Patents by Inventor Naoki Saitoh
Naoki Saitoh 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: 20190226066Abstract: A steel plate according to an aspect of the present invention has a predetermined chemical composition, an index Q obtained by Equation (1) is 0.00 or more, a carbon equivalent Ceq (%) obtained by Equation (2) is less than 0.800%, a ratio of a difference between a hardness at a surface layer portion and a hardness at a thickness center portion to the hardness at the surface layer portion at a room temperature is 15.0% or less, the hardness at the suffice layer portion at a room temperature is 400 or more in terms of Vickers hardness, and a steel thickness is 40 or more. Q=0.18?1.3(logT)+0.75(2.7×[C]+[Mn]+0.45×[Ni]+0.Type: ApplicationFiled: February 27, 2018Publication date: July 25, 2019Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Mitsuru SAWAMURA, Naoki SAITOH, Yasunori TAKAHASHI, Takumi MIYAKE, Norimasa KAWABATA, Takeshi TSUZUKI
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Patent number: 9499873Abstract: In a steel plate according to the present invention, a chemical composition is within a predetermined range, an ? value is 0.13 to 1.0 mass %, a ? value is 8.45 to 15.2, an yield strength is 670 to 870 N/mm2, a tensile strength is 780 to 940 N/mm2, an average grain size at ½t of the steel plate is 35 ?m or less, and a plate thickness is 25 to 200 mm. In the steel plate according to the present invention, in a case where SR is performed on the steel, a charpy absorbed energy at ?40° C. in an area in which SR is performed may be 100 J or more.Type: GrantFiled: December 3, 2013Date of Patent: November 22, 2016Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Naoki Saitoh, Mitsuru Sawamura, Katsumi Kurebayashi, Yasunori Takahashi, Takumi Miyake
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Patent number: 9308756Abstract: An image forming apparatus includes an apparatus body, a sheet feeder to load a roll body including a recording medium wound around, an image forming unit to form an image on the recording medium, and a conveyance unit including a conveyance belt to convey the recording medium drawn out from the roll body so as to oppose the recording medium to the image forming unit. The sheet feeder and the conveyance unit are integrated as a sheet feed conveyance unit. The sheet feed conveyance unit is configured to load the roll body in at least the sheet feeder and be drawable from the apparatus body to a position at which the conveyance belt is visible.Type: GrantFiled: October 2, 2013Date of Patent: April 12, 2016Assignee: RICOH COMPANY, LTD.Inventors: Kazuyoshi Matsumoto, Makoto Kikura, Kazuyoshi Kondo, Yuuzoh Obata, Norikazu Yanase, Yoshinori Uchino, Gaku Hosono, Tohru Watanabe, Toshihisa Nakamura, Tadashi Okano, Naoki Saitoh
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Patent number: 9260771Abstract: A Ni-added steel plate includes, by mass %, C: 0.04% to 0.10%, Si: 0.02% to 0.12%, Mn: 0.3% to 1.0%, Ni: more than 7.5% to 10.0%, Al: 0.01% to 0.08%, T.O: 0.0001% to 0.0030%, P: limited to 0.0100% or less, S: limited to 0.0035% or less, N: limited to 0.0070% or less, and the balance consisting of Fe and unavoidable impurities, in which a Ni segregation ratio at an area of ¼ of a plate thickness away from a plate surface in a thickness direction is 1.3 or less, a fraction of austenite after a deep cooling is 0.5% or more, an austenite unevenness index after the deep cooling is 3.0 or less, and an average equivalent circle diameter of the austenite after the deep cooling is 1 ?m or less.Type: GrantFiled: September 28, 2011Date of Patent: February 16, 2016Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Hitoshi Furuya, Naoki Saitoh, Motohiro Okushima, Yasunori Takahashi
