Patents by Inventor Tomofumi Shigekuni
Tomofumi Shigekuni 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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Patent number: 9534136Abstract: A semi-organic insulation coating includes an inorganic component and an organic resin, a Zr compound and an Si compound contains a plate-like silica as an inorganic component and are included in a ratio in a dry coating of 20 to 70 mass % of Zr compound (converted to ZrO2) and 10 to 50 mass % of Si compound containing plate-like silica (converted to SiO2), and the remainder is substantially an organic resin, whereby a magnetic steel sheet with a semi-organic insulation coating has no deterioration of corrosion resistance and water resistance without containing a chromium compound and being excellent in powdering resistance, scratch resistance, sticking resistance, TIG weldability, punchability and coating appearance.Type: GrantFiled: July 21, 2011Date of Patent: January 3, 2017Assignee: JFE Steel CorporationInventors: Kazumichi Sashi, Hiroyuki Ogata, Chiyoko Tada, Nobuko Nakagawa, Nobue Fujibayashi, Tomofumi Shigekuni, Kenichi Sasaki
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Patent number: 9011585Abstract: A treatment solution for an insulation coating of grain-oriented electrical steel sheets includes at least one selected from phosphates of Mg, Ca, Ba, Sr, Zn, Al and Mn; colloidal silica in a proportion of 0.5 to 10 mol in terms of SiO2; and a water-soluble vanadium compound in a proportion of 0.1 to 2.0 mol in terms of V, relative to PO4:1 mol in the phosphates.Type: GrantFiled: May 15, 2014Date of Patent: April 21, 2015Assignee: JFE Steel CorporationInventors: Mineo Muraki, Minoru Takashima, Tomofumi Shigekuni
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Publication number: 20150044475Abstract: The present invention includes an electrical steel sheet with an insulation coating having a large interlaminar insulation resistance when laminated; a coating material for forming the insulation coating that is used for the electrical steel sheet and the coating material for forming the insulation coating, which includes apart from a solvent an aqueous carboxy group-containing resin as component (A), an aluminum-containing oxide as component (B), and at least one crosslinking agent as component (C) selected from the group consisting of melamine, isocyanate and oxazoline. There are component (A); 100 parts by mass; 40 parts by mass<component (B)<150 parts by mass; 20 parts by mass<component (C)<100 parts by mass.Type: ApplicationFiled: February 25, 2013Publication date: February 12, 2015Applicants: JFE STEEL CORPORATION, DAI NIPPON TORYO CO., LTD.Inventors: Nobuko Nakagawa, Tomofumi Shigekuni, Takahiro Kubota, Osamu Tanida
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Publication number: 20140245926Abstract: A treatment solution for an insulation coating of grain-oriented electrical steel sheets includes at least one selected from phosphates of Mg, Ca, Ba, Sr, Zn, Al and Mn; colloidal silica in a proportion of 0.5 to 10 mol in terms of SiO2; and a water-soluble vanadium compound in a proportion of 0.1 to 2.0 mol in terms of V, relative to PO4:1 mol in the phosphates.Type: ApplicationFiled: May 15, 2014Publication date: September 4, 2014Applicant: JFE Steel CorporationInventors: Mineo Muraki, Minoru Takashima, Tomofumi Shigekuni
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Patent number: 8771795Abstract: A treatment solution for insulation coating for grain-oriented electrical steel sheets contains at least one selected from phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn; colloidal silica in a proportion of 0.5 to 10 mol in terms of SiO2 and a water-soluble vanadium compound in a proportion of 0.1 to 2.0 mol in terms of V, relative to PO4:1 mol in the phosphates.Type: GrantFiled: July 30, 2008Date of Patent: July 8, 2014Assignee: JFE Steel CorporationInventors: Mineo Muraki, Minoru Takashima, Tomofumi Shigekuni
