Patents by Inventor Kazuto Yamagata
Kazuto Yamagata 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: 11844201Abstract: A radio wave absorber (1a) includes a resistive layer (20), an electrical conductor (30), and a dielectric layer (10). The resistive layer (20) includes indium tin oxide as a main component. The electrical conductor (30) reflects a radio wave. The dielectric layer (10) is disposed between the resistive layer (20) and the electrical conductor (30) in the thickness direction of the resistive layer (20). The dielectric layer (10) is formed of a polymer. The content of tin oxide in the indium tin oxide included in the resistive layer (20) is more than 0 weight % and less than 20 weight %. The number of hydrogen atoms included in the resistive layer (20) is 5% or more of the total number of indium atoms, tin atoms, oxygen atoms, and hydrogen atoms included in the resistive layer (20).Type: GrantFiled: September 20, 2019Date of Patent: December 12, 2023Assignee: NITTO DENKO CORPORATIONInventors: Motoki Haishi, Kazuto Yamagata, Hironobu Machinaga
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Publication number: 20230356500Abstract: An electromagnetic wave absorber (1) includes a dielectric layer (10), a resistive layer (20), and an electrically conductive layer (30). The resistive layer (20) is disposed on one principal surface of the dielectric layer (10). The electrically conductive layer (30) is disposed on the other principal surface of the dielectric layer (10) and has a sheet resistance lower than a sheet resistance of the resistive layer (20). The resistive layer (20) has a sheet resistance of 200 to 600 ?/?. When the resistive layer (20) is subjected to an immersion treatment in which the resistive layer (20) is immersed in a 5 weight % aqueous solution of NaOH for 5 minutes, an absolute value of a difference between a sheet resistance of the resistive layer (20) before the immersion treatment and a sheet resistance of the resistive layer (20) after the immersion treatment is less than 100 ?/?.Type: ApplicationFiled: July 21, 2023Publication date: November 9, 2023Applicant: NITTO DENKO CORPORATIONInventors: Kazuto Yamagata, Hironobu Machinaga, Eri Ueda, Hiroichi Ukei, Takehiro Ui
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Patent number: 11806980Abstract: An electromagnetic wave absorber (1) includes a dielectric layer (10), a resistive layer (20), and an electrically conductive layer (30). The resistive layer (20) is disposed on one principal surface of the dielectric layer (10). The electrically conductive layer (30) is disposed on the other principal surface of the dielectric layer (10) and has a sheet resistance lower than a sheet resistance of the resistive layer (20). The resistive layer (20) has a sheet resistance of 200 to 600?/?. When the resistive layer (20) is subjected to an immersion treatment in which the resistive layer (20) is immersed in a 5 weight % aqueous solution of NaOH for 5 minutes, an absolute value of a difference between a sheet resistance of the resistive layer (20) before the immersion treatment and a sheet resistance of the resistive layer (20) after the immersion treatment is less than 100?/?.Type: GrantFiled: March 27, 2018Date of Patent: November 7, 2023Assignee: NITTO DENKO CORPORATIONInventors: Kazuto Yamagata, Hironobu Machinaga, Eri Ueda, Hiroichi Ukei, Takehiro Ui
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Publication number: 20230137503Abstract: The present invention relates to an electromagnetically transparent metallic-luster member including a base and a metal layer formed over the base, wherein the metal layer includes a plurality of portions which are at least partly discontinuous and separate from each other, the metal layer includes a portion including aluminum element and a portion including indium element, the portion including indium element localizes in the metal layer, and a volume content (vol %) of the portion including indium element in the metal layer is 5-40 vol %.Type: ApplicationFiled: March 8, 2021Publication date: May 4, 2023Inventors: Xiaolei CHEN, Taichi WATANABE, Hironobu MACHINAGA, Kazuto YAMAGATA
