Patents by Inventor Shigeki Sawamura

Shigeki Sawamura 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: 10994517
    Abstract: A first aspect of the present invention relates to a glass substrate having a content of alkali metal oxides, as represented by molar percentage based on oxides, of 0 to 0.1%, a devitrification-temperature viscosity of 103.2 dPa·s or higher, and an average coefficient of thermal expansion ? at 30 to 220° C. of 7.80 to 9.00 (ppm/° C.). A second aspect of the present invention relates to a glass substrate which is to be used for a support substrate for semiconductor packages, the glass substrate having a content of alkali metal oxides, as represented by molar percentage based on oxides, of 0 to 0.1% and a photoelastic constant of 10 to 26 nm/cm/MPa.
    Type: Grant
    Filed: March 15, 2019
    Date of Patent: May 4, 2021
    Assignee: AGC INC.
    Inventors: Shigeki Sawamura, Kazutaka Ono
  • Patent number: 10882778
    Abstract: A glass substrate includes, as a glass matrix composition as represented by mole percentage based on oxides, SiO2: 55%-75%, Al2O3: 2%-15%, MgO: 0%-10%, CaO: 0%-10%, SrO: 0%-10%, BaO: 0%-15%, ZrO2: 0%-5%, Na2O: 0%-20%, K2O: 5%-30%, and Li2O: 0%-5.0%. The glass substrate has a total content of alkali metal oxides, as represented by mole percentage based on oxides, of 10%-30%, a value obtained by dividing the total content of alkali metal oxides by the content of SiO2 of 0.50 or smaller, a value obtained by dividing the content of Na2O by a value obtained by subtracting the content of Al2O3 from a total content of Na2O and K2O of 0.90 or smaller, and an average coefficient of thermal expansion ?1 at 50° C.-350° C. of 11 ppm/° C.-16 ppm/° C.
    Type: Grant
    Filed: June 26, 2018
    Date of Patent: January 5, 2021
    Assignee: AGC Inc.
    Inventors: Shigeki Sawamura, Kazutaka Ono, Yu Hanawa
  • Patent number: 10515864
    Abstract: The present invention provides a glass substrate in which in a step of sticking a glass substrate and a silicon-containing substrate to each other, bubbles hardly intrude therebetween. The present invention relates to a glass substrate for forming a laminated substrate by lamination with a silicon-containing substrate, having a warpage of 2 ?m to 300 ?m, and an inclination angle due to the warpage of 0.0004° to 0.12°.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: December 24, 2019
    Assignee: AGC Inc.
    Inventors: Yu Hanawa, Shigeki Sawamura, Shuhei Nomura, Kazutaka Ono, Nobuhiko Takeshita, Keisuke Hanashima
  • Publication number: 20190385920
    Abstract: The present invention provides a glass substrate in which in a step of sticking a glass substrate and a silicon-containing substrate to each other, bubbles hardly intrude therebetween. The present invention relates to a glass substrate for forming a laminated substrate by lamination with a silicon-containing substrate, having a warpage of 2 ?m to 300 ?m, and an inclination angle due to the warpage of 0.0004° to 0.12°.
    Type: Application
    Filed: August 29, 2019
    Publication date: December 19, 2019
    Applicant: AGC Inc.
    Inventors: Yu Hanawa, Shigeki Sawamura, Shuhei Nomura, Kazutaka Ono, Nobuhiko Takeshita, Keisuke Hanashima
  • Publication number: 20190210327
    Abstract: A first aspect of the present invention relates to a glass substrate having a content of alkali metal oxides, as represented by molar percentage based on oxides, of 0 to 0.1%, a devitrification-temperature viscosity of 103.2 dPa·s or higher, and an average coefficient of thermal expansion ? at 30 to 220° C. of 7.80 to 9.00 (ppm/° C.). A second aspect of the present invention relates to a glass substrate which is to be used for a support substrate for semiconductor packages, the glass substrate having a content of alkali metal oxides, as represented by molar percentage based on oxides, of 0 to 0.1% and a photoelastic constant of 10 to 26 nm/cm/MPa.
    Type: Application
    Filed: March 15, 2019
    Publication date: July 11, 2019
    Applicant: AGC INC.
    Inventors: Shigeki SAWAMURA, Kazutaka ONO
  • Patent number: 10189739
    Abstract: To provide chemically tempered glass which is less likely to break even if scratched. Chemically tempered glass, which comprises, as represented by mole percentage based on the following oxides, from 56 to 72% of SiO2, from 8 to 20% of Al2O3, from 9 to 25% of Na2O, from 0 to 2% of K2O, and from 0 to 15% of MgO, and which has a surface compressive stress of at least 900 MPa and an internal tensile stress of at most 30 MPa. Glass for chemical tempering, which comprises, as represented by mole percentage based on the following oxides, from 56 to 69% of SiO2, from 8 to 16% of Al2O3, from 9 to 22% of Na2O, from 0 to 1% of K2O, from 5.5 to 14% of MgO, from 0 to 2% of ZrO2, and from 0 to 6% of B2O3.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: January 29, 2019
    Assignee: AGC Inc.
