Patents by Inventor Hideki Kushitani

Hideki Kushitani 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).

  • Method for producing alkali-free glass
    Patent number: 8272235
    Abstract: To provide a method whereby it is possible to produce an alkali-free glass having little bubbles therein and excellent in homogeneity and flatness. A method for producing an alkali-free glass, which comprises melting a glass raw material containing a silicon source, followed by forming, wherein as the silicon source, a silica sand is used which has a median particle diameter D50 of from 20 ?m to 80 ?m and which contains particles having a particle diameter of at most 2 ?m at a ratio of at most 0.3 vol % and particles having a particle diameter of at least 100 ?m at a ratio of at most 2.5 vol %.
    Type: Grant
    Filed: January 12, 2010
    Date of Patent: September 25, 2012
    Assignee: Asahi Glass Company, Limited
    Inventors: Mineko Yamamoto, Yasuo Hayashi, Hideki Kushitani, Tomoyuki Tsujimura
  • METHOD FOR PRODUCING ALKALI-FREE GLASS
    Publication number: 20100107697
    Abstract: To provide a method whereby it is possible to produce an alkali-free glass having little bubbles therein and excellent in homogeneity and flatness. A method for producing an alkali-free glass, which comprises melting a glass raw material containing a silicon source, followed by forming, wherein as the silicon source, a silica sand is used which has a median particle diameter D50 of from 20 ?m to 80 ?m and which contains particles having a particle diameter of at most 2 ?m at a ratio of at most 0.3 vol % and particles having a particle diameter of at least 100 ?m at a ratio of at most 2.5 vol %.
    Type: Application
    Filed: January 12, 2010
    Publication date: May 6, 2010
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Mineko Yamamoto, Yasuo Hayashi, Hideki Kushitani, Tomoyuki Tsujimura
  • Glass composition for a substrate, and substrate for plasma display made thereof
    Patent number: 5599754
    Abstract: A glass composition for a substrate consisting essentially of from 52 to 62 wt % of SiO.sub.2, from 5 to 12 wt % of Al.sub.2 O.sub.3, from 0 to 4 wt % of MgO, from 3 to 5.5 wt % of CaO, from 6 to 9 wt % of SrO, from 0 to 13 wt % of BaO, from 17 to 27 wt % of MgO+CaO+SrO+BaO, from 7 to 14 wt % of Li.sub.2 O+Na.sub.2 O+K.sub.2 O, from 0.2 to 6 wt % of ZrO.sub.2, and from 0 to 0.6 wt % of SO.sub.3.
    Type: Grant
    Filed: October 12, 1995
    Date of Patent: February 4, 1997
    Assignee: Asahi Glass Company Ltd.
    Inventors: Kei Maeda, Yasumasa Nakao, Hideki Kushitani, Setsuro Ito
  • Alkali free glass
    Patent number: 5348916
    Abstract: An alkali free glass consisting essentially of from 50 to 60 wt % of SiO.sub.2, from 8 to 16 wt % of Al.sub.2 O.sub.3, from 4 to 10 wt % of B.sub.2 O.sub.3, from 1.5 to 5 wt % of MgO, from 0 to 7 wt % of CaO, from 0 to 10 wt % of SrO, from 10 to 20 wt % of BaO and from 0 to 3 wt % of ZnO and essentially free from alkali metal oxides.
    Type: Grant
    Filed: November 16, 1993
    Date of Patent: September 20, 1994
    Assignee: Asahi Glass Company Ltd.
    Inventors: Hideki Kushitani, Manabu Nishizawa, Yasumasa Nakao
  • Alkali free glass
    Patent number: 5244847
    Abstract: An alkali free glass having a strain point of at least 650.degree. C. and consisting essentially of from 55 to 65 wt % of SiO.sub.2, from 10 to 18 wt % of Al.sub.2 O.sub.3, from 0 to 3 wt % of B.sub.2 O.sub.3, from 0 to 3 wt % of MgO, from 8 to 15 wt % of CaO, from 8 to 15 wt % of SrO and from 0 to 3 wt % of ZnO and essentially free from alkali metal oxides and BaO.
    Type: Grant
    Filed: April 24, 1992
    Date of Patent: September 14, 1993
    Assignee: Asahi Glass Company Ltd.
    Inventors: Hideki Kushitani, Manabu Nishizawa, Yasumasa Nakao