Patents by Inventor Yuuichi Fujii
Yuuichi Fujii 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: 10968328Abstract: The present invention pertains to a porous polyimide film production method and a porous polyimide film produced using said method, said method including: a step (1) in which a poly(amic acid) solution comprising 40%-97% by mass organic polar solvent and 3%-60% by mass poly(amic acid) having an intrinsic viscosity, comprising tetracarboxylic acid units and diamine units, of 1.0-3.0 is cast in film form and immersed in or caused to come in contact with a coagulating solvent having water as an essential component thereof, and a porous film of poly(amic acid) is produced; and a step (2) in which the porous film of poly(amic acid) obtained in said step is heat treated and imidized. Shrinkage in the film longitudinal direction and transverse direction after heat treatment is suppressed to no more than 8% for each direction and the speed of temperature increase in a temperature range of at least 200° C. during the heat treatment is at least 25° C./min.Type: GrantFiled: July 25, 2017Date of Patent: April 6, 2021Assignee: UBE INDUSTRIES, LTD.Inventors: Shusei Ohya, Makoto Matsuo, Yuuichi Fujii, Keita Bamba
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Publication number: 20190263997Abstract: The present invention pertains to a porous polyimide film production method and a porous polyimide film produced using said method, said method including: a step (1) in which a poly(amic acid) solution comprising 40%-97% by mass organic polar solvent and 3%-60% by mass poly(amic acid) having an intrinsic viscosity, comprising tetracarboxylic acid units and diamine units, of 1.0-3.0 is cast in film form and immersed in or caused to come in contact with a coagulating solvent having water as an essential component thereof, and a porous film of poly(amic acid) is produced; and a step (2) in which the porous film of poly(amic acid) obtained in said step is heat treated and imidized. Shrinkage in the film longitudinal direction and transverse direction after heat treatment is suppressed to no more than 8% for each direction and the speed of temperature increase in a temperature range of at least 200° C. during the heat treatment is at least 25° C./min.Type: ApplicationFiled: July 25, 2017Publication date: August 29, 2019Applicant: Ube Industries, Ltd.Inventors: Shusei OHYA, Makoto MATSUO, Yuuichi FUJII, Keita BAMBA
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Patent number: 8980421Abstract: A porous polyimide film having a three-layer structure that comprises two surface layers (a) and (b) and a macrovoid layer sandwiched between the surfaces layers (a) and (b). The macrovoid layer has a partition wall bonding to the surface layers (a) and (b), and multiple macrovoids each surrounded by the partition wall and the surface layers (a) and (b) and having a mean pore size in the film plane direction of from 10 to 500 ?m. The partition wall of the macrovoid layer has a thickness of from 0.1 to 50 ?m and has multiple pores having a mean pore size of from 0.01 to 50 ?m. The surface layers (a) and (b) each have a thickness of from 0.1 to 50 ?m, at least one of the surface layers has multiple pores having a mean pore size of from more than 5 ?m to 200 ?m, and the other surface layer has multiple pores having a mean pore size of from 0.01 to 200 ?m.Type: GrantFiled: April 4, 2011Date of Patent: March 17, 2015Assignee: Ube Industries, Ltd.Inventors: Shyusei Ohya, Hiroshi Shimazaki, Makoto Babazono, Yoshiaki Watanabe, Dai Yokoyama, Yuuichi Fujii, Makoto Matsuo
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Publication number: 20130045355Abstract: A porous polyimide film having a three-layer structure that comprises two surface layers (a) and (b) and a macrovoid layer sandwiched between the surfaces layers (a) and (b). The macrovoid layer has a partition wall bonding to the surface layers (a) and (b), and multiple macrovoids each surrounded by the partition wall and the surface layers (a) and (b) and having a mean pore size in the film plane direction of from 10 to 500 ?m. The partition wall of the macrovoid layer has a thickness of from 0.1 to 50 ?m and has multiple pores having a mean pore size of from 0.01 to 50 ?m. The surface layers (a) and (b) each have a thickness of from 0.1 to 50 ?m, at least one of the surface layers has multiple pores having a mean pore size of from more than 5 ?m to 200 ?m, and the other surface layer has multiple pores having a mean pore size of from 0.01 to 200 ?m.Type: ApplicationFiled: April 4, 2011Publication date: February 21, 2013Applicant: UBE INDUSTRIES, LTDInventors: Shyusei Ohya, Hiroshi Shimazaki, Makoto Babazono, Yoshiakia Watanabe, Dai Yokoyama, Yuuichi Fujii, Makoto Matsuo
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Patent number: 7468340Abstract: A metal-supported porous carbon film wherein metal fine particles with a mean particle diameter of 0.7-20 nm are dispersed and supported on pore surface walls, fuel cell electrodes employing the metal-supported porous carbon film, a membrane-electrode assembly comprising the fuel cell electrodes bonded on both sides of a polymer electrolyte film, and a fuel cell comprising the fuel cell electrode as a constituent element. The support structure is such that metal fine particles having a controlled particle size are uniformly supported to allow effective utilization of the metal-based catalyst, and the fabrication steps are simple.Type: GrantFiled: April 8, 2004Date of Patent: December 23, 2008Assignee: Ube Industries, Ltd.Inventors: Shyusei Ohya, Yuuichi Fujii, Makoto Matsuo, Jun Takagi
