Patents by Inventor Yoichi SERA
Yoichi SERA 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: 11703751Abstract: A reflective mask blank includes, on/above a substrate in the following order from the substrate side a multilayer reflective film which reflects EUV light and an absorber film which absorbs EUV light. The absorber film is a tantalum-based material film containing a tantalum-based material. The absorber film provides a peak derived from the tantalum-based material in an X-ray diffraction pattern, the peak having a peak diffraction angle (2?) of 36.8 degrees or more and a full width at half maximum of 1.5 degrees or more.Type: GrantFiled: September 1, 2021Date of Patent: July 18, 2023Assignee: AGC INC.Inventors: Hiroshi Hanekawa, Tsuyoshi Kakuta, Yoichi Sera, Sadatatsu Ikeda
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Publication number: 20210397077Abstract: A reflective mask blank includes, on/above a substrate in the following order from the substrate side a multilayer reflective film which reflects EUV light and an absorber film which absorbs EUV light. The absorber film is a tantalum-based material film containing a tantalum-based material. The absorber film provides a peak derived from the tantalum-based material in an X-ray diffraction pattern, the peak having a peak diffraction angle (2?) of 36.8 degrees or more and a full width at half maximum of 1.5 degrees or more.Type: ApplicationFiled: September 1, 2021Publication date: December 23, 2021Applicant: AGC INC.Inventors: Hiroshi HANEKAWA, Tsuyoshi KAKUTA, Yoichi SERA, Sadatatsu IKEDA
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Patent number: 11150550Abstract: A reflective mask blank includes, on/above a substrate in the following order from the substrate side a multilayer reflective film which reflects EUV light and an absorber film which absorbs EUV light. The absorber film is a tantalum-based material film containing a tantalum-based material. The absorber film provides a peak derived from the tantalum-based material in an X-ray diffraction pattern, the peak having a peak diffraction angle (2?) of 36.8 degrees or more and a full width at half maximum of 1.5 degrees or more.Type: GrantFiled: August 7, 2018Date of Patent: October 19, 2021Assignee: AGC INC.Inventors: Hiroshi Hanekawa, Tsuyoshi Kakuta, Yoichi Sera, Sadatatsu Ikeda
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Patent number: 10927039Abstract: An object of the present invention is to provide a chemically strengthened glass that can effectively suppress strength of a glass from being deteriorated even though performing chemical strengthening and has high transmittance (that is, low reflectivity). The present invention relates to a chemically strengthened glass having a compressive stress layer formed on a surface layer thereof by an ion exchange method, in which the glass contains sodium and boron, and has a delta transmittance being +0.1% or more, and in which a straight line obtained by a linear approximation of a hydrogen concentration Y in a region of a depth X from an outermost surface of the glass satisfies a specific relational equation in X=0.1 to 0.4 (?m).Type: GrantFiled: July 17, 2017Date of Patent: February 23, 2021Assignee: AGC Inc.Inventors: Izuru Kashima, Yusuke Fujiwara, Kiyoshi Tamai, Yuichi Suzuki, Yoichi Sera, Daisuke Kobayashi
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Publication number: 20200055771Abstract: The present invention relates to a film-attached glass substrate, characterized by: being provided with a glass substrate having two primary surfaces each having a compressive stress layer, and a film containing 1 at % or more of K disposed on one of the primary surfaces of the glass substrate; and the ratio of the difference in the amount of K in the compressive stress layer between the primary surfaces, the ratio being represented by formula (1), being ?0.027 to 0.027.Type: ApplicationFiled: October 25, 2019Publication date: February 20, 2020Applicant: AGC Inc.Inventors: Yosuke TAKEDA, Toru IKEDA, Naofumi AOYAMA, Tatsuya MIYAJIMA, Yoichi SERA
