Patents by Inventor Akio Koike

Akio Koike 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: 12240779
    Abstract: The present invention provides crystallized glass of three-dimensional shape for easily producing chemically strengthened glass of three-dimensional shape that resists damage and has exceptional transparency. This crystallized glass of three-dimensional shape: contains crystals; has light transmittance in terms of a thickness of 0.8 mm of 80% or higher; and contains 45-74% SiO2, 1-30% Al2O3, 1-25% Li2O, 0-10% Na2O, 0-5% K2O, a total of 0-15% of SnO2 and/or ZrO2, and 0-12% P2O5, these amounts expressing the oxide-based mass percentage.
    Type: Grant
    Filed: November 12, 2021
    Date of Patent: March 4, 2025
    Assignee: AGC Inc.
    Inventors: Qing Li, Kenji Imakita, Akio Koike, Eriko Maeda
  • Patent number: 12024464
    Abstract: The purpose of the present invention is to provide a glass for chemical strengthening that exhibits a high strength after chemical strengthening and is resistant to devitrification. The present invention relates to a glass for chemical strengthening that contains, expressed as mol % on an oxide basis, 55 to 70% SiO2, 10 to 25% Al2O3, 1 to 20% Li2O, 0 to 8% CaO, 0 to 8% SrO, and 0 to 5% ZrO2, in which the sum of the contents of CaO and SrO is 1.5 to 10%, the sum of the contents of Na2O and K2O is 3 to 11%, and the value X given by the formula ([Li2O]+[K2O])/[Al2O3] is 0.1 to 1.1.
    Type: Grant
    Filed: September 28, 2020
    Date of Patent: July 2, 2024
    Assignee: AGC Inc.
    Inventors: Suguru Murayama, Akio Koike
  • Patent number: 11731901
    Abstract: The purpose of the present invention is to provide a chemically strengthened glass having excellent transparency and strength and being scratch resistant. The present invention pertains to a chemically strengthened glass that: has a compressive stress layer on the surface thereof; has a visible light transmittance of at least 70% when the thickness thereof is converted to 0.8 mm; has a surface compressive stress of at least 600 MPa; has a compressive stress depth of at least 80 ?m; and contains a ?-spodumene.
    Type: Grant
    Filed: January 21, 2020
    Date of Patent: August 22, 2023
    Assignee: AGC Inc.
    Inventors: Qing Li, Kenji Imakita, Akio Koike, Eriko Maeda
  • Patent number: 11718556
    Abstract: The present invention pertains to a glass for strengthening, that: has an average transmittance of at least 70% when converted to a thickness of 0.8 mm at a wavelength of 380-780 nm; has a haze value of no more than 0.7% when converted to a thickness of 0.8 mm in a C light source; has a Young's modulus of at least 85 GPa; has a fracture toughness value of at least 0.90 MPa·m1/2; a thermal conductivity at 20° C. of at least 1.3 W/m·K; and comprises a lithium aluminosilicate crystallized glass.
    Type: Grant
    Filed: January 21, 2020
    Date of Patent: August 8, 2023
    Assignee: AGC Inc.
    Inventors: Qing Li, Akio Koike, Eriko Maeda
  • Patent number: 11274058
    Abstract: A crystallized glass that: has a visible light transmittance of at least 85% when the thickness thereof is converted to 0.8 mm; has a haze value of no more than 1.0% when the thickness thereof is converted to 0.8 mm; contains, in terms of mass % on an oxide basis, 58%-70% SiO2, 15%-30% Al2O3, 2%-10% Li2O, 0%-5% Na2O, 0%-2% K2O, 0%-1.8% SrO, 0%-2% BaO, 0.5%-6% SnO2, 0.5%-6% ZrO2, and 0%-6% P2O5; has a total SrO and BaO content of 0.1%-3%; and has a total Na2O and K2O content of 1%-5%.
    Type: Grant
    Filed: January 21, 2020
    Date of Patent: March 15, 2022
    Assignee: AGC Inc.