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Patent number: 8535455Abstract: A treatment solution for an insulation coating for a grain oriented electrical steel sheet includes at least one member selected from phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn, and colloidal silica in a proportion of 0.5 to 10 mol in terms of SiO2 and at least one member selected from permanganates of Mg, Sr, Zn, Ba, and Ca in a proportion of 0.02 to 2.5 mol in terms of metal elements in the permanganates, relative to PO4:1 mol in the phosphates.Type: GrantFiled: August 20, 2008Date of Patent: September 17, 2013Assignee: JFE Steel CorporationInventors: Minoru Takashima, Mineo Muraki, Makoto Watanabe, Tomofumi Shigekuni
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Publication number: 20130115444Abstract: A semi-organic insulation coating includes an inorganic component and an organic resin, a Zr compound and an Si compound contains a plate-like silica as an inorganic component and are included in a ratio in a dry coating of 20 to 70 mass % of Zr compound (converted to ZrO2) and 10 to 50 mass % of Si compound containing plate-like silica (converted to SiO2), and the remainder is substantially an organic resin, whereby a magnetic steel sheet with a semi-organic insulation coating has no deterioration of corrosion resistance and water resistance without containing a chromium compound and being excellent in powdering resistance, scratch resistance, sticking resistance, TIG weldability, punchability and coating appearance.Type: ApplicationFiled: July 21, 2011Publication date: May 9, 2013Applicant: JFE STEEL CORPORATIONInventors: Kazumichi Sashi, Hiroyuki Ogata, Chiyoko Tada, Nobuko Nakagawa, Nobue Fujibayashi, Tomofumi Shigekuni, Kenichi Sasaki
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Patent number: 8409370Abstract: A treatment solution for insulation coating for grain oriented electrical steel sheet includes at least one member selected from phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn, and colloidal silica in a proportion of 0.2 to 10 mol in terms of SiO2 and a titanium chelate compound in a proportion of 0.01 to 4.0 mol in terms of Ti, relative to PO4: 1 mol in the phosphates.Type: GrantFiled: August 28, 2008Date of Patent: April 2, 2013Assignee: JFE Steel CorporationInventors: Minoru Takashima, Mineo Muraki, Makoto Watanabe, Tomofumi Shigekuni
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Publication number: 20120301744Abstract: An electrical steel sheet is provided with an insulating coating which has inorganic with some organic materials, the insulating coating including inorganic components and an organic resin, the insulating coating contains, as the inorganic components, a Zr compound, a B compound, and a Si compound, specifically, when expressed as percentages in the dry coating, 20% to 70% by mass of the Zr compound (in terms of ZrO2), 0.1% to 5% by mass of the B compound (in terms of B2O3), and 10% to 50% by mass of the Si compound (in terms of SiO2), and the balance containing the organic resin.Type: ApplicationFiled: November 5, 2010Publication date: November 29, 2012Applicant: JFE Steel CorporationInventors: Kazumichi Sashi, Hiroyuki Ogata, Chiyoko Tada, Nobuko Nakagawa, Nobue Fujibayashi, Tomofumi Shigekuni, Kenichi Sasaki
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Patent number: 8147983Abstract: A tin-plated steel sheet includes a plating layer containing tin on at least one surface of a steel sheet, and a chemical conversion coating containing P and tin on the plating layer is provided. In the steel sheet, a coated amount of the chemical conversion coating per surface is 1.0 to 50 mg/m2 in terms of P, an atomic ratio Sn/P obtained from the intensity of a P2p peak and that of a Sn3d peak is 1.0 to 1.5, the intensities being measured at the surface using an x-ray photoelectron spectroscopic method, and an atomic ratio O/P obtained from the intensity of the P2p peak and that of an O1s peak is 4.0 to 9.0. The phosphoric acid-based chemical conversion coating of the tin-plated steel sheet can suppress degradation in performance, which is caused by the growth of a tin oxide layer on the surface, instead of a conventional chromate coating.Type: GrantFiled: October 20, 2006Date of Patent: April 3, 2012Assignee: JFE Steel CorporationInventors: Takeshi Suzuki, Noriko Makiishi, Hiroki Iwasa, Takumi Tanaka, Tomofumi Shigekuni
