Patents by Inventor Junko Imamura

Junko Imamura 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).

  • Publication number: 20200283867
    Abstract: Provided are a stainless steel sheet with good corrosion resistance, low contact resistance and good press workability without the use of expensive materials such as gold or rare metals, and a method of manufacture the same. A method of manufacturing a stainless steel sheet includes: preparing a slab having a chemical composition including, in mass %: 20 to 26% Cr, up to 0.1% N, up to 2.0% Si, etc. (step S1); performing hot rolling and cold rolling on the slab to produce a rolled steel sheet with a thickness of 50 to 200 ?m (step S2); an annealing step in which the rolled steel sheet is annealed and cooled in a gas atmosphere containing nitrogen (step S3); and pickling the rolled steel sheet after the annealing step with a solution containing a non-oxidizing acid (step S4). The stainless steel sheet has an N content of 0.6 to 2.0% by mass.
    Type: Application
    Filed: September 19, 2017
    Publication date: September 10, 2020
    Applicant: NIPPON STEEL STAINLESS STEEL CORPORATION
    Inventors: Hideya KAMINAKA, Yoshitaka NISHIYAMA, Koichi NOSE, Jun MAKI, Junko IMAMURA, Kohei MAEJIMA, Yuya TAKASHIMA
  • Publication number: 20200091523
    Abstract: A titanium material including a base metal made of pure titanium or a titanium alloy and a titanium oxide film formed on the base metal. Peak intensities obtained by thin-film X-ray diffraction analysis performed on an outer layer of the titanium material using an incident angle of 0.3° satisfy (I(104)+I(200))/I(101)?0.08?0.004×I(200), where I(104) is the peak intensity resulting from a plane (104) of a Ti2O3 phase, I(200) is the peak intensity resulting from a plane (200) of a TiO phase, I(101) is the peak intensity resulting from a plane (101) of an ?-Ti phase, and 0<I(104), 0?I(200), and 0<I(101). The titanium material is inexpensive and has both the electrical conductivity and corrosion resistance.
    Type: Application
    Filed: December 18, 2017
    Publication date: March 19, 2020
    Inventors: Hideya Kaminaka, Yoshitaka Nishiyama, Koichi Nose, Junko Imamura, Haruka Sato
  • Patent number: 10505205
    Abstract: A titanium product for a separator of a proton exchange membrane fuel cell according to the present invention includes: a base material that consists of commercially pure titanium; a first oxide layer that is formed in a surface layer of the titanium product, consists of TiO2 of a rutile crystallinity, and has a thickness of 0.1 to 1.5 nm; and a second oxide layer that is formed between the base material and the first oxide layer, consists of TiOx (1<x<2), and has a thickness of 3 to 20 nm. This titanium product is suitable to be used as a separator of a proton exchange membrane fuel cell that has a high corrosion resistance in an environment in a fuel cell, is capable of keeping a low contact resistance with an electrode consisting of carbon fiber and the like, and is inexpensive.
    Type: Grant
    Filed: March 3, 2016
    Date of Patent: December 10, 2019
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Junko Imamura, Yoshitaka Nishiyama, Yasuhiro Masaki, Jun Maki, Shunsuke Taniguchi, Hideya Kaminaka
  • Patent number: 10305119
    Abstract: In a titanium material or a titanium alloy material, in an oxide film formed on a surface of a titanium or a titanium alloy, the composition ratio of TiO (ITiO/(ITi+ITiO)×100 found from the maximum intensity of the X-ray diffraction peaks of TiO (ITiO) and the maximum intensity of the X-ray diffraction peaks of metal titanium (ITi) in X-ray diffraction measured at an incident angle to the surface of 0.3° is 0.5% or more. A titanium material or a titanium alloy material, and a fuel cell separator and a polymer electrolyte fuel cell having good contact-to-carbon electrical conductivity and good durability can be provided.
    Type: Grant
    Filed: January 22, 2015
    Date of Patent: May 28, 2019
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kazuhiro Takahashi, Taku Kagawa, Masanari Kimoto, Junko Imamura, Kiyonori Tokuno, Atsuhiko Kuroda
  • Patent number: 10230115
    Abstract: Provided is a metallic material including: a base metal made of a metal; a metal compound layer stacked on a surface of the base metal, the metal compound layer mainly containing a compound of at least one transition metal in the fourth period and oxygen; a platinum group portion dispersed on a surface of the metal compound layer, the platinum group portion mainly containing at least one platinum group element; and a platinum group compound coating film which covers the platinum group portion, the platinum group compound coating film mainly containing a compound of at least one platinum group element and oxygen. The at least one platinum group element contained in the platinum group portion is preferably one or more of Ru, Rh, Os, and Ir.