    Inventors: Qing Li, Akio Koike, Kazuki Kanehara
  • Patent number: 11028015
    Abstract: A glass ball has a density of 2.3 to 3.2 g/cm3, a Young's modulus of 60 to 150 GPa, and an average coefficient of thermal expansion at 50 to 350° C. being 40×10?7 to 120×10?7/° C. The glass ball is formed of a glass material including, as represented by mole percentage based on oxides, 30 to 75 mol % of SiO2, 2 to 30 mol % of Al2O3, and 5 to 25 mol % of R2O, where R is at least one kind selected from Li, Na and K. The glass ball includes a compressive stress layer in a surface thereof.
    Type: Grant
    Filed: December 30, 2019
    Date of Patent: June 8, 2021
    Assignee: AGC Inc.
    Inventors: Akio Koike, Makoto Katsuta, Suguru Murayama, Kenji Imakita
  • Patent number: 10865134
    Abstract: A wavelength-selective transmissive glass has a light transmittance Tmore than 315 nm and 400 nm or less at a wavelength of more than 315 nm and 400 nm or less represented by the formula shown below of 1% or more in terms of a plate thickness of 6 mm and a light transmittance T315 nm or less at a wavelength of 315 nm or less represented by the formula shown below of 60% or less in terms of a plate thickness of 6 mm. Ak is a weighting factor at a wavelength k (nm) for calculating T (light transmittance) defined in ISO-9050:2003, and Tk is a transmittance at the wavelength k (nm) in terms of a plate thickness of 6 mm: Tmore than 315 nm and 400 nm or less=(?k=more than 315400Ak×Tk)/(?k=more than 315400Ak) T315 nm or less=(?k=300315Ak×Tk)/(?k=300315Ak).
    Type: Grant
    Filed: June 1, 2018
    Date of Patent: December 15, 2020
    Assignees: AGC Inc., TSUBOTA LABORATORY, INC.
    Inventors: Kensuke Nagai, Tetsuya Nakashima, Yutaka Kuroiwa, Hiroyuki Hijiya, Masamichi Tanida, Akio Koike, Manabu Nishizawa, Kazuo Tsubota, Toshihide Kurihara, Hidemasa Torii
  • Publication number: 20200156994
    Abstract: The present invention pertains to a glass for strengthening, that: has an average transmittance of at least 70% when converted to a thickness of 0.8 mm at a wavelength of 380-780 nm; has a haze value of no more than 0.7% when converted to a thickness of 0.8 mm in a C light source; has a Young's modulus of at least 85 GPa; has a fracture toughness value of at least 0.90 MPa·m1/2; a thermal conductivity at 20° C. of at least 1.3 W/m·K; and comprises a lithium aluminosilicate crystallized glass.
    Type: Application
    Filed: January 21, 2020
    Publication date: May 21, 2020
    Applicant: AGC Inc.
    Inventors: Qing Li, Akio Koike, Eriko Maeda
  • Publication number: 20200102241
    Abstract: The present invention pertains to: a tempered glass which is obtained by physically strengthening a glass having an average coefficient of thermal expansion at 50-350° C. of (20×10?7)-(50×10?7)/)° C. and a glass transition temperature of 560° C. or higher; and a tempered glass obtained by physically strengthening a glass containing, in mole percent on an oxide basis, 0-4% of R2O (R2O is defined in the specification) and 5-25% of B2O3.
    Type: Application
    Filed: December 4, 2019
    Publication date: April 2, 2020
    Applicant: AGC Inc.
    Inventors: Junko MIYASAKA, Akio Koike, Hiroyuki Yamamoto
  • Publication number: 20190352227
    Abstract: A chemically strengthened glass includes a compressive stress layer. A compressive stress is 200 MPa or more at a surface of the chemically strengthened glass. A depth in the compressive stress layer at which the compressive stress is 50 MPa from the surface is 50 ?m or more. A depth in the compressive stress layer at which the compressive stress is 30 MPa from the surface is 60 ?m or more. A critical stress intensity factor KIC is 0.75 MPa·m1/2 or more.
    Type: Application
    Filed: August 5, 2019
    Publication date: November 21, 2019
    Applicant: AGC Inc.
    Inventors: Akio Koike, Yusuke Kobayashi
  • Publication number: 20180229477
    Abstract: A glass-resin composite including a glass sheet and a resin film, in which: the resin film is provided all over at least one of main surfaces of the glass sheet; the glass sheet is of a chemically strengthened glass having a compressive stress layer in each of surface layers of the main surfaces and edge surfaces; the glass sheet has a sheet thickness t1 of 0.05-0.25 mm; and the sheet thickness t1, a thickness t2 of the resin film, and yield stress P of the resin film satisfy a relation of {t1 (mm)×4(N/mm2)<t2 (mm)×P(N/mm2)}.
