Patents by Inventor Setsuro Ito

Setsuro Ito 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: 10370281
    Abstract: Provides is low scattering silica glass suitable as a material of an optical communication fiber. Silica glass has a fictive temperature of at least 1,000° C. and a void radius of at most 0.240 nm, as measured by positron annihilation lifetime spectroscopy. A method for heat-treating silica glass is also provided, which comprises holding silica glass to be heat-treated in an atmosphere at a temperature of at least 1,200° C. and at most 2,000° C. under a pressure of at least 30 MPa, and cooling the silica glass at an average temperature-decreasing rate of at least 40° C./min during cooling within a temperature range of from 1,200° C. to 900° C. A method for heat-treating silica glass also comprises holding silica glass to be heat-treated in an atmosphere at a temperature of at least 1,200° C. and at most 2,000° C. under a pressure of at least 140 MPa, and cooling the silica glass in an atmosphere under a pressure of at least 140 MPa during cooling within a temperature range of from 1,200° C. to 900° C.
    Type: Grant
    Filed: February 3, 2016
    Date of Patent: August 6, 2019
    Assignee: AGC Inc.
    Inventors: Madoka Ono, Setsuro Ito, Osamu Honma, Yousuke Amino
  • Publication number: 20190172605
    Abstract: Disclosed herein is an amorphous C12A7 electride thin film which has an electron density of greater than or equal to 2.0×1018 cm?3 and less than or equal to 2.3×1021 cm?3, and exhibits a light absorption at a photon energy position of 4.6 eV. Also disclosed herein is an amorphous thin film which is fabricated using a target made of a crystalline C12A7 electride, and containing an electride of an amorphous solid material includig calcium, aluminum, and oxygen, in which an Al/Ca molar ratio of the thin film is 0.5 to 4.7.
    Type: Application
    Filed: February 7, 2019
    Publication date: June 6, 2019
    Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCY
    Inventors: Hideo HOSONO, Yoshitake TODA, Katsuro HAYASHI, Setsuro ITO, Satoru WATANABE, Naomichi MIYAKAWA, Toshinari WATANABE, Kazuhiro ITO
  • Patent number: 10249402
    Abstract: A C12A7 electride thin film fabrication method includes a step of forming an amorphous C12A7 electride thin film on a substrate by vapor deposition under an atmosphere with an oxygen partial pressure of less than 0.1 Pa using a target made of a crystalline C12A7 electride having an electron density within a range of 2.0×1018 cm?3 to 2.3×1021 cm?3.
    Type: Grant
    Filed: December 11, 2014
    Date of Patent: April 2, 2019
    Assignees: TOKYO INSTITUTE OF TECHNOLOGY, AGC Inc., JAPAN SCIENCE AND TECHNOLOGY AGENCY
    Inventors: Hideo Hosono, Yoshitake Toda, Katsuro Hayashi, Setsuro Ito, Satoru Watanabe, Naomichi Miyakawa, Toshinari Watanabe, Kazuhiro Ito
  • Patent number: 9758424
    Abstract: The present invention relates to an anisotropic glass containing, in terms of mol % on the basis of oxides, P2O5 in a content of from 45 mol % to 57 mol %, two or more kinds of alkali metal oxides selected from the group consisting of Li2O, Na2O, K2O, Rb2O, and Cs2O in a total content of from 30 mol % to 54 mol %, and at least one polyvalent element oxide other than P2O5 in a total content of from 0.1 mol % to 20 mol %, and having a birefringence of 30×10?6 or more.
    Type: Grant
    Filed: May 31, 2016
    Date of Patent: September 12, 2017
    Assignee: ASAHI GLASS COMPANY, LIMITED
    Inventors: Seiji Inaba, Setsuro Ito
  • Publication number: 20160362328
    Abstract: The present invention relates to an anisotropic glass containing, in terms of mol % on the basis of oxides, P2O5 in a content of from 45 mol % to 57 mol %, two or more kinds of alkali metal oxides selected from the group consisting of Li2O, Na2O, K2O, Rb2O, and Cs2O in a total content of from 30 mol % to 54 mol %, and at least one polyvalent element oxide other than P2O5 in a total content of from 0.1 mol % to 20 mol %, and having a birefringence of 30×10?6 or more.