    Type: Grant
    Filed: August 18, 2015
    Date of Patent: March 12, 2019
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Yoshitaka Nishiyama, Junko Imamura, Yasuhiro Masaki, Masanari Kimoto
  • Publication number: 20180323447
    Abstract: This titanium product includes a base metal, and a complex oxide film formed on the surface of the base metal. The base metal has a chemical composition consisting of, by mass %, platinum group elements: 0 to 0.15%, rare earth elements: 0 to 0.1%, and a balance: Ti and impurities. The complex oxide film contains a complex oxide of Ti and one or more elements selected from La, Ce, Nd, Sr and Ca, and has a thickness of 1 to 20 nm. The average grain size at the base metal surface is preferably from 20 to 300 ?m.
    Type: Application
    Filed: November 8, 2016
    Publication date: November 8, 2018
    Inventors: Junko IMAMURA, Jun MAKI, Koichi NOSE, Hideya KAMINAKA
  • Patent number: 10033052
    Abstract: The composition ratio of a titanium hydride [ITi—H/(ITi+ITi—H)]×100 found from the maximum intensity of metal titanium (ITi) and the maximum intensity of the titanium hydride (ITi—H) of the X-ray diffraction peaks measured at a surface of a titanium or a titanium alloy at an incident angle to the surface of 0.3° is 55% or more, a titanium oxide film is formed on an outermost surface of the titanium or the titanium alloy, and C is at 10 atomic % or less, N is at 1 atomic % or less, and B is at 1 atomic % or less in a position where the surface has been subjected to sputtering of 5 nm with argon. The titanium oxide film is formed by performing stabilization treatment after performing passivation treatment in prescribed aqueous solutions, and has a thickness of 3 to 10 nm.
    Type: Grant
    Filed: January 22, 2015
    Date of Patent: July 24, 2018
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kazuhiro Takahashi, Taku Kagawa, Masanari Kimoto, Junko Imamura, Kiyonori Tokuno, Atsuhiko Kuroda
  • Publication number: 20180191000
    Abstract: There is provided a titanium product for a separator of a polymer electrolyte fuel cell (PEFC). The titanium product includes a substrate made of a titanium or a titanium alloy, and a passivation film formed on a surface of the substrate, wherein the passivation film includes a Li-containing titanium oxide layer in its surface layer. This titanium product can keep a low contact resistance with an electrode film and is inexpensive.
    Type: Application
    Filed: June 29, 2016
    Publication date: July 5, 2018
    Inventors: Junko IMAMURA, Yasuhiro MASAKI, Saho TAKEBE, Hideya KAMINAKA
  • Publication number: 20180047997
    Abstract: A titanium product for a separator of a proton exchange membrane fuel cell according to the present invention includes: a base material that consists of commercially pure titanium; a first oxide layer that is formed in a surface layer of the titanium product, consists of TiO2 of a rutile crystallinity, and has a thickness of 0.1 to 1.5 nm; and a second oxide layer that is formed between the base material and the first oxide layer, consists of TiOx (1<x<2), and has a thickness of 3 to 20 nm. This titanium product is suitable to be used as a separator of a proton exchange membrane fuel cell that has a high corrosion resistance in an environment in a fuel cell, is capable of keeping a low contact resistance with an electrode consisting of carbon fiber and the like, and is inexpensive.
    Type: Application
    Filed: March 3, 2016
    Publication date: February 15, 2018
    Inventors: Junko IMAMURA, Yoshitaka NISHIYAMA, Yasuhiro MASAKI, Jun MAKI, Shunsuke TANIGUCHI, Hideya KAMINAKA
  • Publication number: 20180034070
    Abstract: A stainless steel sheet used for a separator of a polymer electrolyte fuel cell, wherein the steel sheet has a volume ratio of M2B boride-based metal precipitates of 8% or higher and a volumetric-basis particle-size frequency distribution of M2B boride-based metal precipitates having sphere-equivalent diameters of 6.72 ?m or less of 99.5% or higher, in a surface layer which has a depth of 0.2 t from at least one of surfaces (t is an overall thickness of the steel sheet), and the steel sheet has an apparent density of 0.995 or higher, assuming a real density to be 1. A polymer electrolyte fuel cell in which the stainless steel sheet is used for a separator is given an excellent cell performance without high-cost surface treatment such as expensive gold plating for the reduction of the contact resistance of a surface.