    Type: Application
    Filed: April 16, 2018
    Publication date: August 16, 2018
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Akio Koike, Junichi Kakuta, Hideaki Hayashi
  • Patent number: 9963379
    Abstract: The present invention relates to an alkali-free glass substrate, having a strain point of 680° C. or higher, a Young's modulus of 78 GPa or greater, an UV transmittance at a wavelength of 300 nm of from 40% to 85% in terms of 0.5 mm thickness, an in-plane distribution of the UV transmittance at a wavelength of 300 nm in a G6-sized substrate of 1% or less in terms of 0.5 mm thickness, an average cooling rate around the glass transition point obtained according to a rate cooling method of 400° C./min or lower, and an in-plane distribution of the average cooling rate of 40° C./min or less.
    Type: Grant
    Filed: May 25, 2017
    Date of Patent: May 8, 2018
    Assignee: ASAHI GLASS COMPANY, LIMITED
    Inventors: Hirofumi Tokunaga, Akio Koike, Masaya Kunigita
  • Patent number: 9748601
    Abstract: A method of manufacturing a lithium ion conductive solid electrolyte includes (a) a step of preparing an object to be processed including a crystalline material, that includes alkali metal other than lithium and whose ionic conductivity at room temperature is greater than or equal to 1×10?13 S/cm; and (b) a step of performing an ion-exchange process on the object to be processed in molten salt including lithium ions.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: August 29, 2017
    Assignee: ASAHI GLASS COMPANY, LIMITED
    Inventors: Tomoyuki Tsujimura, Akio Koike, Syusaku Akiba
  • Patent number: 9708211
    Abstract: The present invention relates to an alkali-free glass substrate, having a strain point of 680° C. or higher, a Young's modulus of 78 GPa or greater, an UV transmittance at a wavelength of 300 nm of from 40% to 85% in terms of 0.5 mm thickness, an in-plane distribution of the UV transmittance at a wavelength of 300 nm in a G6-sized substrate of 1% or less in terms of 0.5 mm thickness, an average cooling rate around the glass transition point obtained according to a rate cooling method of 400° C./min or lower, and an in-plane distribution of the average cooling rate of 40° C./min or less.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: July 18, 2017
    Assignee: ASAHI GLASS COMPANY, LIMITED
    Inventors: Hirofumi Tokunaga, Akio Koike, Masaya Kunigita
  • Patent number: 9670087
    Abstract: The present invention relates to an alkali-free glass having a strain point of 725° C. or higher, an average thermal expansion coefficient at from 50 to 300° C. of from 30×10?7 to 40×107/° C., a temperature T2 at which a glass viscosity is 102 dPa·s of 1,710° C. or lower, and a temperature T4 at which a glass viscosity is 104 dPa·s of 1,320° C. or lower, the alkali-free glass including, in terms of mol % on the basis of oxides, SiO2: 66 to 70, Al2O3: 12 to 15, B2O3: 0 to 1.5, MgO: more than 9.5 and 13 or less, CaO: 4 to 9, SrO: 0.5 to 4.5, BaO: 0 to 1, and ZrO2: 0 to 2, in which MgO+CaO+SrO+BaO is from 17 to 21, MgO/(MgO+CaO+SrO+BaO) is 0.4 or more, MgO/(MgO+CaO) is 0.4 or more, MgO/(MgO+SrO) is 0.6 or more, and the alkali-free glass does not substantially contain an alkali metal oxide.
    Type: Grant
    Filed: September 18, 2015
    Date of Patent: June 6, 2017
    Assignee: ASAHI GLASS COMPANY, LIMITED
    Inventors: Tomoyuki Tsujimura, Manabu Nishizawa, Akio Koike
  • Patent number: 9663395
    Abstract: The present invention relates to an alkali-free glass having a strain point of from 680 to 735° C., an average thermal expansion coefficient at from 50 to 350° C. of from 30×10?7 to 43×10?7/° C., and a specific gravity of 2.60 or less, and containing, indicated by mol % on the basis of oxides, SiO2 65 to 69%, Al2O3 11.5 to 14%, B2O3 3 to 6.5%, MgO 1 to 5%, CaO 7.5 to 12%, SrO 0 to 1%, BaO 0.5 to 6%, and ZrO2 0 to 2%.