    Inventors: Shusaku Akiba, Shigeki Sawamura, Suguru Murayama, Hiroyuki Ohkawa, Yusuke Kobayashi, Kazutaka Ono, Tetsuya Nakashima
  • Publication number: 20180305241
    Abstract: A glass substrate includes, as a glass matrix composition as represented by mole percentage based on oxides, SiO2: 55%-75%, Al2O3: 2%-15%, MgO: 0%-10%, CaO: 0%-10%, SrO: 0%-10%, BaO: 0%-15%, ZrO2: 0%-5%, Na2O: 0%-20%, K2O: 5%-30%, and Li2O: 0%-5.0%. The glass substrate has a total content of alkali metal oxides, as represented by mole percentage based on oxides, of 10%-30%, a value obtained by dividing the total content of alkali metal oxides by the content of SiO2 of 0.50 or smaller, a value obtained by dividing the content of Na2O by a value obtained by subtracting the content of Al2O3 from a total content of Na2O and K2O of 0.90 or smaller, and an average coefficient of thermal expansion ?1 at 50° C.-350° C. of 11 ppm/° C.-16 ppm/° C.
    Type: Application
    Filed: June 26, 2018
    Publication date: October 25, 2018
    Applicant: Asahi Glass Company, Limited
    Inventors: Shigeki SAWAMURA, Kazutaka Ono, Yu Hanawa
  • Publication number: 20180251395
    Abstract: Provided is an optical glass suitable for an imaging lens or the like used for a vehicle-mounted camera exposed to harsh environment, having a high refractive index and high strength. The optical glass has a strengthened layer at a surface layer, and a depth of the strengthened layer is 1 ?m or more from a surface of the optical glass, and a refractive index (nd) of the optical glass is 1.73 to 2.10.
    Type: Application
    Filed: May 2, 2018
    Publication date: September 6, 2018
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Shusaku AKIBA, Tatsuo NAGASHIMA, Shigeki SAWAMURA
  • Publication number: 20180244559
    Abstract: Provided is an optical glass suitable for an imaging lens or the like used for a vehicle-mounted camera exposed to harsh environment, having a high refractive index and high strength, excellent crack resistance, and a sufficiently low glass transition point and devitrification temperature. In the optical glass, nd is 1.70 or more and 2.10 or less, Tg is 500° C. or more and 630° C. or less, the devitrification temperature is 1300° C. or less, a specific gravity is 4.0 g/cm3 or less, a crack initiation load (CIL) is 20 gf or more, and a fracture toughness value (Kc) is 0.60 MPa·m1/2 or more.
    Type: Application
    Filed: May 1, 2018
    Publication date: August 30, 2018
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Shusaku AKIBA, Tatsuo NAGASHIMA, Shigeki SAWAMURA
  • Publication number: 20180222787
    Abstract: A glass substrate contains, as a glass matrix composition as represented by mole percentage based on oxides, SiO2: 58-75%, Al2O3: 4.5-16%, B2O3: 0-6%, MgO: 0-6%, CaO: 0-6%, SrO: 5-20%, BaO: 5-20%, and MgO+CaO+SrO+BaO: 15-40%. The glass substrate has an alkali metal oxide content of 0-0.1% as represented by mole percentage based on oxides. The glass substrate has an average coefficient of thermal expansion ? of 56-90 (×10?7/° C.) at 50° C.-350° C.
    Type: Application
    Filed: March 29, 2018
    Publication date: August 9, 2018
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Yu HANAWA, Kazutaka Ono, Shigeki Sawamura
  • Publication number: 20180079680
    Abstract: To provide chemically tempered glass which is less likely to break even if scratched. Chemically tempered glass, which comprises, as represented by mole percentage based on the following oxides, from 56 to 72% of SiO2, from 8 to 20% of Al2O3, from 9 to 25% of Na2O, from 0 to 2% of K2O, and from 0 to 15% of MgO, and which has a surface compressive stress of at least 900 MPa and an internal tensile stress of at most 30 MPa. Glass for chemical tempering, which comprises, as represented by mole percentage based on the following oxides, from 56 to 69% of SiO2, from 8 to 16% of Al2O3, from 9 to 22% of Na2O, from 0 to 1% of K2O, from 5.5 to 14% of MgO, from 0 to 2% of ZrO2, and from 0 to 6% of B2O3.
