Patents by Inventor Motoyuki Hirose

Motoyuki Hirose 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).

  • Patent number: 10974986
    Abstract: The present invention relates to an alkali-free glass substrate in which when the alkali-free glass substrate is melted, and while holding a temperature at 1400° C., reduced in pressure from an atmospheric pressure to 33.33 kPa at a constant pressure reduction rate for 20 minutes and held at 33.33 kPa for 5 minutes, a diameter of a grown bubble is at least 3 times a diameter of an initial bubble. A bubble having a diameter of 0.1 to 0.3 mm contained in a molten glass at 1400° C. before starting pressure reduction is defined as the initial bubble. A bubble after held at 33.33 kPa for 5 minutes corresponding to the initial bubble is defined as a grown bubble.
    Type: Grant
    Filed: September 19, 2018
    Date of Patent: April 13, 2021
    Assignee: AGC INC.
    Inventors: Motoyuki Hirose, Takashi Enomoto
  • Publication number: 20210024403
    Abstract: An alkali-free glass has a strain point of 650° C. or more, an average coefficient of thermal expansion at 50 to 350° C. of from 30×10?7 to 45×10?7/° C., and a temperature T2 at which a glass viscosity reaches 102 dPa·s of from 1,500 to 1,800° C. The alkali-free glass contains, as represented by mol % based on oxides, SiO2: from 62 to 70%, Al2O3: from 9 to 16% B2O3: from 0 to 12%, MgO: from 3 to 10%, CaO: from 4 to 12%, SrO: from 0 to 6%, and Fe2O3: from 0.001 to 0.04%, provided that MgO+CaO+SrO+BaO is from 12 to 25%. The alkali-free glass has a ?-OH value of from 0.35 to 0.85/mm.
    Type: Application
    Filed: October 14, 2020
    Publication date: January 28, 2021
    Applicant: AGC Inc.
    Inventors: Hirofumi TOKUNAGA, Kazutaka ONO, Motoyuki HIROSE
  • Publication number: 20200299180
    Abstract: An alkali-free glass substrate contains, as represented by mass % based on oxides: 54% to 66% of SiO2; 10% to 23% of Al2O3; 6% to 12% of B2O3; and 8% to 26% of MgO+CaO+SrO+BaO. The alkali-free glass substrate has ?-OH of 0.15 mm?1 to 0.5 mm?1, and a Cl content of 0.1 to 0.35 mass %. A bubble growth index I of the alkali-free glass substrate given by the following formula is 280 or more: I=590.5×[?-OH]+874.1×[Cl]5.7×[B2O3]?33.3. In the formula, [?-OH] is ?-OH of the alkali-free glass substrate in mm?1, [Cl] is the Cl content of the alkali-free glass substrate in mass %, and [B2O3] is a B2O3 content of the alkali-free glass substrate in mass %.
    Type: Application
    Filed: March 16, 2020
    Publication date: September 24, 2020
    Applicant: AGC INC.
    Inventors: Motoyuki HIROSE, Takashi ENOMOTO
  • Publication number: 20200299179
    Abstract: An alkali-free glass substrate contains, as represented by mass % based on oxides: 54% to 68% of SiO2; 10% to 25% of Al2O3; 0.1% to 5.5% of B2O3; and 8% to 26% of MgO+CaO+SrO+BaO. The alkali-free glass substrate has ?-OH of 0.15 mm?1 to 0.35 mm?1, and a Cl content of 0.15 to 0.3 mass %. A bubble growth index I of the alkali-free glass substrate given by the following formula is 320 or more: I=590.5×[?-OH]+874.1×[Cl]?5.7×[B2O3]?33.3. In the formula, [?-OH] is ?-OH of the alkali-free glass substrate in mm?1, [Cl] is the Cl content of the alkali-free glass substrate in mass %, and [B2O3] is a B2O3 content of the alkali-free glass substrate in mass %.
    Type: Application
    Filed: March 16, 2020
    Publication date: September 24, 2020
    Applicant: AGC INC.
    Inventors: Motoyuki HIROSE, Takashi ENOMOTO
  • Patent number: 10730786
    Abstract: The present invention relates to an alkali-free glass and a method for producing the same. More specifically, the present invention relates to an alkali-free glass suitable as a glass for substrates of various displays such as liquid crystal display, and a method for producing the same. According to the present invention, an alkali-free glass suitable as a glass for display substrates, in which inclusion of bubbles is greatly reduced by virtue of containing a refining agent and suppressing the stirring reboil, is obtained.
    Type: Grant
    Filed: April 24, 2019
    Date of Patent: August 4, 2020
    Assignee: AGC INC.
