Patents Assigned to NGk Opt Ceramics, Ltd.
  • Glass material and glass ceramic product
    Patent number: 6689704
    Abstract: A SiO2—Al2O3—Li2O component-based glass material, which comprises, as basic components, SiO2: 60-63 wt %; Al2O3: 23-25 wt %; and Li2O: 4-5 wt % and, as modifying components, ZrO2: 1.5-2.5 wt %; TiO2: 0.5-2.5 wt %; MgO: 0.5-1.5 wt %; ZnO: 0.5-1.2 wt %; Na2O: 0.5-2.0 wt %; and K2O: 0.5-2.0 wt %, and further comprises any one of BaO: 0.5-1.0 wt, CaO: 1.0-2.0 wt %, and B2O3: 0.01-1.0 wt %. This can be reheat-formed in a glass state and has a low thermal expansion coefficient.
    Type: Grant
    Filed: March 29, 2001
    Date of Patent: February 10, 2004
    Assignees: NGK Insulators, Ltd., NGk Opt Ceramics, Ltd.
    Inventors: Takashi Ota, Kazutoshi Tohyama, Masashi Fukuyama, Akiyoshi Ide