Patents by Inventor Kengo Takeda
Kengo Takeda 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: 20230183834Abstract: Provided is a steel sheet having a predetermined chemical composition and microstructure, wherein a block size in a first depth region of 1 to 10 ?m from the surface is 5.0 ?m or less, a block size in a second depth region of 10 to 60 ?m from the surface is 6.0 to 20.0 ?m, and a block size in a third depth region of 60 ?m to 1/4 thickness from the surface is less than 6.0 ?m. Further, provided is a method for producing a steel sheet comprising a step of hot rolling a steel slab having a predetermined chemical composition, then coiling it at 500° C. or more, a step of pickling the hot rolled steel sheet to remove oxide scale, wherein an amount of removal of the surface layer of the hot rolled steel sheet is less than 5.00 ?m, a step of cold rolling by a rolling reduction of 30 to 90%, and an annealing step of holding in an atmosphere of a dew point of ?20 to 20° C. at a temperature region of 740 to 900° C. for 40 to 300 seconds.Type: ApplicationFiled: June 3, 2021Publication date: June 15, 2023Applicant: NIPPON STEEL CORPORATIONInventors: Kengo TAKEDA, Katsuya NAKANO, Yuya SUZUKI, Eriko TSUKAMOTO
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Patent number: 11635719Abstract: A fixing device 9 has a nozzle unit 9A. The nozzle unit 9A sprays the fixing solution to a sheet S on which a toner image is formed. The nozzle unit 9A has a housing 21, a nozzle electrode 23 and a plurality of nozzles 22. The plurality of nozzles 22 has a first nozzle 22A and a second nozzle 22B located at an interval from the first nozzle 22A in a first direction, and the nozzle electrode 23 is located inside the housing 21. The nozzle electrode 23 extends in the first direction. A length L1 of the nozzle electrode 23 in the first direction is greater than the interval between the first nozzle 22A and the second nozzle 22B in the first direction.Type: GrantFiled: September 28, 2021Date of Patent: April 25, 2023Assignee: Brother Kogyo Kabushiki KaishaInventors: Yutaka Kakigahara, Masamitsu Takahashi, Satoshi Murata, Kengo Takeda, Masataka Kamiya
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Publication number: 20230087014Abstract: The present invention provides steel sheet having both bendability and hydrogen embrittlement resistance. The steel sheet of the present invention includes a central part of sheet thickness and a surface sort part formed at one side or both sides of the central part of sheet thickness. The microstructure of the central part of sheet thickness comprises, by volume ratio, 60% or more of tempered martensite, respectively less than 30% of ferrite, bainite, pearlite, and retained austenite, and less than 5% of as-quenched martensite. A thickness of the surface soft part is more than 10 ?m per side and 15% or less of a thickness of the central part of sheet thickness, an average hardness of the surface soft part is 0.90 time or less of an average hardness of the central part of sheet thickness, the surface soft part includes carbides in a number density of 1×104/mm2 or more, an average particle size of the carbides is 0.250 ?m or less, and a standard deviation of a log of a particle size is 0.05 or less.Type: ApplicationFiled: March 16, 2020Publication date: March 23, 2023Applicant: NIPPON STEEL CORPORATIONInventors: Katsuya NAKANO, Kengo TAKEDA, Yuya SUZUKI
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Patent number: 11591675Abstract: Steel sheet low in cost and improved in fatigue characteristics without causing a drop in the cold formability, characterized in that it comprises an inner layer and a hard layer on one or both surfaces of the inner layer, a thickness of the hard layer is 20 ?m or more and 40% or less of the thickness of the steel sheet, an average micro-Vickers hardness of the hard layer is 240 HV or more and less than 400 HV, an amount of C of the hard layer is 0.4 mass % or less, an amount of N is 0.02 mass % or less, a variation of hardness measured by a nanoindenter at a depth of 10 from the surface of the hard layer is a standard deviation of 2.0 or less, an average micro-Vickers hardness of the inner layer is 80 HV or more and less than 400 HV, a volume rate of carbides contained in the inner layer is less than 2.00%, and the average micro-Vickers hardness of the hard layer is 1.05 times or more the average micro-Vickers hardness of the inner layer.Type: GrantFiled: February 20, 2018Date of Patent: February 28, 2023Assignee: NIPPON STEEL CORPORATIONInventors: Kengo Takeda, Riki Okamoto, Kazuo Hikida, Katsuya Nakano, Yuya Suzuki, Genki Abukawa
