Patents by Inventor Kenji Imakita

Kenji Imakita 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: 12281039
    Abstract: The present invention relates to a chemically strengthened glass satisfying A1 [MPa] of 600 or more, A2 [MPa] of 50 or more, B1 [?m] of 6 or less, B2 [?m] of 10% or more of t [?m], C [MPa] of ?30 or less, and A1/B1 [MPa/?m] of 100 or more when the chemically strengthened glass has a thickness t [?m] and a profile of a stress value [MPa] at a depth×[?m] from a glass surface is approximated by an error least-squares method in a region of 0<x<3t/8 using the following function while defining a compressive stress as positive and a tensile stress as negative: A1erfc(x/B1)+A2erfc(x/B2)+C, in which erfc is a complementary error function, and relations of A1>A2 and B1<B2 are satisfied.
    Type: Grant
    Filed: May 12, 2023
    Date of Patent: April 22, 2025
    Assignee: AGC Inc.
    Inventors: Kenji Imakita, Suguru Murayama, Izuru Kashima, Kazuki Kanehara
  • Patent number: 12246988
    Abstract: An inference method includes inferring a value that includes a stress value in a region located 50 ?m or shallower from a surface of a chemically strengthened glass, by receiving as input at least a temperature and a time used upon chemical strengthening, and stress values at three or more different depth positions 20 ?m or deeper from the surface of the chemically strengthened glass that has been obtained by chemically strengthening a glass having a thickness of 0.2 mm or greater with the temperature and the time.
    Type: Grant
    Filed: May 13, 2022
    Date of Patent: March 11, 2025
    Assignee: AGC Inc.
    Inventors: Satoshi Ogami, Kenji Imakita
  • 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
  • Publication number: 20250066244
    Abstract: A glass for chemical strengthening including, in mol % in terms of oxides: 50% to 65% of SiO2; 15% to 25% of Al2O3; 2% to 10% of B2O3; 0% to 15% of P2O5; 0% to 15% of ZnO; 0% to 10% of MgO; 0% to 15% of CaO; 3% to 15% of Li2O; 2.5% to 15% of Na2O; 0% to 5% of K2O; 0% to 5% of ZrO2; 0% to 5% of Y2O3; and 0% to 5% of TiO2, in which [Li2O]/([Na2O]+[K2O]) is 0.5 to 3.5, and [Al2O3]+[Li2O] is 27% to 35%, provided that in the formulas, [ ] indicates a content of each component described in the parentheses in mol % in terms of oxides.
    Type: Application
    Filed: November 13, 2024
    Publication date: February 27, 2025
    Applicant: AGC Inc.
    Inventors: Kenji IMAKITA, Shusaku AKIBA
  • Publication number: 20250026676
    Abstract: A chemically strengthened glass sheet in which a value of SB/(SA×t) is 5.0 mm?1 or more, where SA (MPa·?m) is an integrated value of a 5 compressive stress from a surface of the glass sheet to a depth of 10 ?m, SB (MPa·?m) is an integrated value of a compressive stress from the depth of 10 ?m to DOL which is a depth at which the compressive stress is zero, and t (mm) is a thickness of the glass sheet.
    Type: Application
    Filed: October 1, 2024
    Publication date: January 23, 2025
    Applicant: AGC Inc.
    Inventors: Takumi UMADA, Kenji IMAKITA, Yusuke ARAI, Qing LI
  • Patent number: 12195387
    Abstract: A chemically strengthened glass article in which a compressive stress value on a first surface is 400 MPa or more, a compressive stress value at a depth DB with a maximum compressive stress value in the range (0.05×t)?(0.15×t) ?m is larger than the compressive stress value at a depth DA with a minimum compressive stress value in the range from the first surface to DB, a tensile stress value at a depth of (0.5×t) ?m is 125 MPa or less, and a compressive stress layer depth is (0.23×t) ?m or more.
    Type: Grant
    Filed: June 2, 2022
    Date of Patent: January 14, 2025
    Assignee: AGC Inc.