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Publication number: 20070082805Abstract: Disclosed are a carbon porous membranous structure having fine interconnecting pores an average diameter of which is 0.05 to 10 ?m and a porosity of 15 to 85% and a metal-dispersed carbon structure comprising that carbon porous membranous structure having dispersed therein fine particles of at least one kind of a metal and an alloy. The carbon porous membranous structures are useful as a component of fuel cells, particularly as an electrode base material of gas diffusion electrodes for solid polymer electrolyte fuel cells and phosphoric acid fuel cells.Type: ApplicationFiled: December 11, 2006Publication date: April 12, 2007Applicant: UBE INDUSTRIES, LTD.Inventors: Shyusei Ohya, Jun Takagi, Yuuichi Fujii, Shigeru Yao
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Publication number: 20070077460Abstract: A metal-supported porous carbon film wherein metal fine particles with a mean particle diameter of 0.7-20 nm are dispersed and supported on pore surface walls, fuel cell electrodes employing the metal-supported porous carbon film, a membrane-electrode assembly comprising the fuel cell electrodes bonded on both sides of a polymer electrolyte film, and a fuel cell comprising the fuel cell electrode as a constituent element. The support structure is such that metal fine particles having a controlled particle size are uniformly supported to allow effective utilization of the metal-based catalyst, and the fabrication steps are simple.Type: ApplicationFiled: April 8, 2004Publication date: April 5, 2007Inventors: Shyusei Ohya, Yuuichi Fujii, Makoto Matsuo, Jun Takagi
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Publication number: 20040265676Abstract: A polymer electrolyte solution useful in the fabrication of solid polymer electrolyte fuel cell electrodes, characterized by comprising a solvent containing a hydrophilic and high-boiling polar solvent, preferably a mixed solvent mainly comprising the polar solvent and water, having dissolved therein a perfluorocarbon sulfonic acid polymer.Type: ApplicationFiled: April 21, 2004Publication date: December 30, 2004Inventors: Jun Takagi, Shyusei Ohya, Yuuichi Fujii
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Patent number: 6565962Abstract: A polyimide porous film obtained by drying and imidizing a polyimide precursor porous film which is substantially homogeneous on both sides, the polyimide porous film having pores on both sides wherein the pores all satisfy the conditions: 1) the difference in the mean pore size of both sides is less than 200% based on the smaller average value of the mean pore size, 2) the coefficient of variation for the pore size on each side is smaller than 70%, 3) the coefficient of variation for the pore centroid distance on each side is smaller than 50%, and 4) the mean pore size on each side is 0.05-5 &mgr;m.Type: GrantFiled: July 22, 2002Date of Patent: May 20, 2003Assignee: Ube Industries, Ltd.Inventors: Shyusei Ohya, Yuuichi Fujii, Shigeru Yao, Yukihiko Asano, Kimio Nakayama, Kenji Fukunaga
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Publication number: 20030018094Abstract: A polyimide porous film obtained by drying and imidizing a polyimide precursor porous film which is substantially homogeneous on both sides, the polyimide porous film having pores on both sides wherein the pores all satisfy the conditions: 1) the difference in the mean pore size of both sides is less than 200% based on the smaller average value of the mean pore size, 2) the coefficient of variation for the pore size on each side is smaller than 70%, 3) the coefficient of variation for the pore centroid distance on each side is smaller than 50%, and 4) the mean pore size on each side is 0.05-5 &mgr;m.Type: ApplicationFiled: July 22, 2002Publication date: January 23, 2003Applicant: UBE INDUSTRIES, LTD.Inventors: Shyusei Ohya, Yuuichi Fujii, Shigeru Yao, Yukihiko Asano, Kimio Nakayama, Kenji Fukunaga
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Publication number: 20020132159Abstract: Disclosed are a carbon porous membranous structure having fine interconnecting pores an average diameter of which is 0.05 to 10 &mgr;m and a porosity of 15 to 85% and a metal-dispersed carbon structure comprising that carbon porous membranous structure having dispersed therein fine particles of at least one kind of a metal and an alloy. The carbon porous membranous structures are useful as a component of fuel cells, particularly as an electrode base material of gas diffusion electrodes for solid polymer electrolyte fuel cells and phosphoric acid fuel cells.Type: ApplicationFiled: March 18, 2002Publication date: September 19, 2002Applicant: UBE INDUSTRIES, LTD.Inventors: Shyusei Ohya, Jun Takagi, Yuuichi Fujii, Shigeru Yao
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Patent number: 5459160Abstract: Iridoid derivatives synthesized using genipin, which is an aglycon of geniposide, as the starting material are useful as an anti-hyperlipemia agent and as a cholagogue.Type: GrantFiled: June 23, 1994Date of Patent: October 17, 1995Assignee: Tsumura & Co.Inventors: Yuuichi Fujii, Ichiro Arai, Akira Hatta, Akemi Tatsugi, Hiroshi Mitsuhashi, deceased, by Mieko Mitsuhashi, legal representative, by Hiroyuki Mitsuhashi, legal representative, by Tomoaki Mitsuhashi, legal representative, Masaharu Kigawa
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Patent number: 5272172Abstract: Iridoid derivatives synthesized using genipin, which is an aglycon of geniposide, as the starting material are useful as an anti-hyperlipemia agent and as a cholagogue.Type: GrantFiled: August 6, 1992Date of Patent: December 21, 1993Assignee: Tsumura & Co.Inventors: Yuuichi Fujii, Ichiro Arai, Akira Hatta, Akemi Tatsugi, Hiroshi Mitsuhashi, Mieko Mitsuhashi, Hiroyuki Mitsuhashi, Tomoyuki Mitsuhashi, Masaharu Kigawa