Patents by Inventor Yoshio Tarutani

Yoshio Tarutani 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).

  • Patent number: 10622643
    Abstract: A carbon separator for a solid polymer fuel cell is provided that includes a core material made of steel, and a carbon layer. The chemical composition of the steel is, by mass %, C: more than 0.02% to 0.12% or less, Si: 0.05 to 1.5%, Al: 0.001 to 1.0%, Mn: 0.01 to 1.0%, P: 0.045% or less, S: 0.01% or less, N: 0.06% or less, V: 0.5% or less, Cr: more than 13.0% to less than 25.0%, Mo: 0 to 2.5%, Ni: 0 to 0.8%, Cu: 0 to 0.8%, REM: 0 to 0.1%, B: 0 to 1.0%, Sn: 0 to 2.5%, In: 0 to 0.1%, and the balance: Fe and impurities. The steel has therein precipitates including M23C6 type Cr carbides that are finely precipitated and dispersed. A part of the precipitates protrude from the steel surface.
    Type: Grant
    Filed: September 20, 2016
    Date of Patent: April 14, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventor: Yoshio Tarutani
  • Publication number: 20180269496
    Abstract: A carbon separator for a solid polymer fuel cell is provided that includes a core material made of steel, and a carbon layer. The chemical composition of the steel is, by mass %, C: more than 0.02% to 0.12% or less, Si: 0.05 to 1.5%, Al: 0.001 to 1.0%, Mn: 0.01 to 1.0%, P: 0.045% or less, S: 0.01% or less, N: 0.06% or less, V: 0.5% or less, Cr: more than 13.0% to less than 25.0%, Mo: 0 to 2.5%, Ni: 0 to 0.8%, Cu: 0 to 0.8%, REM: 0 to 0.1%, B: 0 to 1.0%, Sn: 0 to 2.5%, In: 0 to 0.1%, and the balance: Fe and impurities. The steel has therein precipitates including M23C6 type Cr carbides that are finely precipitated and dispersed. A part of the precipitates protrude from the steel surface.
    Type: Application
    Filed: September 20, 2016
    Publication date: September 20, 2018
    Inventor: Yoshio TARUTANI
  • Publication number: 20180053948
    Abstract: There is provided a separator for polymer electrolyte fuel cells having a substrate of a ferritic, having a chemical composition comprising, in mass %, C: 0.001 to 0.012%, Si: 0.01 to 0.6%, Mn: 0.01 to 0.6%, P: 0.035% or less, S: 0.01% or less, Cr: 22.5 to 35.0%, Mo: 0.01 to 4.5%, Ni: 0.01 to 2.5%, Cu: 0.01 to 0.6%, Sn: 0.01 to 1.0%, In: 0.001 to 0.30%, N: 0.015% or less, V: 0.01 to 0.35%, and Al: 0.001 to 0.050%, and the calculated value of {Content of Cr (%)+3×Content of Mo (%)} being 22.5 to 45.0, and includes a surface modified layer containing O: less than 30% and the balance: Sn and In. A polymer electrolyte fuel cell including the separator is remarkably excellent in corrosion resistance in an in-cell environment.
    Type: Application
    Filed: February 9, 2016
    Publication date: February 22, 2018
    Inventor: Yoshio TARUTANI
  • Publication number: 20180034069
    Abstract: There is provided a ferritic stainless steel material that has a chemical composition comprising, in mass %: C: 0.001 to 0.030%, Si: 0.20 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%, Sn: 0.10 to 2.5%, In: 0.001 to 1.0%, N: 0.035% or less, V: 0.01 to 0.35%, Al: 0.001 to 1.0%, and the balance of Fe and inevitable impurities, and the calculated value of {Content of Cr (mass %)+3×Content of Mo (mass %)} being 22.5 to 45.0%. A polymer electrolyte fuel cell including a separator for which the steel material is used is remarkably excellent in corrosion resistance in an in-cell environment and has a contact electric resistance the same as that of a gold-plated member.
    Type: Application
    Filed: February 9, 2016
    Publication date: February 1, 2018
    Inventor: Yoshio TARUTANI
  • 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: 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: 20170301929
    Abstract: A ferritic stainless steel material is provided that has a chemical composition containing, by mass %, C: 0.001 to less than 0.020%, 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%, Sn: 0.02 to 2.50%, rare earth metal: 0 to 0.1%, Nb: 0 to 0.35%, Ti: 0 to 0.35%, and the balance: Fe and impurities, in which a value calculated as {Cr content (mass %)+3×Mo content (mass %)?2.5×B content (mass %)} is from 20 to 45%, and M2B boride-based metallic precipitates are dispersed in and exposed on the surface of a parent phase composed only of a ferritic phase.