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Publication number: 20230059951Abstract: In the present invention, provided is a steel sheet having a predetermined chemical composition and a metallographic structure, in which A/B, which is a ratio of a length A of an interface between epitaxial ferrite and ferrite to a length B of an interface between the epitaxial ferrite and martensite in a cross section that is along a rolling direction and perpendicular to a surface of the steel sheet at a position of ¼ of a sheet thickness from the surface of the steel sheet is more than 1.5, a ratio of a major axis to a minor axis of the martensite is 5.0 or more, and a tensile strength is 980 MPa or more.Type: ApplicationFiled: January 12, 2021Publication date: February 23, 2023Applicant: NIPPON STEEL CORPORATIONInventors: Yuya SUZUKI, Kengo TAKEDA
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Publication number: 20230047282Abstract: A steel sheet includes a predetermined composition satisfying Expression (1), in which the microstructure at the ¼ thickness position from the surface in the sheet thickness direction includes, by vol %, ferrite: 95% or more and a remainder of the microstructure: 5% or less, has a proportion of unrecrystallized ferrite in the ferrite of 5% or less, and a half width w and an X-ray wavelength ? at a peak of (200) plane of the ferrite satisfy Expression (2). 0.80?{(Ti/48?N/14)+Nb/93}/(C/12)?5.00??(1) w×??0.Type: ApplicationFiled: December 21, 2020Publication date: February 16, 2023Applicant: NIPPON STEEL CORPORATIONInventors: Hiroyuki KAWATA, Kengo TAKEDA, Mai NAGANO
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Publication number: 20230041513Abstract: A steel sheet includes a predetermined composition, in which a microstructure at a ¼ thickness position from a surface in a sheet thickness direction includes, by vol %, ferrite: 80% or more, martensite: 2% or less, and residual austenite: 2% or less, a proportion of unrecrystallized ferrite in the ferrite of 5% or less, and in the microstructure of the steel sheet stretched by 10% at the ¼ thickness position from the surface in the sheet thickness direction, a number density of voids having a maximum diameter of 1.0 ?m or more is 1.0×109 pieces/m2 or less.Type: ApplicationFiled: December 21, 2020Publication date: February 9, 2023Applicant: NIPPON STEEL CORPORATIONInventors: Hiroyuki KAWATA, Kengo TAKEDA, Katsuya NAKANO
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Patent number: 11571903Abstract: There is provided a liquid discharge apparatus including: a head, a fixing device and a mist collector configured to collect a mist of a liquid. The mist collector and the fixing device are arranged side by side in this order in a first direction. The mist collector is provided with an air channel having a suction port and an exhaust port. The air channel has: a first part and a second part connected to an other end of the first part. The exhaust port is opened, in the second part, toward any one of directions which are: a direction including a direction opposite to the first direction as a directional component thereof, a third direction orthogonal to the first direction and a second direction, and a direction opposite to the third direction.Type: GrantFiled: June 28, 2021Date of Patent: February 7, 2023Assignee: Brother Kogyo Kabushiki KaishaInventors: Akihiro Kobayashi, Kengo Takeda, Takahiro Nishimoto
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Publication number: 20230027336Abstract: Provided is an evaporation apparatus configured to form an organic layer made from organic material on a substrate, the apparatus including: a container configured to contain the organic material, at least a portion of which is composed of conductor; a heating coil disposed around the container; a DC power supply; an inverter connected to the DC power supply; a primary coil connected to the inverter; and a secondary coil connected to the heating coil, wherein the primary coil and the secondary coil form a matching transformer.Type: ApplicationFiled: November 27, 2020Publication date: January 26, 2023Inventors: Shinichiro Kobayashi, Kengo Takeda, Hiroshi Miyazaki
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Patent number: 11555234Abstract: The present invention relates to steel sheet realizing both formability and weldability. The steel sheet of the present invention is characterized in that at a surface layer part of a region down to 30 ?m from the surface of the steel sheet in the sheet thickness direction, Si oxide grains are present in 3000 to 6000/mm2 in number density, an average of natural logarithms of the particle sizes of the Si oxide grains measured in ?m units is ?2.0 to ?1.2, the standard error of the natural logarithms of the particle sizes is 0.6 or less, and the number of Si oxide grains with deviations of the natural logarithms of the particle sizes from the average larger than 2 times the standard error is 5% or less of the total number of Si oxide grains and at a position of ½ of the thickness of the steel sheet, the number density of the Si oxide grains is 1000/mm2 or less.Type: GrantFiled: April 24, 2020Date of Patent: January 17, 2023Assignee: NIPPON STEEL CORPORATIONInventors: Yuya Suzuki, Kengo Takeda