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Patent number: 9126795Abstract: An image forming apparatus includes an output unit, a pair of output rotary bodies, and a controller. A sheet having an image formed thereon is discharged to the output unit. When plural sheets are sequentially discharged to the output unit, the controller controls overlapping output operation to, with a trailing end portion of a preceding sheet of the plural sheets being held by the pair of output rotary bodies, feed a subsequent sheet of the sheets to between the pair of output rotary bodies to overlap a leading end portion of the subsequent sheet with the trailing end portion of the preceding sheet. With the leading end portion of the subsequent sheet overlapped with the trailing end portion of the preceding sheet, the controller controls the pair of output rotary bodies to rotate to discharge the preceding sheet to the output unit.Type: GrantFiled: March 10, 2014Date of Patent: September 8, 2015Assignee: RICOH COMPANY, LTD.Inventors: Naoki Saitoh, Tomomi Katoh, Hiroshi Noda, Yuta Moriwaki
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Publication number: 20150247214Abstract: In a steel plate according to the present invention, a chemical composition is within a predetermined range, an ? value is 0.13 to 1.0 mass %, a ? value is 8.45 to 15.2, an yield strength is 670 to 870 N/mm2, a tensile strength is 780 to 940 N/mm2, an average grain size at ½t of the steel plate is 35 ?m or less, and a plate thickness is 25 to 200 mm. In the steel plate according to the present invention, in a case where SR is performed on the steel, a charpy absorbed energy at ?40° C. in an area in which SR is performed may be 100 J or more.Type: ApplicationFiled: December 3, 2013Publication date: September 3, 2015Inventors: Naoki Saitoh, Mitsuru Sawamura, Katsumi Kurebayashi, Yasunori Takahashi, Takumi Miyake
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Patent number: 8992006Abstract: An image forming apparatus includes an image forming unit forming an image on a recording medium; and a feeding unit feeding the recording medium in first and second directions opposite to each other relative to the image forming unit. Further when the recording medium is supplied from a first or second side of the feeding unit, while the feeding unit feeds the recording medium in the first or second feeding direction, the image forming unit forms an image on the recording medium, and the feeding unit further feeds the recording medium to the second or first side, respectively, of the feeding unit.Type: GrantFiled: September 13, 2013Date of Patent: March 31, 2015Assignee: Ricoh Company, Ltd.Inventors: Yoichi Ito, Mikio Ohashi, Fumitaka Kikkawa, Naoki Saitoh, Soyoung Park, Yoshinori Uchino
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Patent number: 8882936Abstract: The present invention provides a high-tensile steel material having a tensile strength of the 550 MPa class or more which can simultaneously raise the strength and toughness of the heat affected zone of weld to equal those of the matrix and a method of production of the same, that is, a high-tensile steel material with excellent weldability and toughness and with tensile strength of the 550 MPa class or more containing, by mass %, C: 0.005 to 0.10%, W: 0.10 to 3.0%, Nb: 0.010 to 0.080%, and V: 0.010 to 0.50%, limiting the Ti to less than 0.005%, satisfying equation; EC=2[C]?[Nb]/9?[V]/12>0.020, having an amount of precipitation of W contained in the steel material, in terms of analytical value obtained by quantitative analysis of potential electrolysis extraction residue by fluorescent X-ray analysis, of 0.0050% or less, and having 60% or more of its structural composition in a cross-section of the steel as a bainite structure.Type: GrantFiled: May 2, 2005Date of Patent: November 11, 2014Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Yasushi Hasegawa, Naoki Saitoh, Youichi Tanaka