    Type: Application
    Filed: September 30, 2015
    Publication date: October 19, 2017
    Inventor: Yoshio TARUTANI
  • Patent number: 8100313
    Abstract: A method for producing a stainless steel three-ply clad sheet for a fuel cell separator comprises heating a source blank and then performing rough rolling, hot rolling and cold rolling thereto, whereby the clad steel sheet for the fuel cell separator or a solid polymer type fuel cell separator thereby is obtained. The source blank for the clad steel sheet is composed of a stainless steel utilizing 0 to 0.3% B as a core component and a stainless steel containing 0.3 to 2.5% B as face component. The source blank is made using face components, a core component, tabs and protectors and performing steps including bonding of the tabs and protectors to the face components, removing portions of the tabs and protectors, piling of the face components to the core component, and further bonding of the face and core components together to form the source blank.
    Type: Grant
    Filed: March 14, 2008
    Date of Patent: January 24, 2012
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Motomichi Kanbe, Kunihiko Ushio, Takeo Yazawa, Hideaki Yamamoto, Yoshio Tarutani, Akira Seki
  • Patent number: 7776486
    Abstract: A separator material effective for decreasing the weight of fuel cells is provided which is lightweight, has good corrosion resistance, and exhibits a minimized increase in electrical contact resistance during use for a long period. Titanium or a titanium alloy is prepared by melting so as to contain not greater than 5 mass % B, thereby forming a titanium-based material in which fine TiB-type boride particles are precipitated and dispersed. The material is then etched in an aqueous acidic solution such that some of the TiB-type boride particles are exposed on the surface through the passive film formed thereon.
    Type: Grant
    Filed: February 26, 2007
    Date of Patent: August 17, 2010
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Yoshio Tarutani, Akira Seki, Takashi Maeda, Wataru Takahashi, Takashi Doi
  • Publication number: 20080220308
    Abstract: Provided is a first method for producing a source blank for a clad steel sheet composed of a stainless steel containing 0 to 0.3% B as a core component and a stainless steel containing 0.3 to 2.
    Type: Application
    Filed: March 14, 2008
    Publication date: September 11, 2008
    Inventors: Motomichi Kanbe, Kunihiko Ushio, Takeo Yazawa, Hideaki Yamamoto, Yoshio Tarutani, Akira Seki
  • Publication number: 20070259221
    Abstract: A separator material effective for decreasing the weight of fuel cells is provided which is lightweight, has good corrosion resistance, and exhibits a minimized increase in electrical contact resistance during use for a long period. Titanium or a titanium alloy is prepared by melting so as to contain not greater than 5 mass % B, thereby forming a titanium-based material in which fine TiB-type boride particles are precipitated and dispersed. The material is then etched in an aqueous acidic solution such that some of the TiB-type boride particles are exposed on the surface through the passive film formed thereon.
    Type: Application
    Filed: February 26, 2007
    Publication date: November 8, 2007
    Inventors: Yoshio Tarutani, Akira Seki, Takashi Maeda, Wataru Takahashi, Takashi Doi
  • Patent number: 6379476
    Abstract: The stainless steel product has passive film on the surface, and at least one of a conductive metallic inclusion of carbide and a conductive metallic inclusion of boride protrudes through an outer surface of passive film from stainless steel under the passive film. The stainless steel product has low contact electrical resistance and suitable for use in bipolar plates of a polymer electrode fuel cell.
    Type: Grant
    Filed: April 13, 2000
    Date of Patent: April 30, 2002
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Yoshio Tarutani, Takashi Doi, Akira Seki, Shinji Fukuta
  • Patent number: 5944917
    Abstract: A stainless steel having excellent corrosion resistance to ozone added water, such as ozone added ultrapure water used in semiconductor manufacturing processes and the like, as well as a manufacturing method. The stainless steel comprises a base metal and an oxide film formed on the surface of the base metal, the base metal being a stainless steel which contains 12 to 30% of Cr, 0 to 35% of Ni, and 1 to 6% of Al and Si while the contents of the other alloying elements are limited to as low a level as possible, the oxide film mainly comprising Al oxide or a Si oxide or both. The oxide film may be formed on the base metal surface through the dry oxidation process or the wet oxidation process. In the stainless steel, metallic ions are rarely dissolved from the base metal into the ozone added water.
    Type: Grant
    Filed: May 29, 1997
    Date of Patent: August 31, 1999
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Kiyoko Takeda, Shigeki Azuma, Yoshio Tarutani, Yoshitaka Nishiyama, Yasushi Matsuda
  • Patent number: 5449579
    Abstract: The invention or the instant application relates to a process for manufacturing a colored metal plate, in that forming an electrophotosensitive layer mainly composed of titanium dioxide and a binder resin on a metal plate as a raw material having a smooth surface of 2 .mu.m Ra or less in the center line average height, and then forming an toner image having a surface granularity of 0.3 or less on the photosensitive layer by electrophotographic method.
    Type: Grant
    Filed: October 18, 1994
    Date of Patent: September 12, 1995
    Assignee: Ishihara Sangyo Kaisha Ltd.