    Inventors: Kazuki Kanehara, Kenji Imakita
  • Patent number: 12168626
    Abstract: The present invention relates to a chemically strengthened glass having a sheet shape, having a compressive stress layer on a glass surface, having a compressive stress value on the glass surface of 800 MPa or more, having a sheet thickness (t) of 100 ?m or more, having a depth of the compressive stress layer (DOL) of (t×0.1) ?m or more, and satisfying: CSB>CSA>0, where DB is a depth in a range of 10 ?m or more and not more than DOL from the glass surface, at which a compressive stress value is maximum; CSB is the compressive stress value at the depth DB; D? is a depth in a range of equal to or less than DB from the glass surface, at which a compressive stress value is minimum; and CSA is the compressive stress value at the depth DA.
    Type: Grant
    Filed: July 1, 2021
    Date of Patent: December 17, 2024
    Assignee: AGC Inc.
    Inventors: Kazuki Kanehara, Eriko Maeda, Takumi Umada, Kenji Imakita
  • Publication number: 20240391826
    Abstract: A chemically strengthened glass in which a base glass composition of the chemically strengthened glass includes, in terms of molar percentage based on oxides: 55% to 75% of SiO2; 8% to 20% of Al2O3; 3% to 15% of Li2O; 1% to 5% of Na2O; 0% to 3% of K2O; 0% to 10% of MgO; 0% to 3% of Y2O3; 0% to 3% of ZrO2; 0% to 10% of CaO; 0% to 5% of SrO; 0% to 5% of ZnO; 0% to 3% of TiO2; 0% to 1% of SnO2; 0% to 5% of P2O5; and 0% to 10% of B2O3, a ratio [ZrO2]/([Y2O3]+[ZrO2]) is 0 or more and 0.7 or less, and the total content of Y2O3 and ZrO2 is 0.0% or more and 3.0% or less, and a value of 1nW represented by the Formula (1) is 10 or more and 20 or less.
    Type: Application
    Filed: August 2, 2024
    Publication date: November 28, 2024
    Applicant: AGC Inc.
    Inventors: Hiroyuki HIJIYA, Takato KAJIHARA, Eriko MAEDA, Shusaku AKIBA, Chieko SUZUKI, Kenji IMAKITA
  • Patent number: 12145879
    Abstract: The present invention relates to a chemically strengthened glass sheet in which a value of SB/(SA×t) is 5.0 mm?1 or more, where SA (MPa·?m) is an integrated value of a compressive stress from a surface of the glass sheet to a depth of 10 ?m, SB (MPa·?m) is an integrated value of a compressive stress from the depth of 10 ?m to DOL which is a depth at which the compressive stress is zero, and t (mm) is a thickness of the glass sheet.
    Type: Grant
    Filed: June 4, 2021
    Date of Patent: November 19, 2024
    Assignee: AGC Inc.
    Inventors: Takumi Umada, Kenji Imakita, Yusuke Arai, Qing Li
  • Publication number: 20240190761
    Abstract: A plate-like chemically strengthened glass having a compression stress layer on the surface of the glass, wherein the compressive stress value (CS0) at the glass surface of is 500 MPa or more, the plate thickness (t) is 400 ?m or more, the compressive stress depth of layer (DOL) is (t×0.15) ?m or more, the compressive stress values (CS1) and (CS2) when the depth from the glass surface is ¼ and ½, respectively, are 50 MPa or more, m1 expressed by {m1=(CS1?CS2/(DOL/4?DOL/2)} is ?1.5 MPa/?m or more, m2 expressed by {m2=(CS2/(DOL/2?DOL)} is 0 MPa/?m or less, and m2 is less than m1.
    Type: Application
    Filed: February 27, 2024
    Publication date: June 13, 2024
    Applicant: AGC Inc.
