Patents by Inventor Tomoyuki KITAURA
Tomoyuki KITAURA 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: 11814703Abstract: Provided is a titanium composite material 1 including: a first surface layer portion 2; an inner layer portion 4; and a second surface layer portion 3; wherein: the first surface layer portion 2 and the second surface layer portion 3 are composed of a titanium alloy; the inner layer portion 4 is composed of a commercially pure titanium including pores; a thickness of at least one of the first surface layer portion 2 and the second surface layer portion 3 is 2 ?m or more, and a proportion of the thickness with respect to an overall thickness of the titanium composite material 1 is 40% or less; and a porosity in a cross section perpendicular to a sheet thickness direction is more than 0% and 30% or less.Type: GrantFiled: June 4, 2021Date of Patent: November 14, 2023Assignee: NIPPON STEEL CORPORATIONInventors: Tomoyuki Kitaura, Yoshihisa Shirai, Hideki Fujii
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Patent number: 11542581Abstract: A titanium product includes an inner layer portion and a surface layer portion joined to the inner layer portion. The surface layer portion has a composition consisting of, by mass %, O: 0.4% or less, Fe: 0.5% or less, Cl: 0.020% or less, the balance: Ti and impurities. The inner layer portion 3 has pores and a composition consisting of, by mass %, O: 0.4% or less, Fe: 0.5% or less, Cl: more than 0.020% and 0.60%, the balance: Ti and impurities. The area fraction of the pores in the inner layer portion in a cross-section perpendicular to the longitudinal direction of the titanium product is more than 0% and not more than 30%. The Cl content (ClI) of the inner layer portion, a thickness (tS) of the surface layer portion, and a thickness (tI) of the inner layer portion satisfy the expression [ClI?0.03+0.02×tS/tI].Type: GrantFiled: March 9, 2017Date of Patent: January 3, 2023Assignee: NIPPON STEEL CORPORATIONInventors: Tomoyuki Kitaura, Yoshihisa Shirai, Hideki Fujii
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Publication number: 20210292871Abstract: Provided is a titanium composite material 1 including: a first surface layer portion 2; an inner layer portion 4; and a second surface layer portion 3; wherein: the first surface layer portion 2 and the second surface layer portion 3 are composed of a titanium alloy; the inner layer portion 4 is composed of a commercially pure titanium including pores; a thickness of at least one of the first surface layer portion 2 and the second surface layer portion 3 is 2 ?m or more, and a proportion of the thickness with respect to an overall thickness of the titanium composite material 1 is 40% or less; and a porosity in a cross section perpendicular to a sheet thickness direction is more than 0% and 30% or less.Type: ApplicationFiled: June 4, 2021Publication date: September 23, 2021Inventors: Tomoyuki KITAURA, Yoshihisa SHIRAI, Hideki FUJII
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Patent number: 11066727Abstract: Provided is a titanium composite material 1 including: a first surface layer portion 2; an inner layer portion 4; and a second surface layer portion 3; wherein: the first surface layer portion 2 and the second surface layer portion 3 are composed of a titanium alloy; the inner layer portion 4 is composed of a commercially pure titanium including pores; a thickness of at least one of the first surface layer portion 2 and the second surface layer portion 3 is 2 ?m or more, and a proportion of the thickness with respect to an overall thickness of the titanium composite material 1 is 40% or less; and a porosity in a cross section perpendicular to a sheet thickness direction is more than 0% and 30% or less.Type: GrantFiled: July 29, 2016Date of Patent: July 20, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Tomoyuki Kitaura, Yoshihisa Shirai, Hideki Fujii
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Patent number: 10988832Abstract: A titanium-containing structure made of a titanium material includes: a package made of a commercially pure titanium material; and a filler packed into the package, wherein an internal pressure of the package is 10 Pa or less, the pressure being an absolute pressure, and wherein the filler includes at least one selected from titanium sponge, titanium briquette, and titanium scrap, and the filler has the same type of a chemical composition of the commercially pure titanium material. This titanium-containing structure enables production of a titanium product by performing hot working and eliminating the conventional melting step and forging step.Type: GrantFiled: October 7, 2015Date of Patent: April 27, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Yoshihisa Shirai, Hideki Fujii, Tomoyuki Kitaura
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Patent number: 10920300Abstract: A titanium composite material 1 is provided that includes: an inner layer 5 consisting of a commercially pure titanium or a titanium alloy; an outer layer 3 formed on at least one surface of the inner layer 5 and having a chemical composition that is different from a chemical composition of the inner layer 5; and an intermediate layer formed between the inner layer 5 and the outer layer 3 and having a chemical composition that is different from the chemical composition of the inner layer 5. The thickness of the outer layer 3 is 2 ?m or more, and occupies no more than 40% of the overall thickness per side. The thickness of the intermediate layer is 0.5 ?m or more. Despite being inexpensive, this titanium composite material has desired characteristics.Type: GrantFiled: July 29, 2016Date of Patent: February 16, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Yoshitsugu Tatsuzawa, Tomonori Kunieda, Koji Mitsuda, Kenichi Mori, Kazuhiro Takahashi, Hideki Fujii, Tomoyuki Kitaura
