Patent ID: 7211957

Claim:
An alumino earth-alkali silicate glass for lamp bulbs of tungsten halogen incandescent lamps having the following glass composition (% by weight): SiO 2 55.0–62.5 Al 2 O 3 14.5–18.5 B 2 O 3 0.8–4.0 BaO 7.5–17.0 CaO 6.5–13.5 MgO 1.0–5.5 SrO 0–2.0 ZrO 2 0–1.5 TiO 2 0–1.0 ZnO 0–0.5 CeO 2 0–0.3 R 2 O <0.03 H 2 O 0.025–0.042.