Patents by Inventor Tatsumi Kimura
Tatsumi Kimura 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: 20130174945Abstract: The present invention provides bearing steel, comprising a chemical composition including by mass %, C: 0.56%?[% C]?0.70%, Si: 0.15%?[% Si]<0.50%, Mn: 0.60%?[% Mn]?1.50%, Cr: 0.50%?[% Cr]?1.10%, Mo: 0.05%?[% Mo]?0.5%, P: [% P]?0.025%, S: [% S]?0.025%, Al: 0.005%?[% Al]?0.500%, O: [% O]?0.0015%, N: 0.0030%?[% N]?0.015%, and remainder as Fe and incidental impurities.Type: ApplicationFiled: May 24, 2011Publication date: July 11, 2013Applicants: NTN CORPORATION, JFE STEEL CORPORATIONInventors: Minoru Honjo, Kazukuni Hase, Tatsumi Kimura, Shinji Mitao
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Patent number: 8404178Abstract: The invention provides a high-strength pearlitic steel rail, which is inexpensive, and has a tensile strength of 1200 MPa or more, and is excellent in delayed fracture properties. Specifically, the rail contains, in mass percent, C of 0.6 to 1.0%, Si of 0.1 to 1.5%, Mn of 0.4 to 2.0%, P of 0.035% or less, S of 0.0005 to 0.010%, and the remainder is Fe and inevitable impurities, wherein tensile strength is 1200 MPa or more, and size of a long side of an A type inclusion is 250 mm or less in at least a cross-section in a longitudinal direction of a rail head, and the number of A type inclusions, each having a size of a long side of 1 mm to 250 mm, is less than 25 per observed area of 1 mm2 in the cross-section in the longitudinal direction of the rail head.Type: GrantFiled: March 16, 2007Date of Patent: March 26, 2013Assignee: JFE Steel CorporationInventors: Minoru Honjo, Tatsumi Kimura, Shinichi Suzuki, Nobuo Shikanai
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Patent number: 8361382Abstract: A steel rail including a composition of, in mass percent, C of 0.6% to 1.0%, Si of 0.1% to 1.5%, Mn of 0.4% to 2.0%, P of 0.035% or less, S of 0.010% or less, Ca of 0.0010% to 0.010%, and the remainder being Fe and inevitable impurities, wherein the tensile strength is 1200 MPa or more, and the size of a long side of a C type inclusion is 50 ?m or less in at least a cross-section in a longitudinal direction of a rail head, and the number of Ca type inclusions, each having a size of a long side of 1 ?m to 50 ?m, is 0.2 to 10 per observed area of 1 mm2 in the cross-section in the longitudinal direction of the rail head.Type: GrantFiled: November 18, 2011Date of Patent: January 29, 2013Assignee: JFE Steel CorporationInventors: Minoru Honjo, Tatsumi Kimura, Shinichi Suzuki, Nobuo Shikanai
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Publication number: 20120076685Abstract: A steel rail including a composition of, in mass percent, C of 0.6% to 1.0%, Si of 0.1% to 1.5%, Mn of 0.4% to 2.0%, P of 0.035% or less, S of 0.010% or less, Ca of 0.0010% to 0.010%, and the remainder being Fe and inevitable impurities, wherein the tensile strength is 1200 MPa or more, and the size of a long side of a C type inclusion is 50 ?m or less in at least a cross-section in a longitudinal direction of a rail head, and the number of Ca type inclusions, each having a size of a long side of 1 ?m to 50 ?m, is 0.2 to 10 per observed area of 1 mm2 in the cross-section in the longitudinal direction of the rail head.Type: ApplicationFiled: November 18, 2011Publication date: March 29, 2012Applicant: JFE STEEL CORPORATIONInventors: Minoru Honjo, Tatsumi Kimura, Shinichi Suzuki, Nobuo Shikanai
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Patent number: 7955445Abstract: An internal high hardness type pearlitic rail that has a composition containing 0.73% to 0.85% by mass C, 0.5% to 0.75% by mass Si, 0.3% to 1.0% by mass Mn, 0.035% by mass or less P, 0.0005% to 0.012% by mass S, 0.2% to 1.3% by mass Cr, and the balance being Fe and incidental impurities, in which the value of [% Mn]/[% Cr] is greater than or equal to 0.3 and less than 1.0, where [% Mn] represents the Mn content, and [% Cr] represents the Cr content, and in which the internal hardness of a rail head that is defined by the Vickers hardness of a portion located from a surface layer of the rail head to a depth of at least 25 mm is greater than or equal to 380 Hv and less than 480 Hv.Type: GrantFiled: March 25, 2008Date of Patent: June 7, 2011Assignee: JFE Steel CorporationInventors: Minoru Honjo, Tatsumi Kimura, Shinichi Suzuki, Kimihiro Nishimura, Shinji Mitao, Nobuo Shikanai