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Patent number: 10760152Abstract: Provided is an ?+? titanium alloy hot-rolled sheet consisting of, in mass %, Al: 4.7 to 5.5%, Fe: 0.5 to 1.4%, N: less than or equal to 0.03%, Si: 0.15 to 0.40%, a ratio of Si/O: 0.80 to 2.80, [O]eq in Expression (1): more than or equal to 0.13% and less than 0.25%, and the balance: Ti and impurities. In a case where an ND direction represents a normal direction of the hot-rolled sheet, a TD direction represents a sheet-width direction of the hot-rolled sheet, a c-axis orientation represents a normal direction of a (0001) plane in an ? phase, XND represents a strongest intensity among X-ray (0002) reflection relative intensities of crystal grains in which the c-axis orientation is in a range of 30° from the ND direction, and XTD represents a strongest intensity among intensities in which the c-axis orientation is in a range of ±10 degrees in the TD direction, XTD/XND is more than or equal to 4.Type: GrantFiled: November 28, 2014Date of Patent: September 1, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Akira Kawakami, Hideki Fujii, Kenichi Mori, Tomoyuki Kitaura
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Publication number: 20190032183Abstract: A titanium product includes an inner layer portion and a surface layer portion joined to the inner layer portion. The surface layer portion has a composition consisting of, by mass %, O: 0.4% or less, Fe: 0.5% or less, Cl: 0.020% or less, the balance: Ti and impurities. The inner layer portion 3 has pores and a composition consisting of, by mass %, O: 0.4% or less, Fe: 0.5% or less, Cl: more than 0.020% and 0.60%, the balance: Ti and impurities. The area fraction of the pores in the inner layer portion in a cross-section perpendicular to the longitudinal direction of the titanium product is more than 0% and not more than 30%. The Cl content (ClI) of the inner layer portion, a thickness (tS) of the surface layer portion, and a thickness (tI) of the inner layer portion satisfy the expression [ClI?0.03+0.02×tS/tI].Type: ApplicationFiled: March 9, 2017Publication date: January 31, 2019Inventors: Tomoyuki KITAURA, Yoshihisa SHIRAI, Hideki FUJII
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Publication number: 20180216210Abstract: Provided is a titanium composite material 1 including: a first surface layer portion 2; an inner layer portion 4; and a second surface layer portion 3; wherein: the first surface layer portion 2 and the second surface layer portion 3 are composed of a titanium alloy; the inner layer portion 4 is composed of a commercially pure titanium including pores; a thickness of at least one of the first surface layer portion 2 and the second surface layer portion 3 is 2 ?m or more, and a proportion of the thickness with respect to an overall thickness of the titanium composite material 1 is 40% or less; and a porosity in a cross section perpendicular to a sheet thickness direction is more than 0% and 30% or less.Type: ApplicationFiled: July 29, 2016Publication date: August 2, 2018Inventors: Tomoyuki KITAURA, Yoshihisa SHIRAI, Hideki FUJII
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Publication number: 20180216211Abstract: A titanium composite material 1 is provided that includes: an inner layer 5 consisting of a commercially pure titanium or a titanium alloy; an outer layer 3 formed on at least one surface of the inner layer 5 and having a chemical composition that is different from a chemical composition of the inner layer 5; and an intermediate layer formed between the inner layer 5 and the outer layer 3 and having a chemical composition that is different from the chemical composition of the inner layer 5. The thickness of the outer layer 3 is 2 ?m or more, and occupies no more than 40% of the overall thickness per side. The thickness of the intermediate layer is 0.5 ?m or more. Despite being inexpensive, this titanium composite material has desired characteristics.Type: ApplicationFiled: July 29, 2016Publication date: August 2, 2018Inventors: Yoshitsugu TATSUZAWA, Tomonori KUNIEDA, Koji MITSUDA, Kenichi MORI, Kzuhiro TAKAHASHI, Hideki FUJII, Tomoyuki KITAURA
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Publication number: 20170321312Abstract: Provided is an ?+? titanium alloy hot-rolled sheet consisting of, in mass %, Al: 4.7 to 5.5%, Fe: 0.5 to 1.4%, N: less than or equal to 0.03%, Si: 0.15 to 0.40%, a ratio of Si/O: 0.80 to 2.80, [O]eq in Expression (1): more than or equal to 0.13% and less than 0.25%, and the balance: Ti and impurities. In a case where an ND direction represents a normal direction of the hot-rolled sheet, a TD direction represents a sheet-width direction of the hot-rolled sheet, a c-axis orientation represents a normal direction of a (0001) plane in an ? phase, XND represents a strongest intensity among X-ray (0002) reflection relative intensities of crystal grains in which the c-axis orientation is in a range of 30° from the ND direction, and XTD represents a strongest intensity among intensities in which the c-axis orientation is in a range of ±10 degrees in the TD direction, XTD/XND is more than or equal to 4.Type: ApplicationFiled: November 28, 2014Publication date: November 9, 2017Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Akira KAWAKAMI, Hideki FUJII, Kenichi MORI, Tomoyuki KITAURA
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Publication number: 20170233850Abstract: A titanium-containing structure made of a titanium material includes: a package made of a commercially pure titanium material; and a filler packed into the package, wherein an internal pressure of the package is 10 Pa or less, the pressure being an absolute pressure, and wherein the filler includes at least one selected from titanium sponge, titanium briquet, and titanium scrap, and the filler has the same type of a chemical composition of the commercially pure titanium material. This titanium-containing structure enables production of a titanium product by performing hot working and eliminating the conventional melting step and forging step.Type: ApplicationFiled: October 7, 2015Publication date: August 17, 2017Inventors: Yoshihisa SHIRAI, Hideki FUJII, Tomoyuki KITAURA