    Inventors: Hirofumi Tokunaga, Kazutaka Ono, Motoyuki Hirose
  • Publication number: 20190248697
    Abstract: The present invention relates to an alkali-free glass and a method for producing the same. More specifically, the present invention relates to an alkali-free glass suitable as a glass for substrates of various displays such as liquid crystal display, and a method for producing the same. According to the present invention, an alkali-free glass suitable as a glass for display substrates, in which inclusion of bubbles is greatly reduced by virtue of containing a refining agent and suppressing the stirring reboil, is obtained.
    Type: Application
    Filed: April 24, 2019
    Publication date: August 15, 2019
    Applicant: AGC Inc.
    Inventors: Hirofumi TOKUNAGA, Kazutaka Ono, Motoyuki Hirose
  • Publication number: 20190185368
    Abstract: To provide an alkali-free glass, of which the compaction is low, the strain point is high, and the ultraviolet transmittance is high, and which is easy to melt. An alkali-free glass, which comprises, as represented by mol % based on oxides, SiO2 from 65 to 75, Al2O3 from 9 to 15, B2O3 from 0 to 3, MgO from 0 to 12, CaO from 0 to 8, SrO from 0 to 6, and BaO from 0 to 5, wherein MgO+CaO+SrO+BaO is from 12 to 22, and 4.84[Fe2O3]+5.65[Na2O]+4.03[K2O]+4.55[SnO2] is at most 0.55, and of which the compaction is at most 80 ppm.
    Type: Application
    Filed: February 22, 2019
    Publication date: June 20, 2019
    Applicant: AGC Inc.
    Inventors: Hirofumi TOKUNAGA, Kazutaka ONO, Motoyuki HIROSE
  • Publication number: 20190084860
    Abstract: The present invention relates to an alkali-free glass substrate in which when the alkali-free glass substrate is melted, and while holding a temperature at 1400° C., reduced in pressure from an atmospheric pressure to 33.33 kPa at a constant pressure reduction rate for 20 minutes and held at 33.33 kPa for 5 minutes, a diameter of a grown bubble is at least 3 times a diameter of an initial bubble. A bubble having a diameter of 0.1 to 0.3 mm contained in a molten glass at 1400° C. before starting pressure reduction is defined as the initial bubble. A bubble after held at 33.33 kPa for 5 minutes corresponding to the initial bubble is defined as a grown bubble.
    Type: Application
    Filed: September 19, 2018
    Publication date: March 21, 2019
    Applicant: AGC INC.
    Inventors: Motoyuki Hirose, Takashi Enomoto
  • Publication number: 20060068209
    Abstract: To provide a glass for a display substrate which has solved yellowing problems. A glass plate for a display substrate, which contains at least one member selected from the group consisting of Ti, Mn, Zn, Y, Nb, La, Ce and W in an amount of from 0.1 to 10 mass % as calculated as oxides.
    Type: Application
    Filed: November 17, 2005
    Publication date: March 30, 2006
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Motoyuki Hirose, Tetsuya Nakashima, Kei Maeda
  • Patent number: 7008891
    Abstract: A crystallized glass for an optical filter substrate, which has an average linear expansion coefficient ?L of from 95×10?7/° C. to 130×10?7/° C. at from ?30° C. to 70° C. and which has a crystal or the like of Na4-xKxAl4Si4O16 (1<x?4) precipitated therein. Further, a crystallized glass for an optical filter substrate, which comprises from 35 to 60% of SiO2, from 10 to 30% of Al2O3, from 1 to 15% of TiO2+ZrO2, from 4 to 20% of Na2O, from 4 to 20% of K2O, from 0.1 to 10% of CaO+SrO+Bao, from 0 to 10% of MgO, etc., and which has ?L of from 95×10?7/° C. to 130×10?7/° C. and which has a crystal or solid solution precipitated therein.
    Type: Grant
    Filed: December 1, 2003
    Date of Patent: March 7, 2006
    Assignee: Asahi Glass Company, Limited
    Inventors: Tomoyuki Kobayashi, Kei Maeda, Motoyuki Hirose
  • Publication number: 20040116268
    Abstract: A crystallized glass for an optical filter substrate, which has an average linear expansion coefficient &agr;L of from 95×10−7/° C. to 130×10−7/° C. at from −30° C. to 70° C. and which has a crystal or the like of Na4-xKxAl4Si4O16 (1<x≦4) precipitated therein. Further, a crystallized glass for an optical filter substrate, which comprises from 35 to 60% of SiO2, from 10 to 30% of Al2O3, from 1 to 15% of TiO2+ZrO2, from 4 to 20% of Na2O, from 4 to 20% of K20, from 0.1 to 10% of CaO+SrO+Bao, from 0 to 10% of MgO, etc., and which has &agr;L of from 95×10−7/° C. to 130×10−7/° C. and which has a crystal or solid solution precipitated therein.
    Type: Application
    Filed: December 1, 2003
    Publication date: June 17, 2004
    Applicant: ASAHI GLASS COMPANY LIMITED
    Inventors: Tomoyuki Kobayashi, Kei Maeda, Motoyuki Hirose