    Inventors: Yoshio Tarutani, Hajime Murakami
  • Patent number: 4812177
    Abstract: A superplastic hot working method for a duplex-phase, nitrogen-containing ferrous alloy and stainless steel, and a superplastic duplex-phase ferrous alloy are disclosed. The ferrous alloy comprises: at least one of Si and Mn in an amount of not less than 0.5 % and not less than 1.7%, respectively; and N: at least 0.01% in solid solution, wherein Si eq and Mn eq which are defined as: Si eq=Si+(2/3) (Cr+Mo), and Mn eq=Mn+2Ni+60C+50N, satisfy the formula:(5/6) (Si eq)-15/2.ltoreq.Mn eq.ltoreq.(11/5)(Si eq)-77/5,and its superplastic hot working is carried out by deforming the alloy heated to 700.degree.-1200.degree. C. at a strain rate of 1.times.10.sup.-6 S.sup.-1 to 1.times.10.sup.0 S.sup.-1. In another aspect, superplastic hot working of a duplex-phase stainless steel comprising Cr: 10.0-35.0%, Ni: 2.0-18.0%; Mo: 0-6.0%, and N: 0.005-0.3% and having the values of Si eq and Mn eq as above is carried out by deforming the steel at a strain rate of from 1.times.10.sup.-6 S.sup.-1 to 1.times.10.sup.1 S.sup.
    Type: Grant
    Filed: January 25, 1988
    Date of Patent: March 14, 1989
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Yasuhiro Maehara, Yoshio Tarutani
  • Patent number: 4770703
    Abstract: A sintered stainless steel exhibiting improved resistance to stress corrosion cracking which comprises a matrix phase and a dispersed phase and a process for manufacturing same are disclosed. The dispersed phase is of an austenitic metallurgical structure and is dispersed throughout the matrix phase which is comprised of an austenitic metallurgical structure having a steel composition different from that of the dispersed phase or a ferrite-austenite duplex stainless steel.
    Type: Grant
    Filed: June 4, 1985
    Date of Patent: September 13, 1988
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Yoshio Tarutani, Takeo Kudo, Akira Seki, Masaru Nishiguchi
  • Patent number: 4721600
    Abstract: A superplastic hot working method for a duplex-phase, nitrogen-containing ferrous alloy and stainless steel, and a superplastic duplex-phase ferrous alloy are disclosed. The ferrous alloy comprises: at least one of Si and Mn in an amount of not less than 0.5% and not less than 1.7%, respectively; and N: at least 0.01% in solid solution, wherein Si eq and Mn eq which are defined as:Si eq=Si+(2/3)(Cr+Mo), and Mn eq=Mn+2 Ni+60 C+50 N,satisfy the formula:(5/6)(Si eq)-15/2.ltoreq.Mn eq.ltoreq.(11/5)(Si eq)-77/5,and its superplastic hot working is carried out by deforming the alloy heated to 700.degree.-1200.degree. C. at a strain rate of 1.times.10.sup.-6 S.sup.-1 to 1.times.10.sup.0 S.sup.-1. In another aspect, superplastic hot working of a duplex-phase stainless steel comprising Cr: 10.0-35.0%, Ni: 2.0-18.0%, Mo: 0-6.0%, and N: 0.005-0.3% and having the values of Si eq and Mn eq as above is carried out by deforming the steel at a strain rate of from 1.times.10.sup.-6 S.sup.-1 to 1.times.10.sup.1 S.sup.
    Type: Grant
    Filed: March 27, 1986
    Date of Patent: January 26, 1988
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Yasuhiro Maehara, Yoshio Tarutani
  • Patent number: 4581202
    Abstract: A sintered stainless steel and sintered seamless steel pipe exhibiting improved resistance to stress corrosion cracking are disclosed. The metallurgical structure comprises a matrix phase and a dispersing phase, which are different from each other in their metallurgical structures, the matrix phase comprising a substantially single ferritic structure, and the dispersing phase comprising a structure selected from the group consisting of an austenitic structure, an austenitic+ferritic dual phase structure, an austenitic+martensitic dual phase structure, and an austenitic+ferritic+martensitic triple phase structure. The sintered seamless stainless steel pipes are useful as heat exchanging tubes and piping to which sea water or industrial water is fed.
    Type: Grant
    Filed: March 11, 1985
    Date of Patent: April 8, 1986
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Takeo Kudo, Yoshio Tarutani
  • Patent number: 4360381
    Abstract: A 10-35% Cr ferritic stainless steel stabilized with 0.20-1.00% of Nb wherein Nb%.gtoreq.(8.times.C%+2.0%) with impurities, such as carbon, nitrogen, phosphorous, oxygen and sulfur reduced to given levels is disclosed. By reducing the sulfur content to a level of not greater than 0.002%, preferably less than 0.001% or in cases where copper and/or nickel is added, to a level of not greater than 0.005%, the corrosion resistance of the resulting steel can markedly be improved. Since the ferritic stainless steel of this invention also exhibits a combination of good surface appearance and formability, it can be substituted for certain austenitic stainless steels not only as a general corrosion resistant material, but also as a material for making external automotive trims and so on.
    Type: Grant
    Filed: April 7, 1981
    Date of Patent: November 23, 1982
    Assignees: Sumitomo Metal Industries, Ltd., Nippon Stainless Steel Co., Ltd.
    Inventors: Yoshio Tarutani, Taishi Moroishi, Masao Koike