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Publication number: 20100186857Abstract: An internal high hardness type pearlitic rail has a composition containing 0.73% to 0.85% by mass C, 0.5% to 0.75% by mass Si, 0.3% to 1.0% by mass Mn, 0.035% by mass or less P, 0.0005% to 0.012% by mass S, 0.2% to 1.3% by mass Cr, 0.005% to 0.12% by mass V, 0.0015% to 0.0060% by mass N, and the balance being Fe and incidental impurities, wherein the value of [% Mn]/[% Cr] is greater than or equal to 0.3 and less than 1.0, where [% Mn] represents the Mn content, and [% Cr] represents the Cr content, and the value of [% V]/[% N] is in the range of 8.0 to 30.0, where [% V] represents the V content, and [% N] represents the N content, and wherein the internal hardness of a rail head is defined by the Vickers hardness of a portion located from a surface layer of the rail head to a depth of at least 25 mm and is greater than or equal to 380 Hv and less than 480 Hv.Type: ApplicationFiled: March 25, 2008Publication date: July 29, 2010Applicant: JFE STEEL CORPORATIONInventors: Minoru Honjo, Tatsumi Kimura, Shinichi Suzuki, Kimihiro Nishimura, Nobuo Shikanai
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Publication number: 20100116381Abstract: An internal high hardness type pearlitic rail that has a composition containing 0.73% to 0.85% by mass C, 0.5% to 0.75% by mass Si, 0.3% to 1.0% by mass Mn, 0.035% by mass or less P, 0.0005% to 0.012% by mass S, 0.2% to 1.3% by mass Cr, and the balance being Fe and incidental impurities, in which the value of [% Mn]/[% Cr] is greater than or equal to 0.3 and less than 1.0, where [% Mn] represents the Mn content, and [% Cr] represents the Cr content, and in which the internal hardness of a rail head that is defined by the Vickers hardness of a portion located from a surface layer of the rail head to a depth of at least 25 mm is greater than or equal to 380 Hv and less than 480 Hv.Type: ApplicationFiled: March 25, 2008Publication date: May 13, 2010Applicant: JFE STEEL CORPORATIONInventors: Minoru Honjo, Tatsumi Kimura, Shinichi Suzuki, Kimihiro Nishimura, Shinji Mitao, Nobuo Shikanai
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Patent number: 7692187Abstract: The present invention encompasses an organic field-effect transistor comprising an n-type organic semiconductor formed of a fullerene derivative having a fluorinated alkyl group which is expressed by the following chemical formula (wherein at least any one of R1, R2 and R3 is a perfluoro alkyl group or a partially-fluorinated semifluoro alkyl group each having a carbon number of 1 to 20), and a field-effect transistor production method comprising forming an organic semiconductor layer using the fullerene derivative by a solution process, and subjecting the organic semiconductor layer to a heat treatment in an atmosphere containing nitrogen or argon or in vacuum to provide enhanced characteristics to the organic semiconductor layer. The present invention makes it possible to form an organic semiconductor layer by a solution process and provide an organic field-effect transistor excellent in electron mobility and on-off ratio and capable of operating even in an ambient air atmosphere.Type: GrantFiled: March 20, 2007Date of Patent: April 6, 2010Assignee: National Institute of Advanced Industrial Science and TechnologyInventors: Masayuki Chikamatsu, Atsushi Itakura, Tatsumi Kimura, Satoru Shimada, Yuji Yoshida, Reiko Azumi, Kiyoshi Yase