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Publication number: 20110236581Abstract: A treatment solution for insulation coating for grain-oriented electrical steel sheets contains at least one selected from phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn; colloidal silica in a proportion of 0.5 to 10 mol in terms of SiO2 and a water-soluble vanadium compound in a proportion of 0.1 to 2.0 mol in terms of V, relative to PO4:1 mol in the phosphates.Type: ApplicationFiled: July 30, 2008Publication date: September 29, 2011Applicant: JFE STEEL CORPORATIONInventors: Mineo Muraki, Minoru Takashima, Tomofumi Shigekuni
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Publication number: 20110067786Abstract: A treatment solution for an insulation coating for a grain oriented electrical steel sheet includes at least one member selected from phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn, and colloidal silica in a proportion of 0.5 to 10 mol in terms of SiO2 and at least one member selected from permanganates of Mg, Sr, Zn, Ba, and Ca in a proportion of 0.02 to 2.5 mol in terms of metal elements in the permanganates, relative to PO4:1 mol in the phosphates.Type: ApplicationFiled: August 20, 2008Publication date: March 24, 2011Applicant: JFE STEEL CORPORATIONInventors: Minoru Takashima, Mineo Muraki, Makoto Watanabe, Tomofumi Shigekuni
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Publication number: 20100233484Abstract: An electrical steel sheet has an insulation coating having excellent corrosion resistance and punchability even without containing chromium and is prepared by applying a coating liquid on the surface of an electrical steel sheet, followed by baking the applied coating liquid, which coating liquid contains 100 parts by weight of polysiloxane polymer prepared by copolymerizing polysiloxane with one or more resins selected from acrylic resin, styrene resin, vinyl acetate resin, polyester resin, urethane resin, polyethylene resin, polypropylene resin, polyamide resin, polycarbonate resin, phenol resin, alkyd resin, and epoxy resin, and 1 to 50 parts by weigh of one or more compounds selected from melamine, isocyanate, silane coupling agent, and oxazoline, as a cross-linking agent.Type: ApplicationFiled: December 26, 2006Publication date: September 16, 2010Applicant: JFE STEEL CORPORATIONInventors: Tomofumi Shigekuni, Kazumichi Sashi, Masaaki Kohno, Yuka Komori
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Publication number: 20100221549Abstract: An insulation coating containing a composite resin composed of polysiloxane and a polymer containing carbon is formed on the surface of an electrical steel sheet, thus obtaining an electrical steel sheet having an insulation coating that gives corrosion resistance and punchability equivalent to or higher than those of Cr-containing insulation coating.Type: ApplicationFiled: December 26, 2006Publication date: September 2, 2010Applicant: JFE Steel Corporation,Inventors: Tomofumi Shigekuni, Kazumichi Sashi, Masaaki Kohno, Yuka Komori
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Publication number: 20100206437Abstract: A treatment solution for insulation coating for grain oriented electrical steel sheet includes at least one member selected from phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn, and colloidal silica in a proportion of 0.2 to 10 mol in terms of SiO2 and a titanium chelate compound in a proportion of 0.01 to 4.0 mol in terms of Ti, relative to PO4: 1 mol in the phosphates.Type: ApplicationFiled: August 28, 2008Publication date: August 19, 2010Applicant: JFE STEEL CORPORATIONInventors: Minoru Takashima, Mineo Muraki, Makoto Watanabe, Tomofumi Shigekuni
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Publication number: 20090155621Abstract: A tin-plated steel sheet includes a plating layer containing tin on at least one surface of a steel sheet, and a chemical conversion coating containing P and tin on the plating layer is provided. In the steel sheet, a coated amount of the chemical conversion coating per surface is 1.0 to 50 mg/m2 in terms of P, an atomic ratio Sn/P obtained from the intensity of a P2p peak and that of a Sn3d peak is 1.0 to 1.5, the intensities being measured at the surface using an x-ray photoelectron spectroscopic method, and an atomic ratio O/P obtained from the intensity of the P2p peak and that of an O1s peak is 4.0 to 9.0. The phosphoric acid-based chemical conversion coating of the tin-plated steel sheet can suppress degradation in performance, which is caused by the growth of a tin oxide layer on the surface, instead of a conventional chromate coating.Type: ApplicationFiled: October 20, 2006Publication date: June 18, 2009Inventors: Takeshi Suzuki, Noriko Makiishi, Hiroki Iwasa, Takumi Tanaka, Tomofumi Shigekuni