    Type: Application
    Filed: February 24, 2016
    Publication date: February 1, 2018
    Inventors: Yoshio TARUTANI, Ryuji HAMADA, Takeo YAZAWA, Akira SEKI, Kazuhiko ADACHI, Junko IMAMURA
  • Publication number: 20170327915
    Abstract: A duplex stainless steel is provided that has a chemical composition comprising, by mass %, C: 0.03% or less, Si: 1.0% or less, Mn: 1.0% or less, P: 0.04% or less, S: 0.01% or less, Cu: 0.1 to 1.0%, Ni: 5.0 to 7.5%, Cr: 22.0 to 26.0%, W: 6.0 to 12.0%, N: 0.20 to 0.32%, Mo: 0.01% or less, and a balance: Fe and impurities, in which a metal micro-structure contains, by area ratio, 0.40 to 0.60 of an ?-phase, with a balance being a ?-phase and 0.01 or less of other phases.
    Type: Application
    Filed: October 23, 2015
    Publication date: November 16, 2017
    Inventors: Hiroshi KAMIO, Hideya KAMINAKA, Junko IMAMURA, Kouichi TAKEUCHI
  • Publication number: 20170298488
    Abstract: A ferritic stainless steel material contains, by mass %, C: 0.02 to 0.15%, Si: 0.01 to 1.5%, Mn: 0.01 to 1.5%, P: 0.035% or less, S: 0.01% or less, Cr: 22.5 to 35.0%, Mo: 0.01 to 6.0%, Ni: 0.01 to 6.0%, Cu: 0.01 to 1.0%, N: 0.035% or less, V: 0.01 to 0.35%, B: 0.5 to 1.0%, Al: 0.001 to 6.0%, rare earth metal: 0 to 0.10%, Sn: 0 to 2.50%, and the balance: Fe and impurities, and a value calculated in mass % as {Cr+3×Mo?2.5×B?17×C} ranges from 20 to 45%. The ferritic stainless steel material has a parent phase comprising only a ferritic phase. At least composite metallic precipitates including M23C6 carbide-based metallic precipitates precipitated on surfaces and at peripheries of M2B boride-based metallic precipitates serving as precipitation nuclei are dispersed and exposed on a parent phase surface.
    Type: Application
    Filed: September 30, 2015
    Publication date: October 19, 2017
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Yoshio TARUTANI, Takeo YAZAWA, Ryuji HAMADA, Akira SEKI, Junko IMAMURA
  • Publication number: 20170237084
    Abstract: Provided is a metallic material including: a base metal made of a metal; a metal compound layer stacked on a surface of the base metal, the metal compound layer mainly containing a compound of at least one transition metal in the fourth period and oxygen; a platinum group portion dispersed on a surface of the metal compound layer, the platinum group portion mainly containing at least one platinum group element; and a platinum group compound coating film which covers the platinum group portion, the platinum group compound coating film mainly containing a compound of at least one platinum group element and oxygen. The at least one platinum group element contained in the platinum group portion is preferably one or more of Ru, Rh, Os, and Ir.
    Type: Application
    Filed: August 18, 2015
    Publication date: August 17, 2017
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Yoshitaka NISHIYAMA, Junko IMAMURA, Yasuhiro MASAKI, Masanari KIMOTO
  • Patent number: 9680162
    Abstract: A stainless steel member for a separator of a solid polymer fuel cell has excellent cell properties with little deterioration in performance over long periods of operation without worsening of the corrosion resistance of a stainless steel separator. The stainless steel member has a stainless steel base metal, and a passive film and electrically conductive precipitates both provided on a surface of the stainless steel base metal. The electrically conductive precipitate penetrates the passive film and includes a substance originating from the stainless steel base metal. An electrically conductive layer comprising a nonmetallic electrically conductive substance is preferably provided on the surface of the passive film, and the electrically conductive layer is preferably electrically connected to the stainless steel base member through the electrically conductive precipitates.
    Type: Grant
    Filed: April 6, 2011
    Date of Patent: June 13, 2017
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Hideya Kaminaka, Junko Imamura, Akira Seki, Kouichi Takeuchi
  • Publication number: 20170077527
    Abstract: A titanium material comprises: a plate-like matrix made of titanium or a titanium alloy and having a rough surface on which minute protrusions are formed; a surface oxide coating film formed along the rough surface and containing one or more titanium oxides; and a tip covering formed on the surface oxide coating film in an area comprising a tip of the minute protrusion and containing one or more noble metals. A composition ratio of TiO [ITiO/(ITi+ITiO)×100] determined from maximum intensity ITiO of diffraction peaks of TiO and maximum intensity ITi of diffraction peaks of metal Ti in an X-ray diffraction intensity curve of the surface oxide coating film is more than or equal to 0.5%.