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Publication number: 20090274572Abstract: The invention provides a high-strength pearlitic steel rail, which is inexpensive, and has a tensile strength of 1200 MPa or more, and is excellent in delayed fracture properties. Specifically, the rail contains, in mass percent, C of 0.6 to 1.0%, Si of 0.1 to 1.5%, Mn of 0.4 to 2.0%, P of 0.035% or less, S of 0.0005 to 0.010%, and the remainder is Fe and inevitable impurities, wherein tensile strength is 1200 MPa or more, and size of a long side of an A type inclusion is 250 mm or less in at least a cross-section in a longitudinal direction of a rail head, and the number of A type inclusions, each having a size of a long side of 1 mm to 250 mm, is less than 25 per observed area of 1 mm2 in the cross-section in the longitudinal direction of the rail head.Type: ApplicationFiled: March 16, 2007Publication date: November 5, 2009Applicant: JFE Steel CorporationInventors: Minoru Honjo, Tatsumi Kimura, Shinichi Suzuki, Nobuo Shikanai
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Publication number: 20070215872Abstract: The present invention encompasses an organic field-effect transistor comprising an n-type organic semiconductor formed of a fullerene derivative having a fluorinated alkyl group which is expressed by the following chemical formula (wherein at least any one of R1, R2 and R3 is a perfluoro alkyl group or a partially-fluorinated semifluoro alkyl group each having a carbon number of 1 to 20), and a field-effect transistor production method comprising forming an organic semiconductor layer using the fullerene derivative by a solution process, and subjecting the organic semiconductor layer to a heat treatment in an atmosphere containing nitrogen or argon or in vacuum to provide enhanced characteristics to the organic semiconductor layer. The present invention makes it possible to form an organic semiconductor layer by a solution process and provide an organic field-effect transistor excellent in electron mobility and on-off ratio and capable of operating even in an ambient air atmosphere.Type: ApplicationFiled: March 20, 2007Publication date: September 20, 2007Inventors: Masayuki Chikamatsu, Atsushi Itakura, Tatsumi Kimura, Satoru Shimada, Yuji Yoshida, Reiko Azumi, Kiyoshi Yase
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Patent number: 6706125Abstract: When manufacturing a straight steel section having a joint 2 comprising a ball claw 21 and a curved claw 20 by hot-rolling a bloom vertically symmetrically to make a section blank having a flange 2A at a web 1 end (first step), vertically asymmetrically hot-rolling the section blank to adjust the size of the web and form the flange into a rough joint 2B including a projection 20A (second step), and subjecting the projection to hot bend rolling into a curved claw 20 (third step), wherein the bloom has a chemical composition comprising, in mass percentage, from 0.01 to 0.20% C, up to 0.8% Si, up to 1.8% Mn, up to 0.030% P, and up to 0.020% S; and therein the claw bending start temperature in the third step is a temperature of over Ar3 or up to Ar3-50° C., thereby achieving a depth of wrinkle flaws 10 present on the inner surface side of the curved claw of up to 0.5 mm.Type: GrantFiled: May 6, 2002Date of Patent: March 16, 2004Assignee: JFE Steel CorporationInventors: Tatsumi Kimura, Yasushi Morikage, Keniti Amano, Takanori Okui, Keizou Taoka, Hironori Miura, Hiroyuki Ookubo, Fumimaru Kawabata
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Patent number: 6699338Abstract: A steel material excellent in weathering resistance by defining the chemical ingredients in the steel each to a predetermined range and setting an ingredient parameter formula in accordance with the working circumstance thereby reducing the flow rust and, particularly, forming stable rust with good protective property even in a salty circumstance such as in coast districts is provided. Further, also considering the amount of A type inclusions and B type inclusions according to JIS G 0555, a steel material of excellent earthquake proofness and weathering proofness also including weld heat affect zone is provided.Type: GrantFiled: September 9, 2002Date of Patent: March 2, 2004Assignee: JFE Steel CorporationInventors: Tatsumi Kimura, Kazuhiko Shiotani, Fumimaru Kawabata, Keniti Amano
