Glass
AssigneeGeneral Electric Company
InventorsZoltan Suha, Zsuzsanna Varga
Life of this patent
Estimating the term…
Abstract
The invention is a glass for electric lamps comprising SiO.sub.2, A1.sub.2 O.sub.3, Na.sub.2 O, K.sub.2 O, Li.sub.2 O, BaO, MgO, CaO, ZnO, B.sub.2 O.sub.3, TiO.sub.2, SbO.sub.3, MnO.sub.2 and one or more of the following Fe.sub.2 O.sub.3, As.sub.2 O.sub.3 and CeO.sub.2, where ZnO is 3 to 7 weight %, B.sub.2 O.sub.3 is 3 to 8 weight %, TiO.sub.2 is 0 to 1.5 weight %, Al.sub.2 O.sub.3 is 0.3 to 2.5 weight %, BaO is 1 to 4.5 weight %, CaO is 2 to 4.5 weight %, MgO is 0.5 to 3.7 weight %, and the sum of ZnO and B.sub.2 O.sub.3 is equal to at least 8.6 weight % to provide stability of the glass.
Claims17
An electric lamp glass comprising, expressed in terms of weight percent:
- ______________________________________ SiO.sub.2 58-64.5 Al.sub.2 O.sub.3 0.3-2.5 Na.sub.2 O 6-8.5 K.sub.2 O 7.5-11 Li.sub.2 O 0.5-1.2 MnO.sub.2 0-0.3 ZnO 3-7.0 B.sub.2 O.sub.3 3-8.0 BaO 1-4.5 MgO 0.5-3.7 CaO 2-4.5 TiO.sub.2 0-1.5 Fe.sub.2 O.sub.3 0-.15 As.sub.2 O.sub.3 0-0.6 CeO.sub.2 0-0.8 ______________________________________
- and where ZnO+B.sub.2 O.sub.3 .gtoreq.8.6 to provide stability of the glass.
An electric lamp comprising SiO.sub.2 in 58 to 64.5 weight %, Al.sub.2 O.sub.3 in 0.3 to 2.5 weight %, Na.sub.2 O in 6 to 8.5 weight %, K.sub.2 O in 7.5 to 11 weight %, Li.sub.2 O in 0.5 to 1.2 weight %, BaO in 1 to 4.5 weight %, MgO in 0.5 to 3.7 weight %, CaO in 2 to 4.5 weight %, ZnO in 3 to 7 weight %, B.sub.2 O.sub.3 in 3 to 8 weight %, TiO.sub.2 in 0 to 1.5 weight %, Sb.sub.2 O.sub.3 in 0 to 0.6 weight %, As.sub.2 O.sub.3 in 0 to 0.6 weight %, CeO.sub.2 in 0 to 0.8 weight %, MnO.sub.2 in 0 to 0.3 weight %, Fe.sub.2 O.sub.3 in 0 to 0.15 weight %.
A stem for electric lamps across which stem current lead-ins pass and are sealed in said stem in a vacuum-tight manner, and said stem is sealed in the bulb of the lamp in a vacuum-tight manner and said stem includes a glass comprising, expressed in terms of weight percent:
- ______________________________________ SiO.sub.2 58-64.5 Al.sub.2 O.sub.3 0.3-2.5 Na.sub.2 O 6-8.5 K.sub.2 O 7.5-11 Li.sub.2 O 0.5-1.2 BaO 1-4.5 MgO 0.5-3.7 CaO 2-4.5 TiO.sub.2 0-1.5 Sb.sub.2 O.sub.3 0-0.6 MnO.sub.2 0-0.3 Fe.sub.2 O.sub.3 0-0.15 As.sub.2 O.sub.3 0-0.6 CeO.sub.2 0-0.8 ______________________________________
- and where ZnO+B.sub.2 O.sub.3 .gtoreq.8.6 to provide stability of the glass.
A bulb for electric lamps, expressed in terms of weight percent:
- ______________________________________ SiO.sub.2 58-64.5 Al.sub.2 O.sub.3 0.3-2.5 Na.sub.2 O 6-8.5 K.sub.2 O 7.5-11 Li.sub.2 O 0.5-1.2 BaO 1-4.5 MgO 0.5-3.7 CaO 2-4.5 TiO.sub.2 0-1.5 Sb.sub.2 O.sub.3 0-0.6 MnO.sub.2 0-0.3 Fe.sub.2 O.sub.3 0-0.15 As.sub.2 O.sub.3 0-0.6 CeO.sub.2 0-0.8 ______________________________________
- and where ZnO+B.sub.2 O.sub.3 24 8.6 to provide stability of the glass.
An exhaust tube for electric lamps including a glass comprising, expressed in terms of weight percent:
- ______________________________________ SiO.sub.2 58-64.5 Al.sub.2 O.sub.3 0.3-2.5 Na.sub.2 O 6-8.5 K.sub.2 O 7.5-11 Li.sub.2 O 0.5-1.2 BaO 1-4.5 MgO 0.5-3.7 CaO 2-4.5 TiO.sub.2 0-1.5 Sb.sub.2 O.sub.3 0-0.6 MnO.sub.2 0-0.3 Fe.sub.2 O.sub.3 0-0.15 As.sub.2 O.sub.3 0-0.6 CeO.sub.2 0-0.8 ______________________________________
- and where ZnO+B.sub.2 O.sub.3 .gtoreq.8.6 to provide stability of the glass .
Dependencies are inferred from the claim text.