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Patent number: 8882942Abstract: A Ni-added steel plate contains, by mass %, C: 0.03% to 0.10%, Si: 0.02% to 0.40%, Mn: 0.3% to 1.2%, Ni: 5.0% to 7.5%, Cr: 0.4% to 1.5%, Mo: 0.02% to 0.4%, Al: 0.01% to 0.08%, T.O: 0.0001% to 0.0050%, P: limited to 0.0100% or less, S: limited to 0.0035% or less, and N: limited to 0.0070% or less with a remainder composed of Fe and inevitable impurities, in which a Ni segregation ratio at a position of ¼ of a plate thickness away from a plate surface in a thickness direction is 1.3 or less, a fraction of austenite after deep cooling is 2% or more, an austenite unevenness index after deep cooling is 5.0 or less, and an average equivalent circle diameter of austenite after deep cooling is 1 ?m or less.Type: GrantFiled: July 7, 2011Date of Patent: November 11, 2014Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Hitoshi Furuya, Naoki Saitoh, Motohiro Okushima, Yasunori Takahashi, Takehiro Inoue, Ryuji Uemori
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Publication number: 20140265106Abstract: An image forming apparatus includes an output unit, a pair of output rotary bodies, and a controller. A sheet having an image formed thereon is discharged to the output unit. When plural sheets are sequentially discharged to the output unit, the controller controls overlapping output operation to, with a trailing end portion of a preceding sheet of the plural sheets being held by the pair of output rotary bodies, feed a subsequent sheet of the sheets to between the pair of output rotary bodies to overlap a leading end portion of the subsequent sheet with the trailing end portion of the preceding sheet. With the leading end portion of the subsequent sheet overlapped with the trailing end portion of the preceding sheet, the controller controls the pair of output rotary bodies to rotate to discharge the preceding sheet to the output unit.Type: ApplicationFiled: March 10, 2014Publication date: September 18, 2014Applicant: RICOH COMPANY. LTD.Inventors: Naoki Saitoh, Tomomi KATOH, Hiroshi NODA, Yuta MORIWAKI
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Publication number: 20140158258Abstract: A Ni-added steel plate includes, by mass %, C: 0.04% to 0.10%, Si: 0.02% to 0.12%, Mn: 0.3% to 1.0%, Ni: more than 7.5% to 10.0%, Al: 0.01% to 0.08%, T.O: 0.0001% to 0.0030%, P: limited to 0.0100% or less, S: limited to 0.0035% or less, N: limited to 0.0070% or less, and the balance consisting of Fe and unavoidable impurities, in which a Ni segregation ratio at an area of ¼ of a plate thickness away from a plate surface in a thickness direction is 1.3 or less, a fraction of austenite after a deep cooling is 0.5% or more, an austenite unevenness index after the deep cooling is 3.0 or less, and an average equivalent circle diameter of the austenite after the deep cooling is 1 ?m or less.Type: ApplicationFiled: September 28, 2011Publication date: June 12, 2014Inventors: Hitoshi Furuya, Naoki Saitoh, Motohiro Okushima, Yasunori Takahashi
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Publication number: 20140099150Abstract: An image forming apparatus includes an apparatus body, a sheet feeder to load a roll body including a recording medium wound around, an image forming unit to form an image on the recording medium, and a conveyance unit including a conveyance belt to convey the recording medium drawn out from the roll body so as to oppose the recording medium to the image forming unit. The sheet feeder and the conveyance unit are integrated as a sheet feed conveyance unit. The sheet feed conveyance unit is configured to load the roll body in at least the sheet feeder and be drawable from the apparatus body to a position at which the conveyance belt is visible.Type: ApplicationFiled: October 2, 2013Publication date: April 10, 2014Applicant: RICOH COMPANY, LTD.Inventors: Kazuyoshi Matsumoto, Makoto Kikura, Kazuyoshi Kondo, Yuuzoh Obata, Norikazu Yanase, Yoshinori Uchino, Gaku Hosono, Tohru Watanabe, Toshihisa Nakamura, Tadashi Okano, Naoki Saitoh