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Patent number: 6749952Abstract: The tin-plated steel sheet includes a base steel sheet; a tin plating layer coating approximately more than 97.0% of the base steel sheet; and a chemical conversion coating having approximately 0.5 to 100 mg/m2 phosphorus and approximately 0.1 to 250 mg/m2 silicon formed on the tin plating layer and an unplated region corresponding to approximately less than 3.0%. The tin-plated steel sheet does not contain chromium which is harmful to the environment but has superior overcoat adhesion property, discoloration resistance, and rust resistance.Type: GrantFiled: March 15, 2002Date of Patent: June 15, 2004Assignee: JFE Steel CorporationInventors: Tomofumi Shigekuni, Hisatada Nakakoji, Chiaki Kato
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Patent number: 6673470Abstract: A surface treated tin-plated steel sheet which has an alloy layer formed on the surface of a steel sheet, a tin plating layer being formed on said alloy layer with a remaining exposed portion of the alloy layer having an area of 30% or more of that of the alloy layer and, formed on said tin plating layer and said exposed portion of the alloy layer, a coating film containing P and Si in an amount of 0.5 to 100 mg/m2 and 0.1 to 250 mg/m2, respectively; and a chemical treatment solution for use in preparing the steel sheet which comprises a phosphate ion, a tin ion and a silane coupling agent and has a pH of 1.5 to 5.5. The surface treated tin-plated steel sheet is free from chromium which causes problems from an environmental view point, and also is excellent in adhesion with a paint, corrosion resistance after being coated, rust resistance, and formability.Type: GrantFiled: July 8, 2002Date of Patent: January 6, 2004Assignee: Kawasaki Steel CorporationInventors: Tomofumi Shigekuni, Hisatada Nakakoji, Kazuo Mochizuki, Chiaki Kato
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Publication number: 20030129442Abstract: A surface treated tin-plated steel sheet which has (1) an alloy layer formed on the surface of a steel sheet, (2) a tin plating layer being formed on said alloy layer with a remaining exposed portion of the alloy layer having an area of 30% or more of that of said alloy layer and, formed on said tin plating layer and said exposed portion of the alloy layer, (3) a coating film containing P and Si in an amount of 0.5 to 100 mg/m2 and 0.1 to 250 mg/m2, respectively: and a chemical treatment solution for use in preparing the steel sheet which comprises a phosphate ion, a tin ion and a silane coupling agent and has a pH of 1.5 to 5.5. The surface treated tin-plated steel sheet is free from chromium which causes problems from an environmental view point, and also is excellent in adhesion with a paint, corrosion resistance after being coated, rust resistance, and formability.Type: ApplicationFiled: July 8, 2002Publication date: July 10, 2003Inventors: Tomofumi Shigekuni, Hisatada Nakakoji, Kazuo Mochizuki, Chiaki Kato
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Publication number: 20020197505Abstract: The tin-plated steel sheet includes a base steel sheet; a tin plating layer coating approximately more than 97.0% of the base steel sheet; and a chemical conversion coating having approximately 0.5 to 100 mg/m2 phosphorus and approximately 0.1 to 250 mg/m2 silicon formed on the tin plating layer and an unplated region corresponding to approximately less than 3.0%. The tin-plated steel sheet does not contain chromium which is harmful to the environment but has superior overcoat adhesion property, discoloration resistance, and rust resistance.Type: ApplicationFiled: March 15, 2002Publication date: December 26, 2002Applicant: KAWASAKI STEEL CORPORATIONInventors: Tomofumi Shigekuni, Hisatada Nakakoji, Chiaki Kato