Patents by Inventor Haruo Aizawa

Haruo Aizawa 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 CHEMICALLY STRENGTHENED GLASS SUBSTRATE FOR DISPLAY DEVICE
    Publication number: 20130338051
    Abstract: The present invention provides a method for producing a chemically strengthened glass for a display device, which is capable of suppressing generation of concave defects. The present invention relates to a method for producing a chemically strengthened glass substrate for a display device, in which a calcium concentration in a cleaning liquid used in a final cleaning step before a chemical strengthening step is 5 ppm or less.
    Type: Application
    Filed: June 3, 2013
    Publication date: December 19, 2013
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Shuji Matsumoto, Tsuguhide Isemura, Koji Nakagawa, Kazutaka Ono, Shusaku Akiba, Haruo Aizawa
  • PROCESS FOR PRODUCING CHEMICALLY STRENGTHENED GLASS SUBSTRATE FOR DISPLAY DEVICE
    Publication number: 20120240626
    Abstract: The present invention relates to a process for producing a chemically strengthened glass substrate for a display device, the process including a pre-heating step of pre-heating a glass to a pre-heating temperature and subsequently an ion exchange step of immersing the glass in a chemical strengthening liquid, in which the pre-heating temperature in the pre-heating step and a strain point of the glass satisfy: 220° C.?(strain point?pre-heating temperature).
    Type: Application
    Filed: March 23, 2012
    Publication date: September 27, 2012
    Applicant: Asahi Glass Company, Limited
    Inventors: Syuji MATSUMOTO, Tsuguhide Isemura, Koji Nakagawa, Kazutaka Ono, Shusaku Akiba, Haruo Aizawa
  • Glass composition and substrate for plasma display
    Patent number: 5780373
    Abstract: A glass composition comprising from 45 to 66 wt % of SiO.sub.2, from 0 to 15 wt % of Al.sub.2 O.sub.3, from 10 to 24 wt % of Li.sub.2 O+Na.sub.2 O+K.sub.2 O, from 14 to 26 wt % of CaO+MgO+SrO+BaO+ZnO, and from 0 to 1 wt % of SO.sub.3 +Sb.sub.2 O.sub.3, said glass composition containing substantially no zirconia and having a strain point of at least 560.degree. C. and a linear thermal expansion coefficient of at least 80.times.10.sup.-7 /.degree.C. within a temperature range of from 50.degree. to 350.degree. C.
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: July 14, 1998
    Assignee: Asahi Glass Company Ltd.
    Inventors: Osamu Yanagisawa, Kenji Oda, Naoki Sugimoto, Yoshio Takegawa, Akira Takada, Hideyo Osada, Haruo Aizawa, Koji Miura
  • Glass composition and substrate for plasma display
    Patent number: 5631195
    Abstract: A glass composition comprising from 45 to 66 wt % of SiO.sub.2, from 0 to 15 wt % of Al.sub.2 O.sub.3, from 10 to 24 wt % of Li.sub.2 O+Na.sub.2 O+K.sub.2 O, from 14 to 26 wt % of CaO+MgO+SrO+BaO+ZnO, and from 0 to 1 wt % of SO.sub.3 +Sb.sub.2 O.sub.3, said glass composition containing substantially no zirconia and having a strain point of at least 560.degree. C. and a linear thermal expansion coefficient of at least 80.times.10.sup.-7 /.degree.C. within a temperature range of from 50.degree. to 350.degree. C.
    Type: Grant
    Filed: September 14, 1995
    Date of Patent: May 20, 1997
    Assignee: Asahi Glass Company Ltd.
    Inventors: Osamu Yanagisawa, Kenji Oda, Naoki Sugimoto, Yoshio Takegawa, Akira Takada, Hideyo Osada, Haruo Aizawa, Koji Miura