    Type: Application
    Filed: May 31, 2016
    Publication date: December 15, 2016
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Seiji INABA, Setsuro ITO
  • Patent number: 9368739
    Abstract: A light emitting device including an organic electroluminescence element is provided. The light emitting device may be a display device or a lighting device. The organic electroluminescence element includes an anode, a light emitting layer, and a cathode that are arranged in this order. An electron injection layer is arranged between the light emitting layer and the cathode. The electron injection layer is made of an amorphous C12A7 electride.
    Type: Grant
    Filed: December 11, 2014
    Date of Patent: June 14, 2016
    Assignees: TOKYO INSTITUTE OF TECHNOLOGY, Asahi Glass Company, Limited
    Inventors: Hideo Hosono, Yoshitake Toda, Setsuro Ito, Satoru Watanabe, Naomichi Miyakawa, Kazuhiro Ito, Toshinari Watanabe
  • Publication number: 20160152504
    Abstract: To provide low scattering silica glass suitable as a material of an optical communication fiber. Silica glass, which has a fictive temperature of at least 1,000° C., and which has a void radius of at most 0.240 nm as measured by positron annihilation lifetime spectroscopy. A method for heat-treating silica glass, which comprises holding silica glass to be heat-treated in an atmosphere at a temperature of at least 1,200° C. and at most 2,000° C. under a pressure of at least 30 MPa, and cooling the silica glass at an average temperature-decreasing rate of at least 40° C./min during cooling within a temperature range of from 1,200° C. to 900° C. A method for heat-treating silica glass, which comprises holding silica glass to be heat-treated in an atmosphere at a temperature of at least 1,200° C. and at most 2,000° C. under a pressure of at least 140 MPa, and cooling the silica glass in an atmosphere under a pressure of at least 140 MPa during cooling within a temperature range of from 1,200° C. to 900° C.
    Type: Application
    Filed: February 3, 2016
    Publication date: June 2, 2016
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Madoka ONO, Setsuro ITO, Osamu HONMA, Yousuke AMINO
  • Publication number: 20150137103
    Abstract: A light emitting device including an organic electroluminescence element is provided. The light emitting device may be a display device or a lighting device. The organic electroluminescence element includes an anode, a light emitting layer, and a cathode that are arranged in this order. An electron injection layer is arranged between the light emitting layer and the cathode. The electron injection layer is made of an amorphous C12A7 electride.
    Type: Application
    Filed: December 11, 2014
    Publication date: May 21, 2015
    Applicants: TOKYO INSTITUTE OF TECHNOLOGY, ASAHI GLASS COMPANY, LIMITED
    Inventors: Hideo Hosono, Yoshitake TODA, Setsuro ITO, Satoru WATANABE, Naomichi MIYAKAWA, Kazuhiro ITO, Toshinari WATANABE
  • Publication number: 20150093583
    Abstract: A C12A7 electride thin film fabrication method includes a step of forming an amorphous C12A7 electride thin film on a substrate by vapor deposition under an atmosphere with an oxygen partial pressure of less than 0.1 Pa using a target made of a crystalline C12A7 electride having an electron density within a range of 2.0×1018 cm?3 to 2.3×1021 cm?3.
    Type: Application
    Filed: December 11, 2014
    Publication date: April 2, 2015
    Applicants: TOKYO INSTITUTE OF TECHNOLOGY, ASAHI GLASS COMPANY, LIMITED
    Inventors: Hideo HOSONO, Yoshitake TODA, Katsuro HAYASHI, Setsuro ITO, Satoru WATANABE, Naomichi MIYAKAWA, Toshinari WATANABE, Kazuhiro ITO
  • Publication number: 20140242391
    Abstract: To provide a glass plate to be tempered, which has a low thermal expansion coefficient at relatively low temperature, and which can have a sufficiently high surface compression stress by a conventional heat tempering process, even when it is thin. A glass plate to be tempered, which contains B2O3 in a range of from 12.5 to 35 mol % in its composition, the difference [X?Y] between the total content X of compounds selected from MgO, CaO, BaO, Na2O and K2O in the composition and the content Y of B2O3 in the composition being within a range of from ?5 to 10 mol %, and which is to be tempered by heating and quenching.
