki, Teruhisa Kondo, Osamu Okada
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Patent number: D781942Type: GrantFiled: May 18, 2012Date of Patent: March 21, 2017Assignee: TOYO TANSO CO., LTD.Inventor: Yoshiaki Hirose