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Publication number: 20230001711Abstract: A printer includes a platen, a first head, a second head, and an illumination device. In a normal print mode, the first head, the second head, and the illumination device are moved relatively with respect to the platen in a main scanning direction, in a state in which a distance between the platen and a predetermined position of the illumination device in the height direction is a first distance, and the ink is ejected onto an object to be printed placed on the platen and the light is irradiated onto the ejected ink. In a gloss print mode, the first head, the second head, and the illumination device are moved relatively with respect to the platen in the main scanning direction, in a state in which the distance between the platen and the predetermined position in the height direction is a second distance larger than the first distance.Type: ApplicationFiled: June 28, 2022Publication date: January 5, 2023Inventors: Kengo TAKEDA, Akihiro KOBAYASHI, Takahiro NISHIMOTO, Kosuke NUKUI, Kenta HASEBE
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Publication number: 20230001712Abstract: A printer includes a platen, a first head, a second head, a first lamp, and a second lamp. The first head, the second head, the first lamp, and the second lamp are moved relatively with respect to the platen in a main scanning direction, and the platen is moved from the second head toward the first head relatively with respect to the first head, the second head, the first lamp, and the second lamp, repeatedly. The second head ejects the second ink onto the object to be printed placed on the platen while the first head, the second head, the first lamp, and the second lamp are moving in the main scanning direction. The first lamp irradiates light onto the second ink on the object to be printed while the first head, the second head, the first lamp, and the second lamp are moving in the main scanning direction.Type: ApplicationFiled: June 28, 2022Publication date: January 5, 2023Inventors: Akihiro KOBAYASHI, Takahiro NISHIMOTO, Kosuke NUKUI, Kenta HASEBE, Kengo TAKEDA
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Publication number: 20230002846Abstract: This steel sheet has a specific chemical composition, the tensile strength is 1300 MPa or more, the ratio (R/t) of the limit bend radius to the sheet thickness is less than 3.5, when a depth position of 30 ?m from the surface in the sheet thickness direction is defined as a position A and a depth position of ¼ of the sheet thickness from the surface in the sheet thickness direction is defined as a position B, the number density of AIN at the position A is 3000 pieces/mm2 or more and 6000 pieces/mm2 or less, a metallographic structure at the position B includes 90% or more of martensite by volume percentage, and the hardness at the position A is 1.20 times or higher than the hardness at the position B.Type: ApplicationFiled: December 17, 2020Publication date: January 5, 2023Applicant: NIPPON STEEL CORPORATIONInventors: Yuya SUZUKI, Kengo TAKEDA
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Publication number: 20220389531Abstract: A steel sheet has a predetermined chemical composition, in which a microstructure in a ¼ width portion, a microstructure in a ½ width portion, and a microstructure in a ¾ width portion, include, by area %, ferrite: 80% or more, martensite: 2% or less, and residual austenite: 2% or less, in which a proportion of unrecrystallized ferrite in the ferrite is 5% to 60%, an average grain size of carbonitrides is 6.0 nm to 30.0 nm, and Expressions (2) to (5) are satisfied. ?SF/?SF?0.10??(2) ?dF/?dF?0.20??(3) ?SUF?20??(4) ?dC/?dC?0.Type: ApplicationFiled: January 4, 2021Publication date: December 8, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Hiroyuki KAWATA, Kengo TAKEDA, Eriko TSUKAMOTO
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Patent number: 11472159Abstract: A high strength steel sheet comprising a center part of sheet thickness and a surface soft part formed at one side or two sides of the center part of sheet thickness, having metal structures of the center part of sheet thickness comprising, by area ratio, tempered martensite: 85% or more, one or more of ferrite, bainite, pearlite, and retained austenite: total of less than 15%, and as-quenched martensite: less than 5%, and additionally having metal structures of the surface soft part comprising, by area ratio, ferrite: 65% or more, pearlite: 5% or more and less than 20%, one or more of tempered martensite, bainite, and retained austenite: total of less than 10%, and as-quenched martensite: less than 5%, wherein a Vickers hardness (Hc) of the center part of sheet thickness and a Vickers hardness (Hs) of the surface soft part satisfy 0.50?Hs/Hc?0.75.Type: GrantFiled: March 16, 2020Date of Patent: October 18, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Katsuya Nakano, Kengo Takeda, Hiroyuki Kawata