    Type: Application
    Filed: September 20, 2012
    Publication date: August 28, 2014
    Applicant: Asahi Glass Company, Limited
    Inventors: Madoka Ono, Akio Koike, Shinichi Amma, Setsuro Ito
  • Publication number: 20140005026
    Abstract: The present invention provides a glass plate to be tempered, which has a low thermal expansion coefficient, a high surface compression stress due to physical reinforcements and a low density and is excellent in the scratch durability. A glass plate to be tempered which comprises, by mass % as represented by the following composition: SiO2: 55 to 85%, B2O3: 2 to 12%, MgO: 0.1 to 12%, CaO: 0.1 to 12%, Na2O: 0 to 13%, MgO+CaO+SrO+ZnO: 3 to 16% and Al2O3: 0 to 3% and, which can be tempered by heating and quenching.
    Type: Application
    Filed: August 28, 2013
    Publication date: January 2, 2014
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Akio KOIKE, Setsuro Ito
  • Patent number: 8454930
    Abstract: The present invention relates to a mayenite-type compound in which a part of Ca of a mayenite-type compound containing Ca, Al and oxygen is substituted by at least one kind of an atom M selected from the group consisting of Be, Mg and Sr, in which the mayenite-type compound has an atom number ratio represented by M/(Ca+M) of from 0.01 to 0.50, and at least a part of free oxygen ions in a mayenite-type crystal structure are substituted by anions of an atom having electron affinity smaller than that of an oxygen atom.
    Type: Grant
    Filed: February 25, 2011
    Date of Patent: June 4, 2013
    Assignee: Asahi Glass Company, Limited
    Inventors: Kazuhiro Ito, Satoru Watanabe, Naomichi Miyakawa, Setsuro Ito
  • Patent number: 8377413
    Abstract: To provide a method for preparing a mayenite-containing oxide containing a mayenite type compound and having a hydride ion density of at least 1×1018/cm3 without need for expensive facilities, control of complicated reaction conditions or a long period of reaction time. A method for preparing a mayenite-containing oxide, which comprises a firing step of heating a starting material having a molar ratio of CaO:Al2O3 being from 9:10 to 14:5 based on the oxides at a temperature of from 900 to 1,300° C. to obtain a fired powder and a hydrogenation step of firing the fired powder at a temperature of at least 1,210° C. and lower than 1,350° C.
    Type: Grant
    Filed: July 28, 2011
    Date of Patent: February 19, 2013
    Assignee: Asahi Glass Company, Limited
    Inventors: Kazuhiro Ito, Satoru Watanabe, Naomichi Miyakawa, Setsuro Ito, Kazunari Watanabe
  • Patent number: 8304974
    Abstract: The present invention relates to a fluorescent lamp including: a discharge space containing a discharge gas and being surrounded by a glass; a discharge electrode; a phosphor; and a mayenite type compound provided on at least a part of an inner surface contacting the discharge gas. According to the fluorescent lamp of the present invention, a fluorescent lamp that has good luminous efficiency of ultraviolet ray from a discharge gas, has good discharge characteristics such as discharge starting voltage and discharge sustaining voltage in a fluorescent lamp, is chemically stable, has excellent oxidation resistance, has excellent sputtering resistance, and can achieve electric power saving is provided.
