Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Patent
1997-07-24
1999-03-16
Bonner, Melissa
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
501 67, 501 69, 501 70, 501 72, 313480, 313636, C03C 389
Patent
active
058830308
ABSTRACT:
The invention relates to a glass composition for electric lamps comprising SiO.sub.2, Al.sub.2 O.sub.3, Na.sub.2 O, K.sub.2 O, Li.sub.2 O, B.sub.2 O.sub.3, BaO, CaO and MgO, in addition optionally SrO, Sb.sub.2 O.sub.3, MnO.sub.2, Fe.sub.2 O.sub.3, and/or CeO.sub.2. The glass composition according to the invention is characterized in that its B.sub.2 O.sub.3 content is 1 to 5 mass %, K.sub.2 O content is 7.2 to 11 mass %, BaO content is 5.5 to 9 mass % and MgO content is 2.1 to 4 mass %, furthermore in addition to the components listed, it optionally also comprises maximum 3.5 mass % ZnO, maximum 1.2 mass % TiO.sub.2 and maximum 0.8 mass % P.sub.2 O.sub.5 with the condition that the total amount of CaO, MgO and ZnO in the composition is at least 5.8 mass %. Stems and bulbs made of the above glass composition and used in electric lamps are also subject matters of the invention.
REFERENCES:
patent: 5391523 (1995-02-01), Marlor
Database WPI, Section Ch, Week 7432, Derwent Publications Ltd., London, GB; Class L02, AN 74-57500V, XP002046648 & JP 49 006 012 A (Tokyo Shibaura Electric Co), 19 Jan. 1974 *abstract*.
Chemical Abstracts, vol. 123, No. 16, 16 Oct. 1995, Columbus,Ohio, US; abstract No. 206791, Halfar, Jaroslav: "Lead-free crystal glass", XP002046647, *abstract* & CZ 278 012 A (Ornela, A. S., Czech Rep.).
Bako Zoltan Laszlo
Suha Zoltan Kamill
Varga Zsuzsanna Klara
Bonner Melissa
General Electric Company
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