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Publication number: 20140078231Abstract: An image forming apparatus includes an image forming unit forming an image on a recording medium; and a feeding unit feeding the recording medium in first and second directions opposite to each other relative to the image forming unit. Further when the recording medium is supplied from a first or second side of the feeding unit, while the feeding unit feeds the recording medium in the first or second feeding direction, the image forming unit forms an image on the recording medium, and the feeding unit further feeds the recording medium to the second or first side, respectively, of the feeding unit.Type: ApplicationFiled: September 13, 2013Publication date: March 20, 2014Applicant: RICOH COMPANY, LTD.Inventors: Yoichi Ito, Mikio Ohashi, Fumitaka Kikkawa, Naoki Saitoh, Soyoung Park, Yoshinori Uchino
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Publication number: 20130098514Abstract: A Ni-added steel plate contains, by mass %, C: 0.03% to 0.10%, Si: 0.02% to 0.40%, Mn: 0.3% to 1.2%, Ni: 5.0% to 7.5%, Cr: 0.4% to 1.5%, Mo: 0.02% to 0.4%, Al: 0.01% to 0.08%, T•O: 0.0001% to 0.0050%, P: limited to 0.0100% or less, S: limited to 0.0035% or less, and N: limited to 0.0070% or less with a remainder composed of Fe and inevitable impurities, in which a Ni segregation ratio at a position of ¼ of a plate thickness away from a plate surface in a thickness direction is 1.3 or less, a fraction of austenite after deep cooling is 2% or more, an austenite unevenness index after deep cooling is 5.0 or less, and an average equivalent circle diameter of austenite after deep cooling is 1 ?m or less.Type: ApplicationFiled: July 7, 2011Publication date: April 25, 2013Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Hitoshi Furuya, Naoki Saitoh, Motohiro Okushima, Yasunori Takahashi, Takehiro Inoue, Ryuji Uemori
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Patent number: 8097099Abstract: The present invention provides an abrasion resistant steel having a hardness of HB400 to HB520, having little change of hardness during long term use, and superior in toughness, characterized by containing, by mass %, C: 0.21% to 0.30%, Si: 0.30 to 1.00%, Mn: 0.32 to 0.70%, P: 0.02% or less, S: 0.01% or less, Cr: 0.1 to 2.0%, Mo: 0.1 to 1.0%, B: 0.0003 to 0.0030%, Al: 0.01 to 0.1%, and N: 0.01% or less, further containing one or more of V: 0.01 to 0.1%, Nb: 0.005 to 0.05%, Ti: 0.005 to 0.03%, Ca: 0.0005 to 0.05%, Mg: 0.0005 to 0.05%, and REM: 0.001 to 0.Type: GrantFiled: August 18, 2006Date of Patent: January 17, 2012Assignee: Nippon Steel CorporationInventors: Naoki Saitoh, Tatsuya Kumagai, Katsumi Kurebayashi, Hirohide Muraoka
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Publication number: 20110217566Abstract: Corrosion-resistant steel for chimney/flue use in natural gas-fired or liquefied petroleum gas-fired plants, containing C: 0.005% to 0.030%, Si: 0.18% to 0.50%, Mn: 1.50% to less than 3.00, P: 0.030% or less, S: 0.0050% or less, Cr: 4.0% to 9.0%, Al: 0.20% to 1.50%, and N: 0.020% or less and able to prevent advanced pitting or other localized corrosion and the resultant hole formation and rust aerial dispersal is provided.Type: ApplicationFiled: March 19, 2010Publication date: September 8, 2011Inventors: Matoko Nagasawa, Kenji Katoh, Naoki Saitoh, Masayuki Kodama, Mutsuto Tanaka, Fumiaki Nakamura