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Patent number: 11622482Abstract: An electromagnetic wave absorber (1) includes a dielectric layer (10), a resistive layer (20), and an electrically conductive layer (30). The resistive layer (20) is disposed on one principal surface of the dielectric layer (10). The electrically conductive layer (30) is disposed on the other principal surface of the dielectric layer (10) and has a sheet resistance lower than a sheet resistance of the resistive layer (20). The resistive layer (20) is a layer that includes tin oxide or titanium oxide as a main component or a layer that is made of indium tin oxide including 40 weight % or more of tin oxide.Type: GrantFiled: March 27, 2018Date of Patent: April 4, 2023Assignee: NITTO DENKO CORPORATIONInventors: Kazuto Yamagata, Hironobu Machinaga, Yuuki Takeda, Hiroichi Ukei, Takehiro Ui
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Patent number: 11387566Abstract: An electromagnetic wave absorber (1a) includes a first layer (10) and an electrically conductive layer (20). The first layer (10) is a dielectric layer or a magnetic layer. The electrically conductive layer (20) is provided on at least one surface of the first layer. A product of a Young's modulus of the first layer (10) and a thickness of the first layer (10) is 0.1 to 1000 MPa·mm. The first layer (10) has a relative permittivity of 1 to 10.Type: GrantFiled: January 23, 2018Date of Patent: July 12, 2022Assignee: NITTO DENKO CORPORATIONInventors: Hiroichi Ukei, Takehiro Ui, Hironobu Machinaga, Kazuto Yamagata, Yuuki Takeda
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Publication number: 20220214299Abstract: A carbon electrode includes a substrate, and a conductive carbon layer disposed at an upper side of the substrate and having an sp2 bond and an sp3 bond. On an upper surface of the conductive carbon layer, the concentration ratio of oxygen to carbon is 0.07 or more. The ratio of a number of sp3 bonded carbon atoms to the sum of a number of sp2 bonded carbon atoms and the number of sp3 bonded carbon atoms is 0.35 or more.Type: ApplicationFiled: March 25, 2020Publication date: July 7, 2022Inventors: Kazuto YAMAGATA, Motoki HAISHI, Mitsunobu TAKEMOTO, Koya OSUKA, Dai KATO, Tomoyuki KAMATA
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Patent number: 11351753Abstract: Provided is an electromagnetic wave transmissive metal member capable of being easily produced at a low production cost, with both a metallic luster and an electromagnetic wave transmissibility, an article using the electromagnetic wave transmissive metal member, and a production method for an electromagnetic wave transmissive metal film. The electromagnetic wave transmissive metal member comprises a metal layer and a crack layer, wherein the metal layer and the crack layer have, in their respective planes, a plurality of linear cracks extending substantially parallel to each other. The linear cracks in the metal layer and the linear cracks in the crack layer penetrate through their respective layers in a thickness direction, and are continuous with each other in the thickness direction.Type: GrantFiled: June 28, 2017Date of Patent: June 7, 2022Assignee: NITTO DENKO CORPORATIONInventors: Hajime Nishio, Hironobu Machinaga, Kazuto Yamagata, Masaharu Arimoto, Xiaolei Chen, Rie Hayashiuchi
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Patent number: 11266048Abstract: An electromagnetic wave absorber (1a) includes a resistive layer (10), an electrically conductive layer (20) and a dielectric layer (30). The electrically conductive layer (20) has a sheet resistance lower than a sheet resistance of the resistive layer (10). The dielectric layer (30) is disposed between the resistive layer (10) and the electrically conductive layer (20). The electromagnetic wave absorber (1a) has a first slit (15). The first slit (15) extends, in the resistive layer (10), from a first principal surface (10a) distal to the dielectric layer (30) toward the dielectric layer (30) in a direction perpendicular to the first principal surface (10a) and divides the resistive layer (10) into a plurality of first blocks (17). Each of the first blocks (17) has a minimum dimension (D1) of 2 mm or more at the first principal surface (10a).Type: GrantFiled: December 28, 2018Date of Patent: March 1, 2022Assignee: NITTO DENKO CORPORATIONInventors: Kazuto Yamagata, Hironobu Machinaga, Hiroichi Ukei, Takehiro Ui
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Publication number: 20220039302Abstract: A radio wave absorber (la) includes a resistive layer (20), an electrical conductor (30), and a dielectric layer (10). The resistive layer (20) includes indium tin oxide as a main component. The electrical conductor (30) reflects a radio wave. The dielectric layer (10) is disposed between the resistive layer (20) and the electrical conductor (30) in the thickness direction of the resistive layer (20). The dielectric layer (10) is formed of a polymer. The content of tin oxide in the indium tin oxide included in the resistive layer (20) is more than 0 weight % and less than 20 weight %. The number of hydrogen atoms included in the resistive layer (20) is 5% or more of the total number of indium atoms, tin atoms, oxygen atoms, and hydrogen atoms included in the resistive layer (20).Type: ApplicationFiled: September 20, 2019Publication date: February 3, 2022Applicant: NITTO DENKO CORPORATIONInventors: Motoki Haishi, Kazuto Yamagata, Hironobu Machinaga
