Patents Assigned to Telux-Spezialglas GmbH
  • Alumino earth-alkali silicate glasses with high thermal capacity for light bulbs and use thereof
    Patent number: 7211957
    Abstract: An alumino earth-alkali silicate glass for lamp bulbs of tungsten halogen incandescent lamps has the following glass composition (% by weight) that reduces discoloration during operation of the lamp bulb: SiO2 55.0–62.5?? Al2O3 14.5–18.5?? B2O3 0.8–4.0?? BaO 7.5–17.0? CaO 6.5–13.5? MgO 1.0–5.5?? SrO 0–2.0 ZrO2 0–1.5 TiO2 0–1.0 ZnO 0–0.5 CeO2 0–0.3 R2O <0.03 H2O 0.025–0.042.
    Type: Grant
    Filed: December 29, 2004
    Date of Patent: May 1, 2007
    Assignee: Telux-Spezialglas GmbH
    Inventors: Hannelore Bergmann, Hans-Jurgen Bergmann