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Patent number: 10450226Abstract: A chemically strengthened glass having a compressive stress layer formed in a surface layer thereof according to an ion exchange method, in which the glass has a surface roughness (Ra) of 0.20 nm or higher, a hydrogen concentration Y in a region to a depth X from an outermost surface of the glass satisfies the following relational equation (I) at X=from 0.1 to 0.4 (?m), a surface strength F (N) measured by a ball-on-ring test under the following conditions is (F?1500×t2) relative to a sheet thickness t (mm) of the glass, and a surface of the glass has no polishing flaw: Y=aX+b??(I) in which meanings of respective symbols in the equation (I) are as follows: Y: hydrogen concentration (as H2O, mol/L); X: depth from the outermost surface of the glass (?m); a: ?0.270 to ?0.005; and b: 0.020 to 0.220.Type: GrantFiled: November 20, 2017Date of Patent: October 22, 2019Assignee: AGC Inc.Inventors: Izuru Kashima, Yusuke Fujiwara, Kiyoshi Tamai, Yuichi Suzuki, Daisuke Kobayashi, Yoichi Sera, Taku Yamada
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Patent number: 10308549Abstract: A chemically strengthened glass having a compressive stress layer formed in a surface layer thereof according to an ion exchange method, in which a surface of the glass has polishing flaws, the glass has a texture direction index (Stdi) of 0.30 or more, a hydrogen concentration Y in a region to a depth X from an outermost surface of the glass satisfies the following relational equation (I) at X=from 0.1 to 0.4 (?m), and a surface strength F (N) measured by a ball-on-ring test is (F?1400×t2) relative to a sheet thickness t (mm) of the glass: Y=aX+b??(I) in which meanings of respective symbols in the equation (I) are as follows: Y: hydrogen concentration (as H2O, mol/L), X: depth from the outermost surface of the glass (?m), a: ?0.300 or more, and b: 0.220 or less.Type: GrantFiled: January 19, 2016Date of Patent: June 4, 2019Assignee: AGC Inc.Inventors: Izuru Kashima, Yusuke Fujiwara, Kiyoshi Tamai, Yuichi Suzuki, Daisuke Kobayashi, Yoichi Sera, Taku Yamada, Noriko Tanabe
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Publication number: 20190049836Abstract: A reflective mask blank includes, on/above a substrate in the following order from the substrate side a multilayer reflective film which reflects EUV light and an absorber film which absorbs EUV light. The absorber film is a tantalum-based material film containing a tantalum-based material. The absorber film provides a peak derived from the tantalum-based material in an X-ray diffraction pattern, the peak having a peak diffraction angle (2?) of 36.8 degrees or more and a full width at half maximum of 1.5 degrees or more.Type: ApplicationFiled: August 7, 2018Publication date: February 14, 2019Applicant: AGC INC.Inventors: Hiroshi HANEKAWA, Tsuyoshi KAKUTA, Yoichi SERA, Sadatatsu IKEDA
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Publication number: 20180072619Abstract: A chemically strengthened glass having a compressive stress layer formed in a surface layer thereof according to an ion exchange method, in which the glass has a surface roughness (Ra) of 0.20 nm or higher, a hydrogen concentration Y in a region to a depth X from an outermost surface of the glass satisfies the following relational equation (I) at X=from 0.1 to 0.4 (?m), a surface strength F (N) measured by a ball-on-ring test under the following conditions is (F?1500×t2) relative to a sheet thickness t (mm) of the glass, and a surface of the glass has no polishing flaw: Y=aX+b??(I) in which meanings of respective symbols in the equation (I) are as follows: Y: hydrogen concentration (as H2O, mol/L); X: depth from the outermost surface of the glass (?m); a: ?0.270 to ?0.005; and b: 0.020 to 0.220.Type: ApplicationFiled: November 20, 2017Publication date: March 15, 2018Applicant: ASAHI GLASS COMPANY, LIMITEDInventors: Izuru KASHIMA, Yusuke FUJIWARA, Kiyoshi TAMAI, Yuichi SUZUKI, Daisuke KOBAYASHI, Yoichi SERA, Taku YAMADA
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Patent number: 9884784Abstract: A chemically strengthened glass having a compressive stress layer formed in a surface layer thereof according to an ion exchange method, in which the glass has a surface roughness (Ra) of 0.20 nm or higher, a hydrogen concentration Y in a region to a depth X from an outermost surface of the glass satisfies the following relational equation (I) at X=from 0.1 to 0.4 (?m), a surface strength F (N) measured by a ball-on-ring test under the following conditions is (F?1500×t2) relative to a sheet thickness t (mm) of the glass, and a surface of the glass has no polishing flaw: Y=aX+b??(I) in which meanings of respective symbols in the equation (I) are as follows: Y: hydrogen concentration (as H2O, mol/L); X: depth from the outermost surface of the glass (?m); a: ?0.270 to ?0.005; and b: 0.020 to 0.220.Type: GrantFiled: January 19, 2016Date of Patent: February 6, 2018Assignee: ASAHI GLASS COMPANY, LIMITEDInventors: Izuru Kashima, Yusuke Fujiwara, Kiyoshi Tamai, Yuichi Suzuki, Daisuke Kobayashi, Yoichi Sera, Taku Yamada
