C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
C03C 4/08 (2006.01) C03C 3/06 (2006.01) C03C 3/095 (2006.01) H01J 61/30 (2006.01) H01J 61/40 (2006.01)
Patent
CA 2172558
An electric arc discharge lamp having an arc discharge light source which emits both visible light radiation and UV radiation enclosed within an anti-solarization borosilicate glass envelope which is lead and arsenic free and having a transmission of greater than 90% at a wave length of 425 nm and a transmission of not more than 40% of said UV radiation at 320 nm; 8% of said UV radiation at 300 nm; and 0.5% of said UV radiation at 290 nm, said borosilicate glass comprising, in weight percent: from about 3 89% Na2O; about 1.5% K2O; about 0.15% Li2O, about 17 % B2O3; about 1.4% A12O3; about 0.6% CaO; about 0.35% MgO; about 0.15%CeO2; from about 0.075% to about 0.30% SnO2; and the balance SiO2. Also, a glass having the above composition.
Biddulph R. Bruce
Marlor Richard C.
Osram Sylvania Inc.
R. William Wray & Associates
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