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Patent number: 7967923Abstract: The present invention provides a steel plate that exhibits excellent low-temperature toughness in a base material and a weld heat-affected zone and has small strength anisotropy, wherein the steel includes, by mass, C: 0.04%-0.10%; Si: 0.02%-0.40%; Mn: 0.5%-1.0%; P: 0.0010%-0.0100%; S: 0.0001%-0.0050%; Ni: 2.0%-4.5%; Cr: 0.1%-1.0%; Mo: 0.1%-0.6%; V: 0.005%-0.1%; Al: 0.01%-0.08%; and N: 0.0001%-0.0070%, with the balance including Fe and inevitable impurities, a Ni segregation ratio at a portion located at one-fourth of a thickness of the steel plate in a steel-plate thickness direction from a surface of the steel plate is 1.3 or lower, a degree of flatness of a prior austenite grain is in a range from 1.05 to 3.0, an effective diameter of crystal grain is 10 ?m or lower, and a Vickers hardness number is in a range of 265 HV to 310 HV.Type: GrantFiled: October 1, 2009Date of Patent: June 28, 2011Assignee: Nippon Steel CorporationInventors: Hitoshi Furuya, Naoki Saitoh, Motohiro Okushima, Yasunori Takahashi
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Publication number: 20110129381Abstract: The present invention provides a high-tensile steel material having a tensile strength of the 550 MPa class or more which can simultaneously raise the strength and toughness of the heat affected zone of weld to equal those of the matrix and a method of production of the same, that is, a high-tensile steel material with excellent weldability and toughness and with tensile strength of the 550 MPa class or more containing, by mass %, C: 0.005 to 0.10%, W: 0.10 to 3.0%, Nb: 0.010 to 0.080%, and V: 0.010 to 0.50%, limiting the Ti to less than 0.005%, satisfying equation; EC=2[C]?[Nb]/9?[V]/12>0.020, having an amount of precipitation of W contained in the steel material, in terms of analytical value obtained by quantitative analysis of potential electrolysis extraction residue by fluorescent X-ray analysis, of 0.0050% or less, and having 60% or more of its structural composition in a cross-section of the steel as a bainite structure.Type: ApplicationFiled: May 2, 2005Publication date: June 2, 2011Applicant: NIPON STEEL CORPORATIONInventors: Yasushi Hasegawa, Naoki Saitoh, Youichi Tanaka
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Publication number: 20110036469Abstract: The present invention provides a steel plate that exhibits excellent low-temperature toughness in a base material and a weld heat-affected zone and has small strength anisotropy, wherein the steel includes, by mass, C: 0.04%-0.10%; Si: 0.02%-0.40%; Mn: 0.5%-1.0%; P: 0.0010%-0.0100%; S: 0.0001%-0.0050%; Ni: 2.0%-4.5%; Cr: 0.1%-1.0%; Mo: 0.1%-0.6%; V: 0.005%-0.1%; Al: 0.01%-0.08%; and N: 0.0001%-0.0070%, with the balance including Fe and inevitable impurities, a Ni segregation ratio at a portion located at one-fourth of a thickness of the steel plate in a steel-plate thickness direction from a surface of the steel plate is 1.3 or lower, a degree of flatness of a prior austenite grain is in a range from 1.05 to 3.0, an effective diameter of crystal grain is 10 ?m or lower, and a Vickers hardness number is in a range of 265 HV to 310 HV.Type: ApplicationFiled: October 1, 2009Publication date: February 17, 2011Inventors: Hitoshi Furuya, Naoki Saitoh, Motohiro Okushima, Yasunori Takahashi
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Publication number: 20100139820Abstract: This wear-resistant steel plate includes, in terms of mass %, C: not less than 0.13% and not more than 0.18%, Si: not less than 0.5% but less than 1.0%, Mn: not less than 0.2% and not more than 0.8%, P: not more than 0.020%, S: not more than 0.010%, Cr: not less than 0.5% and not more than 2.0%, Mo: not less than 0.03% and not more than 0.30%, Nb: more than 0.03% but not more than 0.10%, Al: not less than 0.01% and not more than 0.20%, B: not less than 0.0005% and not more than 0.0030%, and N: not more than 0.010%, with a remainder being Fe and unavoidable impurities, wherein an element composition is such that HI is 0.7 or greater and Ceq exceeds 0.50, and an HB value (Brinell hardness) at 25° C. is not less than 360 and not more than 440.Type: ApplicationFiled: January 6, 2009Publication date: June 10, 2010Inventors: Tatsuya Kumagai, Naoki Saitoh