Lead-free amber-colored electric lamp
AssigneeKoninklijke Philips Electronics N.V.
InventorsHubertina Maria Petra Ulenaers, Cornelis Jacob Van De Velde, Simon Krijnen
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Abstract
The invention relates to electric lamps and more particularly to automotive signal lamps. Lead-free, cadmium-free, sulfate-refined glass compositions are described for use in electric lamps, which glass is amber colored and comprises no toxic or forbidden components which could be harmful to the environment such as lead oxide, antimony oxide, selenium or cadmium.
Claims7
An electric lamp having a glass envelope, the wall of the glass being amber colored, the glass composition of the wall comprising up to 1% by weight molybdenum in oxidic form and up to 2.5% by weight SO3.
An electric lamp having a glass envelope of glass, the wall of the glass being amber colored, the glass composition of the wall comprising molybdenum in oxidic form for up to 1% by weight and the glass being refined using sulfate as a refining agent in a reducing atmosphere so that the glass composition may contain up to 2.5% by weight of SO3.
Dependencies are inferred from the claim text.