    Type: Application
    Filed: November 30, 2017
    Publication date: March 22, 2018
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Shusaku AKIBA, Shigeki SAWAMURA, Suguru MURAYAMA, Hiroyuki OHKAWA, Yusuke KOBAYASHI, Kazutaka ONO, Tetsuya NAKASHIMA
  • Publication number: 20180082914
    Abstract: The present invention provides a glass substrate in which in a step of sticking a glass substrate and a silicon-containing substrate to each other, bubbles hardly intrude therebetween. The present invention relates to a glass substrate for forming a laminated substrate by lamination with a silicon-containing substrate, having a warpage of 2 ?m to 300 ?m, and an inclination angle due to the warpage of 0.0004° to 0.12°.
    Type: Application
    Filed: November 27, 2017
    Publication date: March 22, 2018
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Yu HANAWA, Shigeki SAWAMURA, Shuhei NOMURA, Kazutaka ONO, Nobuhiko TAKESHITA, Keisuke HANASHIMA
  • Patent number: 9896374
    Abstract: To provide chemically tempered glass which is less likely to break even if scratched. Chemically tempered glass, which comprises, as represented by mole percentage based on the following oxides, from 56 to 72% of SiO2, from 8 to 20% of Al2O3, from 9 to 25% of Na2O, from 0 to 2% of K2O, and from 0 to 15% of MgO, and which has a surface compressive stress of at least 900 MPa and an internal tensile stress of at most 30 MPa. Glass for chemical tempering, which comprises, as represented by mole percentage based on the following oxides, from 56 to 69% of SiO2, from 8 to 16% of Al2O3, from 9 to 22% of Na2O, from 0 to 1% of K2O, from 5.5 to 14% of MgO, from 0 to 2% of ZrO2, and from 0 to 6% of B2O3.
    Type: Grant
    Filed: March 9, 2017
    Date of Patent: February 20, 2018
    Assignee: Asahi Glass Company, Limited
    Inventors: Shusaku Akiba, Shigeki Sawamura, Suguru Murayama, Hiroyuki Ohkawa, Yusuke Kobayashi, Kazutaka Ono, Tetsuya Nakashima
  • Publication number: 20170183254
    Abstract: To provide chemically tempered glass which is less likely to break even if scratched. Chemically tempered glass, which comprises, as represented by mole percentage based on the following oxides, from 56 to 72% of SiO2, from 8 to 20% of Al2O3, from 9 to 25% of Na2O, from 0 to 2% of K2O, and from 0 to 15% of MgO, and which has a surface compressive stress of at least 900 MPa and an internal tensile stress of at most 30 MPa. Glass for chemical tempering, which comprises, as represented by mole percentage based on the following oxides, from 56 to 69% of SiO2, from 8 to 16% of Al2O3, from 9 to 22% of Na2O, from 0 to 1% of K2O, from 5.5 to 14% of MgO, from 0 to 2% of ZrO2, and from 0 to 6% of B2O3.
    Type: Application
    Filed: March 9, 2017
    Publication date: June 29, 2017
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Shusaku Akiba, Shigeki Sawamura, Suguru Murayama, Hiroyuki Ohkawa, Yusuke Kobayashi, Kazutaka Ono, Tetsuya Nakashima
  • Patent number: 9656906
    Abstract: To provide chemically tempered glass which is less likely to break even if scratched. Chemically tempered glass, which comprises, as represented by mole percentage based on the following oxides, from 56 to 72% of SiO2, from 8 to 20% of Al2O3, from 9 to 25% of Na2O, from 0 to 2% of K2O, and from 0 to 15% of MgO, and which has a surface compressive stress of at least 900 MPa and an internal tensile stress of at most 30 MPa. Glass for chemical tempering, which comprises, as represented by mole percentage based on the following oxides, from 56 to 69% of SiO2, from 8 to 16% of Al2O3, from 9 to 22% of Na2O, from 0 to 1% of K2O, from 5.5 to 14% of MgO, from 0 to 2% of ZrO2, and from 0 to 6% of B2O3.
    Type: Grant
    Filed: April 17, 2014
    Date of Patent: May 23, 2017
    Assignee: Asahi Glass Company, Limited
    Inventors: Shusaku Akiba, Shigeki Sawamura, Suguru Murayama, Hiroyuki Ohkawa, Yusuke Kobayashi, Kazutaka Ono, Tetsuya Nakashima
  • Publication number: 20170081240
    Abstract: To provide a method for producing chemically tempered glass, whereby frequency of replacement of the molten salt can be reduced. A method for producing chemically tempered glass, which comprises repeating ion exchange treatment of immersing glass in a molten salt, wherein the glass comprises, as represented by mole percentage, from 61 to 77% of SiO2, from 1 to 18% of Al2O3, from 3 to 15% of MgO, from 0 to 5% of CaO, from 0 to 4% of ZrO2, from 8 to 18% of Na2O and from 0 to 6% of K2O; SiO2+Al2O3 is from 65 to 85%; MgO+CaO is from 3 to 15%; and R calculated by the following formula by using contents of the respective components, is at least 0.66: R=0.029×SiO2+0.021×Al2O3+0.016×MgO?0.004×CaO+0.016×ZrO2+0.029×Na2O+0×K2O?2.
