Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Reexamination Certificate
2005-09-27
2009-06-30
Group, Karl E (Department: 1793)
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
C313S636000
Reexamination Certificate
active
07553786
ABSTRACT:
The alumino-silicate glass for lamp bulbs with molybdenum components contains alkaline earth metals and has the following composition (in % by weight based on oxide): SiO2>58 to 62, Al2O315 to 17.5, MgO 0.1 to <1, CaO 5.5 to 14, SrO 0 to 8, BaO 6 to 17, ZrO20 to 1, CeO20 to 0.3, TiO20 to 5, MoO30 to 2, Bi2O30 to 4, with a sum total amount of alkaline earth oxides from 11.6 to 29. In addition, the alumino-silicate glass is free of B2O3so that it has a high thermal stability. Lamp bulbs made with this glass can withstand a bulb temperature of greater than 650° C.
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Fechner Joerg Hinrich
Ott Franz
Bolden Elizabeth A
Group Karl E
Schott AG
Striker Michael J.
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