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Publication number: 20030062101Abstract: A steel material excellent in weathering resistance by defining the chemical ingredients in the steel each to a predetermined range and setting an ingredient parameter formula in accordance with the working circumstance thereby reducing the flow rust and, particularly, forming stable rust with good protective property even in a salty circumstance such as in coast districts is provided.Type: ApplicationFiled: September 9, 2002Publication date: April 3, 2003Applicant: KAWASAKI STEEL CORPORATIONInventors: Tatsumi Kimura, Kazuhiko Shiotani, Fumimaru Kawabata, Keniti Amano
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Publication number: 20020192012Abstract: When manufacturing a straight steel section having a joint 2 comprising a ball claw 21 and a curved claw 20 by hot-rolling a bloom vertically symmetrically to make a section blank having a flange 2A at a web 1 end (first step), vertically asymmetrically hot-rolling the section blank to adjust the size of the web and form the flange into a rough joint 2B including a projection 20A (second step), and subjecting the projection to hot bend rolling into a curved claw 20 (third step), wherein the bloom has a chemical composition comprising, in mass percentage, from 0.01 to 0.20% C, up to 0.8% Si, up to 1.8% Mn, up to 0.030% P, and up to 0.020% S; and therein the claw bending start temperature in the third step is a temperature of over Ar3 or up to Ar3—50° C., thereby achieving a depth of wrinkle flaws 10 present on the inner surface side of the curved claw of up to 0.5 mm.Type: ApplicationFiled: May 6, 2002Publication date: December 19, 2002Inventors: Tatsumi Kimura, Yasushi Morikage, Keniti Amano, Takanori Okui, Keizou Taoka, Hironori Miura, Hiroyuki Ookubo, Fumimaru Kawabata
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Patent number: 6451134Abstract: The present invention relates to an H-shaped steel used as a building structure such as a column material or the like for highrise and super highrise building structures. In the bainite structure of extra-low-carbon steel, diffusive &agr;q is finely dispersed in &agr;B to ensure tensile strength at the 590-MPa level and significantly improve toughness in the direction of the flange thickness. Fine dispersion of &agr;q is achieved by controlling Mn and Cu in proper ranges. In other word, the present invention provides 590MPa class heavy gauge H-shaped steel with excellent as-rolled toughness in the direction of the flange thickness, containing 0.001 to 0.025 wt % of C, 0.6 wt % or less of Si, 0.4 to 1.6 wt % of Mn, 0.025 wt % or less of P, 0.010 wt % or less of S, 0.1 wt % or less of Al, 0.6 to 2.0 wt % of Cu, 0.25 to 2.0 wt % of Ni, 0.001 to 0.050 wt % of Ti, and 0.0002 to 0.0030 wt % of B, wherein Mn/Cu≦2.0 and 250≦117 Mn (wt %)+163 Cu (wt %)≦350 are satisfied.Type: GrantFiled: January 18, 2001Date of Patent: September 17, 2002Assignee: Kawasaki Steel CorporationInventors: Tatsumi Kimura, Fumimaru Kawabata, Keniti Amano
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Patent number: 6440235Abstract: Rolled H-shapes having high strength and high toughness, and which can be produced using cheaper alloy components than conventional products and which can be manufactured with a high productivity, are disclosed. A method for manufacturing the H-shapes is also disclosed. The rolled H-shapes include 0.03 to 0.1 wt. % of Nb and 0.005 to 0.04 wt. % of Ti. The method includes a rough universal rolling process in which an accumulated reduction at a rolling temperature of 950° C. or lower is 5% or larger, and reverse operation is conducted fast; and a finishing universal rolling, in which the rolling temperature is 750° C. or higher. Preferably, in the rough universal rolling, the accumulated reduction at a rolling temperature of 950° C. or lower is 50% or more.Type: GrantFiled: August 18, 2000Date of Patent: August 27, 2002Assignee: Kawasaki Steel CorporationInventors: Tatsumi Kimura, Fumimaru Kawabata, Keniti Amano