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Publication number: 20220015275Abstract: For the purpose of providing an electromagnetic wave absorber usable for radar having a high resolution and sufficiently adaptable to a plurality of radars different in frequency, the bandwidth of a frequency band in which an electromagnetic wave absorption amount is not less than 20 dB is not less than 2 GHz, within a frequency band of 60 to 90 GHz.Type: ApplicationFiled: September 9, 2021Publication date: January 13, 2022Applicant: NITTO DENKO CORPORATIONInventors: Hiroichi Ukei, Takehiro Ui, Kazuto Yamagata, Yuki Takeda, Hironobu Machinaga, Yuya Kitagawa, Kazuaki Sasa
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Patent number: 11145988Abstract: For the purpose of providing an electromagnetic wave absorber usable for radar having a high revolution and sufficiently adaptable to a plurality of radars different in frequency, the bandwidth of a frequency band in which an electromagnetic wave absorption amount is not less than 20 dB is not less than 2 GHz, within a frequency band of 60 to 90 GHz.Type: GrantFiled: December 14, 2016Date of Patent: October 12, 2021Assignee: NITTO DENKO CORPORATIONInventors: Hiroichi Ukei, Takehiro Ui, Kazuto Yamagata, Yuki Takeda, Hironobu Machinaga, Yuya Kitagawa, Kazuaki Sasa
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Publication number: 20210059085Abstract: An electromagnetic wave absorber (1a) includes a resistive layer (10), an electrically conductive layer (20) and a dielectric layer (30). The electrically conductive layer (20) has a sheet resistance lower than a sheet resistance of the resistive layer (10). The dielectric layer (30) is disposed between the resistive layer (10) and the electrically conductive layer (20). The electromagnetic wave absorber (1a) has a first slit (15). The first slit (15) extends, in the resistive layer (10), from a first principal surface (10a) distal to the dielectric layer (30) toward the dielectric layer (30) in a direction perpendicular to the first principal surface (10a) and divides the resistive layer (10) into a plurality of first blocks (17). Each of the first blocks (17) has a minimum dimension (D1) of 2 mm or more at the first principal surface (10a).Type: ApplicationFiled: December 28, 2018Publication date: February 25, 2021Applicant: NITTO DENKO CORPORATIONInventors: Kazuto Yamagata, Hironobu Machinaga, Hiroichi Ukei, Takehiro Ui
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Patent number: 10816164Abstract: A lamp reflector (10a) includes a mirror surface (11) and a laminate (12a). The mirror surface (11) is a surface for reflecting light from a light source (30) to guide the light in a predetermined direction. The laminate (12a) covers at least a part of the mirror surface (11) to absorb an electromagnetic wave having a specific frequency of 20 GHz to 90 GHz. The laminate (12a) allows the light from the light source (30) to transmit therethrough toward the mirror surface (11).Type: GrantFiled: June 12, 2018Date of Patent: October 27, 2020Assignee: NITTO DENKO CORPORATIONInventors: Hiroichi Ukei, Takehiro Ui, Ryosuke Aoki, Hironobu Machinaga, Kazuto Yamagata, Yuuki Takeda
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Publication number: 20200207059Abstract: An electromagnetic wave absorber (1) includes a dielectric layer (10), a resistive layer (20), and an electrically conductive layer (30). The resistive layer (20) is disposed on one principal surface of the dielectric layer (10). The electrically conductive layer (30) is disposed on the other principal surface of the dielectric layer (10) and has a sheet resistance lower than a sheet resistance of the resistive layer (20). The resistive layer (20) has a sheet resistance of 200 to 600?/?. When the resistive layer (20) is subjected to an immersion treatment in which the resistive layer (20) is immersed in a 5 weight % aqueous solution of NaOH for 5 minutes, an absolute value of a difference between a sheet resistance of the resistive layer (20) before the immersion treatment and a sheet resistance of the resistive layer (20) after the immersion treatment is less than 100?/?.Type: ApplicationFiled: March 27, 2018Publication date: July 2, 2020Applicant: NITTO DENKO CORPORATIONInventors: Kazuto Yamagata, Hironobu Machinaga, Eri Ueda, Hiroichi Ukei, Takehiro Ui