    Inventors: Kenji IMAKITA, Suguru MURAYAMA
  • Publication number: 20230278916
    Abstract: The present invention relates to a chemically strengthened glass satisfying A1 [MPa] of 600 or more, A2 [MPa] of 50 or more, B1 [?m] of 6 or less, B2 [?m] of 10% or more of t [?m], C [MPa] of ?30 or less, and A1/B1 [MPa/?m] of 100 or more when the chemically strengthened glass has a thickness t [?m] and a profile of a stress value [MPa] at a depth×[?m] from a glass surface is approximated by an error least-squares method in a region of 0<x<3t/8 using the following function while defining a compressive stress as positive and a tensile stress as negative: A1erfc(x/B1)+A2erfc(x/B2)+C, in which erfc is a complementary error function, and relations of A1>A2 and B1<B2 are satisfied.
    Type: Application
    Filed: May 12, 2023
    Publication date: September 7, 2023
    Applicant: AGC Inc.
    Inventors: Kenji IMAKITA, Suguru MURAYAMA, Izuru KASHIMA, Kazuki KANEHARA
  • 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: 11718557
    Abstract: The present invention relates to a chemically strengthened glass satisfying A1 [MPa] of 600 or more, A2 [MPa] of 50 or more, B1 [?m] of 6 or less, B2 [?m] of 10% or more of t [?m], C [MPa] of ?30 or less, and A1/B1 [MPa/?m] of 100 or more when the chemically strengthened glass has a thickness t [?m] and a profile of a stress value [MPa] at a depth x [?m] from a glass surface is approximated by an error least-squares method in a region of 0<x<3t/8 using the following function while defining a compressive stress as positive and a tensile stress as negative: A1 erfc(x/B1)+A2 erfc(x/B2)+C, in which erfc is a complementary error function, and relations of A1>A2 and B1<B2 are satisfied.
    Type: Grant
    Filed: March 11, 2022
    Date of Patent: August 8, 2023
    Assignee: AGC Inc.
    Inventors: Kenji Imakita, Suguru Murayama, Izuru Kashima, Kazuki Kanehara
  • Publication number: 20230234885
    Abstract: A plate-like chemically strengthened glass having a compression stress layer on the surface of the glass, wherein the compressive stress value (CS0) at the glass surface of is 500 MPa or more, the plate thickness (t) is 400 µm or more, the compressive stress depth of layer (DOL) is (t × 0.15) µm or more, the compressive stress values (CS1) and (CS2) when the depth from the glass surface is ¼ and ½, respectively, are 50 MPa or more, m1 expressed by {m1 = (CS1 - CS2/(DOL/4 - DOL/2)} is -1.5 MPa/µm or more, m2 expressed by {m2 = (CS2/(DOL/2 - DOL)} is 0 MPa/µm or less, and m2 is less than m1.
    Type: Application
    Filed: March 16, 2023
    Publication date: July 27, 2023
    Applicant: AGC Inc.
    Inventors: Kenji IMAKITA, Suguru MURAYAMA
  • Patent number: 11639308
    Abstract: A plate-like chemically strengthened glass having a compression stress layer on the surface of the glass, wherein the compressive stress value (CS0) at the glass surface of is 500 MPa or more, the plate thickness (t) is 400 ?m or more, the compressive stress depth of layer (DOL) is (t×0.15) ?m or more, the compressive stress values (CS1) and (CS2) when the depth from the glass surface is ¼ and ½, respectively, are 50 MPa or more, m1 expressed by {m1=(CS1?CS2/(DOL/4?DOL/2)} is ?1.5 MPa/?m or more, m2 expressed by {m2=(CS2/(DOL/2?DOL)} is 0 MPa/?m or less, and m2 is less than m1.
    Type: Grant
    Filed: December 11, 2019
    Date of Patent: May 2, 2023
    Assignee: AGC Inc.