    Type: Grant
    Filed: December 8, 2014
    Date of Patent: May 30, 2017
    Assignee: ASAHI GLASS COMPANY, LIMITED
    Inventors: Hirofumi Tokunaga, Manabu Nishizawa, Akio Koike
  • Patent number: 9540273
    Abstract: The present invention relates to a non-alkali glass having a strain point of from 710° C. to lower than 725° C., an average thermal expansion coefficient at from 50 to 300° C. of from 30×10?7 to 43×10?7/° C., a temperature T2 at which glass viscosity reaches 102 dPa·s of 1710° C. or lower, a temperature T4 at which the glass viscosity reaches 104 dPa·s of 1320° C. or lower, and containing, indicated by mol % on the basis of oxides, SiO2 66 to 70, Al2O3 12 to 14, B2O3 exceeding 0 to 1.5, MgO exceeding 9.5 to 13 (or 5 to 9.5), CaO 4 to 9 (or 4 to 11), SrO 0.5 to 4.5, BaO 0 to 0.5 and ZrO 0 to 2.
    Type: Grant
    Filed: November 17, 2015
    Date of Patent: January 10, 2017
    Assignee: ASAHI GLASS COMPANY, LIMITED
    Inventors: Hirofumi Tokunaga, Tomoyuki Tsujimura, Manabu Nishizawa, Akio Koike
  • Publication number: 20160355431
    Abstract: A chemically strengthened glass contains, as expressed by mass percentage based on oxides, 60% to 75% of SiO2, 3% to 9% of Al2O3, 2% to 10% of MgO, 3% to 10% of CaO, 10% to 18% of Na2O, at most 4% of K2O, 0% to 3% of ZrO2, 0% to 0.3% of TiO2, and 0.02% to 0.4% of SO3. It has a temperature T2 at which a viscosity of a glass melt is 100 dPa·sec of 1530° C. or lower. In a chemically strengthened main surface thereof, it has a depth of a compressive stress layer of 8 ?m or more and a surface compressive stress of 500 MPa or more.
    Type: Application
    Filed: June 10, 2016
    Publication date: December 8, 2016
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Shusaku Akiba, Akio Koike, Junichiro Kase, Shuji Yamazaki
  • Publication number: 20160355430
    Abstract: A glass is a glass sheet containing, as expressed by mass percentage based on oxides, 63 to 75% of SiO2, 3 to 12% of Al2O3, 3 to 10% of MgO, 0.5 to 10% of CaO, 0 to 3% of SrO, 0 to 3% of BaO, 10 to 18% of Na2O, 0 to 8% of K2O, 0 to 3% of ZrO2, and 0.005 to 0.25% of Fe2O3. The glass has a temperature (T2) at which a viscosity thereof reaches 102 dPa·s of 1525° C. or lower. In the glass, R2O/Al2O3 is 2.0 or more and 4.6 or less (in the formula, the R2O is Na2O+K2O).
    Type: Application
    Filed: June 10, 2016
    Publication date: December 8, 2016
    Applicant: Asahi Glass Company, Limited
    Inventors: Shuji YAMAZAKI, Akio Koike, Junichiro Kase, Shusaku Akiba, Junko Miyasaka, Seiki Ohara
  • Patent number: 9505650
    Abstract: The present invention relates to a non-alkali glass substrate, having a strain point of 685° C. or higher and 750° C. or lower, an average thermal expansion coefficient at 50 to 350° C. of from 35×10?7 to 43×10?7/° C., a specific gravity of from 2.50 to 2.80, a photoelastic constant of 25 nm/MPa/cm or more and less than 29 nm/MPa/cm, and a temperature (T4) at which viscosity reaches 104 dPa·s of 1,250° C. or higher and lower than 1,350° C., and having a prescribed composition.
    Type: Grant
    Filed: December 2, 2013
    Date of Patent: November 29, 2016
    Assignee: ASAHI GLASS COMPANY, LIMITED
    Inventors: Manabu Nishizawa, Akio Koike, Hirofumi Tokunaga