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Publication number: 20220314661Abstract: A movable assembly configured to move a table in a first direction is provided. The movable assembly includes a first link member including a first elongated member and a second elongated member coupled in an X formation, a second link member including a third elongated member and a fourth elongated member coupled in the X formation, a first frame member, a second frame member, and a rotatable member being a threaded rod. The first frame member includes a first supporting portion and a first guiding portion, which support ends of the first, second, third, and fourth elongated members on one side rotatably. The second frame member includes a second supporting portion and a second guiding portion, which support other ends of the first, second, third, and fourth elongated members located on the other side movably in the third direction.Type: ApplicationFiled: March 31, 2022Publication date: October 6, 2022Inventors: Akihiro KOBAYASHI, Kengo TAKEDA, Takayuki AKIMATSU, Takahiro NISHIMOTO
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Publication number: 20220290269Abstract: This steel sheet has a predetermined chemical composition, the metallographic structure includes, by an area ratio, ferrite, bainite and pearlite: 0 to 10% in total, residual austenite: 1 to 15%, and a remainder that is martensite, and a proportion of martensite or residual austenite having a width of 50 nm to 2 ?m present at a prior austenite grain boundary is 70% or more.Type: ApplicationFiled: October 9, 2020Publication date: September 15, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Eriko TSUKAMOTO, Kengo TAKEDA
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Publication number: 20220282351Abstract: Provided are: a steel sheet having a high strength and excellent hydrogen embrittlement resistance; and a method of producing the same. The steel sheet has prescribed chemical composition and structure, in which a standard deviation ? of Mn concentration satisfies ??0.15 Mnave (wherein, Mnave represents an average Mn concentration) and a region with a Mn concentration of higher than (Mnave+1.3?) has a circle-equivalent diameter of less than 10.0 ?m. The method of producing the steel sheet includes: the hot rolling step that includes finish rolling a slab having a prescribed chemical composition under prescribed conditions; the step of coiling the thus obtained hot-rolled steel sheet at a coiling temperature of 450 to 700° C.; and the step of cold rolling the hot-rolled steel sheet and subsequently annealing this steel sheet at 800 to 900° C.Type: ApplicationFiled: March 12, 2020Publication date: September 8, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Kengo TAKEDA, Hiroyuki KAWATA, Takafumi YOKOYAMA, Katsuya NAKANO
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Publication number: 20220267874Abstract: A steel sheet having a tensile strength of 1100 MPa or more and excellent in crash resistance, having a micro-structure containing tempered martensite: 95 vol. % or more, wherein in a cross section parallel to a sheet-thickness direction of the steel sheet, when a sheet thickness is denoted by t, in a 300-?m-square region centered about a t/2 point, a standard deviation of Vickers hardnesses that are measured under a load of 9.8 N at 30 points is 30 or less, wherein when a 100-?m-square region centered about a t/2 point is divided into 10×10, 100 subregions, and at a center of each of the subregions, a nano hardness is measured under a maximum load of 1 mN, out of the subregions, the number of subregions each of which makes a difference in nano hardness of 3 GPa or more from any one of eight surrounding subregions is 10 or less.Type: ApplicationFiled: June 26, 2020Publication date: August 25, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Katsuya NAKANO, Kengo TAKEDA, Hiroyuki KAWATA, Akihiro UENISHI, Yuya SUZUKI
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Patent number: 11408045Abstract: There is provided a steel sheet including an inner layer and a hard layer formed on one or both surfaces of the inner layer, wherein each content of C and Mn in the hard layer is more than each content of C and Mn in the inner layer, a thickness of the hard layer is 20 ?m or more and a total of the thickness of the hard layer is ? or less of the entire sheet thickness, an average micro-Vickers hardness of the hard layer is 400 HV or more and less than 800 HV, an average micro-Vickers hardness of the inner layer is 350 HV or more and is 50 HV or more smaller than a hardness of the hard layer, and a screw dislocation density of the inner layer is 2.0×1013 m/m3 or more.Type: GrantFiled: February 20, 2018Date of Patent: August 9, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Kengo Takeda, Riki Okamoto, Kazuo Hikida, Katsuya Nakano, Yuya Suzuki, Genki Abukawa