    Type: Application
    Filed: June 1, 2015
    Publication date: March 16, 2017
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Junko IMAMURA, Kiyonori TOKUNO, Taku KAGAWA, Masanari KIMOTO, Yasuhiro MASAKI
  • Publication number: 20160336600
    Abstract: A composite metal foil in which the surface of a titanium foil or a titanium alloy foil is coated with an electrically conductive layer; in the composite metal foil, an electrically conductive film in which TiO is dispersed in an oxide film and the TiO composition ratio [ITiO/(ITi+ITiO)] found from the maximum intensity of the diffraction peaks of TiO (ITiO) and the maximum intensity of the diffraction peaks of metal titanium (ITi) out of the X-ray diffraction peaks of the surface of the titanium foil or the titanium alloy foil is 0.5% or more is formed on the surface of the titanium foil or the titanium alloy foil, and the electrically conductive layer consists of, in mass %, silver particles with an average particle size of not less than 10 nm and not more than 500 nm: 20% to 90%, a dispersant: 0.2% to 1.0%, and the balance: an acrylic resin or an epoxy resin, and has a thickness of 5 to 50 ?m.
    Type: Application
    Filed: April 2, 2015
    Publication date: November 17, 2016
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Taku KAGAWA, Kazuhiro TAKAHASHI, Takashi IIJIMA, Masanari KIMOTO, Junko IMAMURA, Kiyonori TOKUNO, Atsuhiko KURODA
  • Publication number: 20160329575
    Abstract: In a titanium material or a titanium alloy material, in an oxide film formed on a surface of a titanium or a titanium alloy, the composition ratio of TiO (ITiO/(ITi+ITiO)×100 found from the maximum intensity of the X-ray diffraction peaks of TiO (ITiO) and the maximum intensity of the X-ray diffraction peaks of metal titanium (ITi) in X-ray diffraction measured at an incident angle to the surface of 0.3° is 0.5% or more. A titanium material or a titanium alloy material, and a fuel cell separator and a polymer electrolyte fuel cell having good contact-to-carbon electrical conductivity and good durability can be provided.
    Type: Application
    Filed: January 22, 2015
    Publication date: November 10, 2016
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kazuhiro TAKAHASHI, Taku KAGAWA, Masanari KIMOTO, Junko IMAMURA, Kiyonori TOKUNO, Atsuhiko KURODA
  • Publication number: 20160308222
    Abstract: The composition ratio of a titanium hydride [ITi—H/(ITi+ITi—H)]×100 found from the maximum intensity of metal titanium (ITi) and the maximum intensity of the titanium hydride (ITi—H) of the X-ray diffraction peaks measured at a surface of a titanium or a titanium alloy at an incident angle to the surface of 0.3° is 55% or more, a titanium oxide film is formed on an outermost surface of the titanium or the titanium alloy, and C is at 10 atomic % or less, N is at 1 atomic % or less, and B is at 1 atomic % or less in a position where the surface has been subjected to sputtering of 5 nm with argon. The titanium oxide film is formed by performing stabilization treatment after performing passivation treatment in prescribed aqueous solutions, and has a thickness of 3 to 10 nm.
    Type: Application
    Filed: January 22, 2015
    Publication date: October 20, 2016
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kazuhiro TAKAHASHI, Taku KAGAWA, Masanari KIMOTO, Junko IMAMURA, Kiyonori TOKUNO, Atsuhiko KURODA
  • Patent number: 9312546
    Abstract: A stainless steel member comprising a stainless steel base metal; an oxide film located on the surface of the stainless steel base metal; an electroconductive layer located on the surface of the oxide film and comprising a nonmetallic electroconductive material; and an electroconductive material which is located so as to penetrate the oxide film and which electrically contacts the stainless steel base metal and the electroconductive layer is provided as a stainless steel member for a separator of a solid polymer fuel cell having excellent properties such that a degradation in performance is low even after prolonged operation. A solid polymer fuel cell using the stainless steel member is also provided.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: April 12, 2016
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Hideya Kaminaka, Junko Imamura, Yasuto Higashida
  • Patent number: 8603263
    Abstract: The present invention provides a duplex stainless steel having excellent resistance to alkalis and particularly corrosion resistance against high-temperature concentrated alkali solutions and excellent weldability. The duplex stainless steel has a chemical composition comprising, in mass %, C: at most 0.03%, Si: at most 0.5%, Mn: at most 2.0%, P: at most 0.04%, S: at most 0.003%, Cr: at least 25.0% to less than 28.0%, Ni: at least 6.0% to at most 10.0%, Mo: at least 0.2% to at most 3.5%, N: less than 0.5%, W: at most 3.0%, and a remainder of Fe and impurities.
    Type: Grant
    Filed: May 1, 2012
    Date of Patent: December 10, 2013
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Hideya Kaminaka, Junichi Higuchi, Yoshiaki Yamade, Shuuji Yoshida, Junko Imamura