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Publication number: 20200214181Abstract: An electromagnetic wave absorber (1) includes a dielectric layer (10), a resistive layer (20), and an electrically conductive layer (30). The resistive layer (20) is disposed on one principal surface of the dielectric layer (10). The electrically conductive layer (30) is disposed on the other principal surface of the dielectric layer (10) and has a sheet resistance lower than a sheet resistance of the resistive layer (20). The resistive layer (20) is a layer that includes tin oxide or titanium oxide as a main component or a layer that is made of indium tin oxide including 40 weight % or more of tin oxide.Type: ApplicationFiled: March 27, 2018Publication date: July 2, 2020Applicant: NITTO DENKO CORPORATIONInventors: Kazuto Yamagata, Hironobu Machinaga, Yuuki Takeda, Hiroichi Ukei, Takehiro Ui
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Patent number: 10701848Abstract: For the purpose of providing an electromagnetic wave absorber capable of holding excellent performance over a long period of time, the electromagnetic wave absorber includes: a dielectric layer B including a polymer film and having a first surface and a second surface; a resistive layer A formed on the first surface of the dielectric layer Band containing indium tin oxide as a main component; and an electrically conductive layer C formed on the second surface of the dielectric layer B and having a sheet resistance lower than that of the resistive layer A, wherein the indium tin oxide in the resistive layer A contains 20 to 40 wt. % of tin oxide based on the total weight of the indium tin oxide.Type: GrantFiled: December 14, 2016Date of Patent: June 30, 2020Assignee: NITTO DENKO CORPORATIONInventors: Kazuto Yamagata, Hironobu Machinaga, Takehiro Ui, Hiroichi Ukei, Yuya Kitagawa, Kazuaki Sasa
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Publication number: 20200161771Abstract: An electromagnetic wave absorber (1a) includes a first layer (10) and an electrically conductive layer (20). The first layer (10) is a dielectric layer or a magnetic layer. The electrically conductive layer (20) is provided on at least one surface of the first layer. A product of a Young's modulus of the first layer (10) and a thickness of the first layer (10) is 0.1 to 1000 MPa · mm. The first layer (10) has a relative permittivity of 1 to 10.Type: ApplicationFiled: January 23, 2018Publication date: May 21, 2020Applicant: NITTO DENKO CORPORATIONInventors: Hiroichi Ukei, Takehiro Ui, Hironobu Machinaga, Kazuto Yamagata, Yuuki Takeda
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Publication number: 20200128705Abstract: An electromagnetic wave absorber (1) includes a dielectric layer (10), a resistive layer (20), and an electrical conductive layer (30). The resistive layer (20) is disposed on one principal surface of the dielectric layer (10). The electrical conductive layer (30) is disposed on the other principal surface of the dielectric layer (10) and has a sheet resistance lower than a sheet resistance of the resistive layer (20). The resistive layer (20) includes indium oxide as a main component, has a polycrystalline structure, and has a sheet resistance of 260 to 500?/? and a specific resistance of 5×10?4 ?·cm or more.Type: ApplicationFiled: March 27, 2018Publication date: April 23, 2020Applicant: NITTO DENKO CORPORATIONInventors: Kazuto Yamagata, Hironobu Machinaga, Yuuki Takeda, Eri Ueda, Hiroichi Ukei, Takehiro Ui
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Publication number: 20200116332Abstract: A lamp reflector (10a) includes a mirror surface (11) and a laminate (12a). The mirror surface (11) is a surface for reflecting light from a light source (30) to guide the light in a predetermined direction. The laminate (12a) covers at least a part of the mirror surface (11) to absorb an electromagnetic wave having a specific frequency of 20 GHz to 90 GHz. The laminate (12a) allows the light from the light source (30) to transmit therethrough toward the mirror surface (11).Type: ApplicationFiled: June 12, 2018Publication date: April 16, 2020Applicant: NITTO DENKO CORPORATIONInventors: Hiroichi Ukei, Takehiro Ui, Ryosuke Aoki, Hironobu Machinaga, Kazuto Yamagata, Yuuki Takeda