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Publication number: 20020034693Abstract: Disclosed is an improvement in an optical information recording method by utilizing a unique phenomenon in which, when a thin film of a polymeric compound having a structure of azobenzene is irradiated spotwise with a light beam of a specified wavelength, a pattern of rugged surface with recesses and raises is resulted by the migration of the polymer molecules from the strongly irradiated area to the weakly irradiated area. The improvement has an object to increase the photosensitivity of this phenomenon by simultaneously irradiating the polymeric thin film with a second or bias light beam of a larger cross section to envelop the irradiation spot by the first or writing light beam.Type: ApplicationFiled: December 21, 2000Publication date: March 21, 2002Inventors: Takashi Fukuda, Hiroo Matsuda, Kimio Sumaru, Tatsumi Kimura, Masao Kato
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Patent number: 6013748Abstract: Disclosed is a novel aromatic ester compound represented by the general formula ##STR1## in which Pn is a 1,4-phenylene group, R.sup.1 is an alkyl group having 1 to 4 carbon atoms, R.sup.2 is a group selected from the group consisting of perfluoroalkyl groups having 1 to 4 carbon atoms, cyano group, nitro group, 2,2-dicyanoethenyl group and methylsulfonyl group and the subscript n is a number of 2, 3 or 4. These aromatic ester compounds are useful as a second-order non-linear optical material in the ultraviolet wavelength range so that a resin film containing the compound has a good second-order non-linear optical coefficient d.sub.33 of 2-4.times.10.sup.-9 esu.Type: GrantFiled: March 24, 1998Date of Patent: January 11, 2000Assignee: Japan as represented by Director General of Agency of Industrial Science and TechnologyInventors: Hiroo Matsuda, Takashi Fukuda, Shinji Yamada, Tatsumi Kimura, Masao Kato, Xuan-Ming Duan, Shuji Okada, Hachiro Nakanishi
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Patent number: 6007644Abstract: A high-strength heavy-wall H-shaped steel is excellent in Z-direction toughness at the flange thickness center. The heavy-wall H-shaped steel is comprised of by weight from about 0.05 to 0.18% C, up to about 0.60% Si, from about 1.00% to about 1.80% Mn, up to about 0.020% P, under 0.004% S, from 0.016% to 0.050% Al, from 0.04% to 0. 15% V, and from 0.0070% to 0.0200% N, and one or more of from about 0.02% to about 0.60% Cu, from about 0.02% to about 0.60% Ni, from about 0.02% to about 0.50% Cr, and from about 0.01% to about 0.20% Mo; and the balance being Fe and incidental impurities. Also, (V.times.N)/S.gtoreq.0.150; the Ti content is within a range satisfying 0.002.ltoreq.Ti.ltoreq.1.38.times.N-8.59.times.10.sup.-4 ; Ceq (=C+Si/24+Mn/6+Ni/40+Cr/5+Mo/4+V/14) is within a range of from about 0.36 wt % to about 0.45 wt %, and the yield strength is at least 325 MPa.Type: GrantFiled: February 25, 1999Date of Patent: December 28, 1999Assignee: Kawasaki Steel CorporationInventors: Akio Ohmori, Tatsumi Kimura, Fumimaru Kawabata, Keniti Amano
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Patent number: 5882447Abstract: A heavy-wall steel having a flange thickness of about 40 mm or more and possessing excellent strength, toughness, weldability, and seismic resistance capable of being used for structure members such as columns and beams of high-rise buildings. The heavy-wall steel has a tensile strength of about 490-690 MPa, a yield ratio of about 80% or less, and Charpy absorbed energy at 0.degree. C. of about 27 J or more at the center in terms of thickness of the flange portion in each of the rolling direction, the direction perpendicular to the rolling direction, and the plate-thickness direction.Type: GrantFiled: December 30, 1997Date of Patent: March 16, 1999Assignee: Kawasaki Steel CorporationInventors: Tatsumi Kimura, Kiyoshi Uchida, Fumimaru Kawabata, Keniti Amano, Takanori Okui