Electric incandescent lamp for series arrangement having an electrically conductive vitreous body connecting oxide coated current-supply conductors
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United States of America Patent
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-
Feb 28, 1989
Grant Date -
N/A
app pub date -
Jun 18, 1987
filing date -
Jun 18, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The electric lamp for series arrangement comprises at least one current-supply wire of nickel wire, copper wire or copper cladded wire. A shortcircuit switch is provided, which consists of a vitreous mass, in which copper powder is dispersed and which is fused with the current-supply wires, and of an oxide skin, which is present on the said current-supply wire at the sealing-in area in the mass. The vitreous mass is electrically conducting. An electrical connection between the current-supply wires is not obtained, however, until the filament burns through and the oxide skin breaks down due to the overvoltage then occurring.
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