    Inventors: Kenji Imakita, Suguru Murayama
  • Publication number: 20230021473
    Abstract: The present invention relates to a glass including, in terms of mole percentage based on oxides: SiO2 in an amount of 45% to 65%; Al2O3 in an amount of 18% to 30%; Li2O in an amount of 7% to 15%; one or more selected from Y2O3 and La2O3 in a total amount of 0% to 10%; P2O5 in an amount of 0% to 10%; B2O3 in an amount of 0% to 10%; and ZrO2 in an amount of 0% to 4%, and satisfying the following expression: [Al2O3]—[R2O]—[RO]—[P2O5]>0, provided that, in terms of mole percentage based on oxides, a content of Al2O3 is defined as [Al2O3], a content of P2O5 is defined as [P2O5], a total content of alkali metal oxides is defined as [R2O], and a total content of alkali earth metal oxides is defined as [RO].
    Type: Application
    Filed: September 22, 2022
    Publication date: January 26, 2023
    Applicant: AGC Inc.
    Inventors: Takumi UMADA, Kenji IMAKITA, Shusaku AKIBA, Yusaku MATSUO
  • Publication number: 20220380250
    Abstract: An inference method includes inferring a value that includes a stress value in a region located 50 ?m or shallower from a surface of a chemically strengthened glass, by receiving as input at least a temperature and a time used upon chemical strengthening, and stress values at three or more different depth positions 20 ?m or deeper from the surface of the chemically strengthened glass that has been obtained by chemically strengthening a glass having a thickness of 0.2 mm or greater with the temperature and the time.
    Type: Application
    Filed: May 13, 2022
    Publication date: December 1, 2022
    Applicant: AGC Inc.
    Inventors: Satoshi OGAMI, Kenji IMAKITA
  • Publication number: 20220289625
    Abstract: The present invention relates to a chemically strengthened glass article in which a compressive stress value on a first surface is 400 MPa or more, with a glass thickness of t (?m), the compressive stress value at the depth DB where the compressive stress value is maximum in the range where the depth from the first surface is (0.05×t)-(0.15×t) ?m is larger than the compressive stress value at the depth DA where the compressive stress value is minimum in the range from the first surface to the depth DB, the tensile stress value at a depth (0.5×t) ?m from the first surface is 125 MPa or less, and a compressive stress layer depth is (0.23×t) ?m or more.
    Type: Application
    Filed: June 2, 2022
    Publication date: September 15, 2022
    Applicant: AGC Inc.
    Inventors: Kazuki KANEHARA, Kenji IMAKITA
  • Publication number: 20220204400
    Abstract: The present invention relates to a chemically strengthened glass satisfying A1 [MPa] of 600 or more, A2 [MPa] of 50 or more, B1 [?m] of 6 or less, B2 [?m] of 10% or more of t [?m], C [MPa] of ?30 or less, and A1/B1 [MPa/?m] of 100 or more when the chemically strengthened glass has a thickness t [?m] and a profile of a stress value [MPa] at a depth x [?m] from a glass surface is approximated by an error least-squares method in a region of 0<x<3t/8 using the following function while defining a compressive stress as positive and a tensile stress as negative: A1erfc(x/B1)+A2erfc(x/B2)+C, in which erfc is a complementary error function, and relations of A1>A2 and B1<B2 are satisfied.
    Type: Application
    Filed: March 11, 2022
    Publication date: June 30, 2022
    Applicant: AGC Inc.
    Inventors: Kenji IMAKITA, Suguru MURAYAMA, Izuru KASHIMA, Kazuki KANEHARA
  • Publication number: 20220135466
    Abstract: The present invention relates to a glass including, in mole percentage on an oxide basis: 60-75% of SiO2; 8-20% of Al2O3; 5-16% of Li2O; and 2-15% of one or more kinds of Na2O and K2O in total, in which a ratio PLi of the content of Li2O to a total content of Li2O, Na2O, and K2O is 0.40 or more, and a total content of MgO, CaO, SrO, BaO, and ZnO is 0-10%.
    Type: Application
    Filed: January 11, 2022
    Publication date: May 5, 2022
    Applicant: AGC Inc.
    Inventors: Eriko MAEDA, Kenji IMAKITA, Kazuki KANEHARA, Akihisa MINOWA