    Type: Grant
    Filed: November 30, 2010
    Date of Patent: November 6, 2012
    Assignee: Asahi Glass Company, Limited
    Inventors: Satoru Watanabe, Kazuhiro Itoh, Naomichi Miyakawa, Kazunari Watanabe, Setsuro Ito
  • Patent number: 8225627
    Abstract: It is an object of the present invention to provide a new method for reducing the diameter of a bubble existing in a glass plate. Specifically, the present invention provides a method for reducing the diameter of a bubble existing in a glass plate, which comprises irradiating the vicinity of the bubble existing in the glass plate with a light beam emitted from a light source, to raise the temperature of the glass in the vicinity of the bubble to at least the melting point of the glass to reduce the maximum diameter of the bubble.
    Type: Grant
    Filed: October 15, 2007
    Date of Patent: July 24, 2012
    Assignee: Asahi Glass Company, Limited
    Inventors: Yutaka Kuroiwa, Setsuro Ito, Motoichi Iga
  • Publication number: 20120169225
    Abstract: An electrode for a discharge lamp is provided with a mayenite compound in at least a part of the electrode that emits secondary electrons, and the mayenite compound is fired in a vacuum atmosphere with an oxygen partial pressure of 10?3 Pa or less, an inert gas atmosphere with an oxygen partial pressure of 10?3 Pa or less, or a reducing atmosphere with an oxygen partial pressure of 10?3 Pa or less.
    Type: Application
    Filed: February 27, 2012
    Publication date: July 5, 2012
    Applicant: Asahi Glass Company, Limited
    Inventors: Kazuhiro ITO, Satoru WATANABE, Naomichi MIYAKAWA, Yutaka KUROIWA, Setsuro ITO
  • Publication number: 20120153805
    Abstract: An electrode for a discharge lamp includes an electrode body configured to emit thermal electrons. The electrode body is formed by a sintered body of a conductive mayenite compound.
    Type: Application
    Filed: February 23, 2012
    Publication date: June 21, 2012
    Applicant: Asahi Glass Company, Limited
    Inventors: Satoru WATANABE, Naomichi MIYAKAWA, Yutaka KUROIWA, Kazuhiro ITO, Setsuro ITO, Kei MAEDA
  • Publication number: 20120153806
    Abstract: An electrode for a discharge lamp is provided with a mayenite compound in at least a part of the electrode that emits secondary electrons, and a surface of a surface layer of the mayenite compound is plasma treated.
    Type: Application
    Filed: February 24, 2012
    Publication date: June 21, 2012
    Applicant: Asahi Glass Company, Limited
    Inventors: Kazuhiro Ito, Satoru Watanabe, Naomichi Miyakawa, Yutaka Kuroiwa, Setsuro Ito
  • Publication number: 20120153807
    Abstract: An electrode for a fluorescent lamp includes a filament and an emitter provided on the filament. The emitter includes a mayenite compound.
    Type: Application
    Filed: February 24, 2012
    Publication date: June 21, 2012
    Applicant: Asahi Glass Company, Limited
    Inventors: Shigeo Mikoshiba, Satoru Watanabe, Kazuhiro Ito, Naomichi Miyakawa, Setsuro Ito, Kei Maeda, Yutaka Kuroiwa
  • Patent number: 8173085
    Abstract: The present invention relates to a method for producing an oxide containing a conductive mayenite type compound and having an electron concentration of 1×1018/cm3 or more, from a raw material which is a combination of a calcium compound and an aluminum compound or is a compound containing calcium and aluminum, each having a molar ratio of calcium oxide and aluminum oxide ranging from 9:10 to 14:5 in terms of the oxides, the method including the steps of: heating and holding the raw material at 900 to 1,300° C. to produce a calcined powder containing at least one oxide selected from the group consisting of a calcium aluminate, calcium oxide and aluminum oxide; and heating and holding the calcined powder at 1,200° C. to less than 1,415° C. under a reduction atmosphere in an inert gas atmosphere or a vacuum atmosphere each having an oxygen partial pressure of 1,000 Pa or less.
    Type: Grant
    Filed: April 6, 2011
    Date of Patent: May 8, 2012
    Assignee: Asahi Glass Company, Limited
    Inventors: Kazuhiro Ito, Satoru Watanabe, Kazunari Watanabe, Setsuro Ito