Electric incandescent lamp with a quartz glass lamp vessel and quartz glass tube for said lamp
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United States of America Patent
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Jun 4, 1996
Grant Date -
N/A
app pub date -
Sep 7, 1994
filing date -
Sep 1, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The electric incandescent lamp has a quartz glass lamp vessel (1) or envelope (4') around the lamp vessel, which has a red coloured dope in the area at the side of the incandescent body (3). The quartz glass with red dope contains samarium.sup.II oxide, aluminium oxide and silicon dioxide, the analysis of the glass in its oxidised form being Sm.sub.2 O.sub.3 to 1 to 3% by weight, Al.sub.2 O.sub.3 up to 3% by weight, rest SiO.sub.2, the molar ratio Al/Sm being at least 2.
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