    Type: Application
    Filed: December 6, 2016
    Publication date: March 23, 2017
    Applicant: Asahi Glass Company, Limited
    Inventors: Jun ENDO, Shusaku AKIBA, Kazutaka ONO, Shigeki SAWAMURA
  • Publication number: 20150307388
    Abstract: A glass for chemical tempering is provided. The glass contains as represented by mole percentage based on the following oxides, from 61 to 77% of SiO2, from 11 to 18% of Al2O3, from 3 to 15% of MgO, from 0 to 0.5% of CaO, from 0 to 4% of ZrO2, from 8 to 18% of Na2O and from 0 to 1.9% of K2O; wherein an R value calculated by the following formula by using contents of the respective components, is at least 0.66: R=0.029×SiO2+0.021×Al2O3+0.016×MgO?0.004×CaO+0.016×ZrO2+0.029×Na2O+0×K2O?2.
    Type: Application
    Filed: July 10, 2015
    Publication date: October 29, 2015
    Applicant: Asahi Glass Company, Limited
    Inventors: Jun ENDO, Shusaku Akiba, Kazutaka Ono, Shigeki Sawamura
  • Publication number: 20150147538
    Abstract: A chemically strengthened glass sheet, which has front and back main surfaces and an edge surface between the front and back main surfaces, has undergone a chemical strengthening treatment and has an approximately rectangular shape, in which the chemically strengthened glass sheet has a surface compressive stress of 800 MPa or more, and an internal tensile stress of 42 MPa or less.
    Type: Application
    Filed: November 25, 2014
    Publication date: May 28, 2015
    Applicant: Asahi Glass Company, Limited
    Inventors: Masayuki ISHIMARU, Hiroyuki OKAWA, Syusaku AKIBA, Shigeki SAWAMURA, Kazutaka ONO, Tetsuya NAKASHIMA, Izuru KASHIMA, Yusuke KOBAYASHI, Suguru MURAYAMA, Aya YAMAMOTO
  • Publication number: 20150038315
    Abstract: To provide a method for producing chemically tempered glass, whereby frequency of replacement of the molten salt can be reduced. A method for producing chemically tempered glass, which comprises repeating ion exchange treatment of immersing glass in a molten salt, wherein the glass comprises, as represented by mole percentage, from 61 to 77% of SiO2, from 1 to 18% of Al2O3, from 3 to 15% of MgO, from 0 to 5% of CaO, from 0 to 4% of ZrO2, from 8 to 18% of Na2O and from 0 to 6% of K2O; SiO2+Al2O3 is from 65 to 85%; MgO+CaO is from 3 to 15%; and R calculated by the following formula by using contents of the respective components, is at least 0.66: R=0.029×SiO2+0.021×Al2O3+0.016×MgO?0.004×CaO+0.016×ZrO2+0.029×Na2O+0×K2O?2.
    Type: Application
    Filed: October 21, 2014
    Publication date: February 5, 2015
    Applicant: Asahi Glass Company, Limited
    Inventors: Jun Endo, Shusaku Akiba, Kazutaka Ono, Shigeki Sawamura
  • Publication number: 20140226090
    Abstract: To provide chemically tempered glass which is less likely to break even if scratched. Chemically tempered glass, which comprises, as represented by mole percentage based on the following oxides, from 56 to 72% of SiO2, from 8 to 20% of Al2O3, from 9 to 25% of Na2O, from 0 to 2% of K2O, and from 0 to 15% of MgO, and which has a surface compressive stress of at least 900 MPa and an internal tensile stress of at most 30 MPa. Glass for chemical tempering, which comprises, as represented by mole percentage based on the following oxides, from 56 to 69% of SiO2, from 8 to 16% of Al2O3, from 9 to 22% of Na2O, from 0 to 1% of K2O, from 5.5 to 14% of MgO, from 0 to 2% of ZrO2, and from 0 to 6% of B2O3.
    Type: Application
    Filed: April 17, 2014
    Publication date: August 14, 2014
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Shusaku AKIBA, Shigeki SAWAMURA, Suguru MURAYAMA, Hiroyuki OHKAWA, Yusuke KOBAYASHI, Kazutaka ONO, Tetsuya NAKASHIMA