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Patent number: 9828286Abstract: A method for producing a chemically strengthened glass, including a step of bringing a glass containing sodium into contact with an inorganic salt containing potassium nitrate, thereby performing ion exchange of a Na ion in the glass with a K ion in the inorganic salt, in which the inorganic salt contains at least one salt selected from the group consisting of K2CO3, Na2CO3, KHCO3, NaHCO3, K3PO4, Na3PO4, K2SO4, Na2SO4, KOH and NaOH, and the method includes: a step of washing the glass after the ion exchange; a step of subjecting the glass to an acid treatment after the washing; and a step of subjecting the glass to an alkali treatment after the acid treatment.Type: GrantFiled: January 19, 2016Date of Patent: November 28, 2017Assignee: ASAHI GLASS COMPANY, LIMITEDInventors: Izuru Kashima, Yusuke Fujiwara, Kiyoshi Tamai, Yuichi Suzuki, Daisuke Kobayashi, Yoichi Sera, Taku Yamada
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Publication number: 20170313621Abstract: An object of the present invention is to provide a chemically strengthened glass that can effectively suppress strength of a glass from being deteriorated even though performing chemical strengthening and has high transmittance (that is, low reflectivity). The present invention relates to a chemically strengthened glass having a compressive stress layer formed on a surface layer thereof by an ion exchange method, in which the glass contains sodium and boron, and has a delta transmittance being +0.1% or more, and in which a straight line obtained by a linear approximation of a hydrogen concentration Y in a region of a depth X from an outermost surface of the glass satisfies a specific relational equation in X=0.1 to 0.4 (?m).Type: ApplicationFiled: July 17, 2017Publication date: November 2, 2017Applicant: ASAHI GLASS COMPANY, LIMITEDInventors: Izuru KASHIMA, Yusuke FUJIWARA, Kiyoshi TAMAI, Yuichi SUZUKI, Yoichi SERA, Daisuke KOBAYASHI
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Publication number: 20170158542Abstract: The glass plate according to the present invention has a buffer layer containing a plurality of sulfate crystals on a bottom surface which is brought into contact with a molten metal during formation in accordance with a float method, and the plurality of sulfate crystals have a median value of equivalent circle diameters of 350 nm or smaller as observed from a thickness direction.Type: ApplicationFiled: December 19, 2016Publication date: June 8, 2017Applicant: Asahi Glass Company, LimitedInventors: Yoichi SERA, Ryoji Akiyama, Masamichi Kawakami, Shiro Tanii, Katsuyuki Nakano, Daiki Akie, Noriko Kishikawa
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Publication number: 20170087927Abstract: A layered product includes a substrate including a first surface and second surface that face each other, wherein the layered product includes a metal film on the first surface of the substrate, wherein gaps are dispersed between the substrate and the metal film, the gaps optically affecting light in a visible light region, wherein, when the layered product is measured from the second surface of the substrate, an absorption ratio with respect to visible light, the absorption ratio being an average value in a range of wavelength from 400 nm to 700 nm, is greater than or equal to 50%, reflectance, the reflectance being an average value in a range of wavelength from 400 nm to 700 nm, is less than or equal to 40%, and brightness L* of a D65 light source in a visual field of 10 degrees is less than or equal to 70.Type: ApplicationFiled: December 12, 2016Publication date: March 30, 2017Applicant: Asahi Glass Company, LimitedInventors: Misa INAMOTO, Takashi SHIBUYA, Yoichi SERA, Takashi OKADA
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Publication number: 20160207828Abstract: A method for producing a chemically strengthened glass, including a step of bringing a glass containing sodium into contact with an inorganic salt containing potassium nitrate, thereby performing ion exchange of a Na ion in the glass with a K ion in the inorganic salt, in which the inorganic salt contains at least one salt selected from the group consisting of K2CO3, Na2CO3, KHCO3, NaHCO3, K3PO4, Na3PO4, K2SO4, Na2SO4, KOH and NaOH, and the method includes: a step of washing the glass after the ion exchange; a step of subjecting the glass to an acid treatment after the washing; and a step of subjecting the glass to an alkali treatment after the acid treatment.Type: ApplicationFiled: January 19, 2016Publication date: July 21, 2016Applicant: Asahi Glass Company, LimitedInventors: lzuru KASHIMA, Yusuke FUJIWARA, Kiyoshi TAMAI, Yuichi SUZUKI, Daisuke KOBAYASHI, Yoichi SERA, Taku YAMADA
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Publication number: 20160130179Abstract: A chemically strengthened glass having a compressive stress layer formed in a surface layer thereof according to an ion exchange method, in which the glass has a surface roughness (Ra) of 0.20 nm or higher, a hydrogen concentration Y in a region to a depth X from an outermost surface of the glass satisfies the following relational equation (I) at X=from 0.1 to 0.4 (?m), a surface strength F (N) measured by a ball-on-ring test under the following conditions is (F?1500×t2) relative to a sheet thickness t (mm) of the glass, and a surface of the glass has no polishing flaw: Y=aX+b??(I) in which meanings of respective symbols in the equation (I) are as follows: Y: hydrogen concentration (as H2O, mol/L); X: depth from the outermost surface of the glass (?m); a: ?0.270 to ?0.005; and b: 0.020 to 0.220.Type: ApplicationFiled: January 19, 2016Publication date: May 12, 2016Applicant: ASAHI GLASS COMPANY, LIMITEDInventors: lzuru KASHIMA, Yusuke FUJIWARA, Kiyoshi TAMAI, Yuichi SUZUKI, Daisuke KOBAYASHI, Yoichi SERA, Taku YAMADA
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Publication number: 20160130178Abstract: A chemically strengthened glass having a compressive stress layer formed in a surface layer thereof according to an ion exchange method, in which a surface of the glass has polishing flaws, the glass has a texture direction index (Stdi) of 0.30 or more, a hydrogen concentration Y in a region to a depth X from an outermost surface of the glass satisfies the following relational equation (I) at X=from 0.1 to 0.4 (?m), and a surface strength F (N) measured by a ball-on-ring test is (F?1400×t2) relative to a sheet thickness t (mm) of the glass: Y=aX+b??(I) in which meanings of respective symbols in the equation (I) are as follows: Y: hydrogen concentration (as H2O, mol/L), X: depth from the outermost surface of the glass (?m), a: ?0.300 or more, and b: 0.220 or less.Type: ApplicationFiled: January 19, 2016Publication date: May 12, 2016Applicant: Asahi Glass Company, LimitedInventors: lzuru KASHIMA, Yusuke FUJIWARA, Kiyoshi TAMAI, Yuichi SUZUKI, Daisuke KOBAYASHI, Yoichi SERA, Taku YAMADA, Noriko TANABE
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Publication number: 20150072129Abstract: A glass sheet includes 4 mol % or more of Al2O3. In the glass sheet, a surface Na2O amount in one surface of the glass sheet is lower than the surface Na2O amount in the other surface of the glass sheet by 0.2 mass % to 1.2 mass %.Type: ApplicationFiled: September 26, 2014Publication date: March 12, 2015Applicant: ASAHI GLASS COMPANY, LIMITEDInventors: Naoki OKAHATA, Koji NAKAGAWA, Kazuhiko YAMANAKA, Kunio WATANABE, Shiro TANII, Nobuaki IKAWA, Daisuke KOBAYASHI, Junichi MIYASHITA, Ryosuke KATO, Toshifumi NIHEI, Yoichi SERA, Yasuo HAYASHI, Makoto FUKAWA
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MEMBER WITH SEALING MATERIAL LAYER, ELECTRONIC DEVICE, AND METHOD OF MANUFACTURING ELECTRONIC DEVICE
Publication number: 20140342136Abstract: It is an object to provide a member with a sealing material layer having good sealability when low-power sealing laser light is used. A member with a sealing material layer includes a substrate having a sealing region on a surface; and a sealing material layer on the sealing region and containing sealing glass and a low-expansion filler, wherein the sealing material layer has a first region on the substrate side with respect to a center of the layer and a second region opposite the substrate with respect to the center, and has, in a cross section taken along the thickness direction of the sealing material layer, a part where a ratio A/B between a proportion “A” of an area of the low-expansion filler in the first region and a proportion “B” of an area of the low-expansion filler in the second region is less than 1.0.Type: ApplicationFiled: May 7, 2014Publication date: November 20, 2014Applicant: ASAHI GLASS COMPANY, LIMITEDInventors: Yohei NAGAO, Ryota MURAKAMI, Yoichi SERA