Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium
Reexamination Certificate
2005-01-04
2005-01-04
Patel, Vip (Department: 2879)
Electric lamp and discharge devices
With luminescent solid or liquid material
With gaseous discharge medium
C313S493000, C313S631000, C313S634000, C313S635000
Reexamination Certificate
active
06838813
ABSTRACT:
The invention relates to a low-pressure discharge lamp, having a tubular discharge vessel made from glass, the free ends of which are closed off in a gas tight manner, two electrode systems (3) each having a filament (7), two supply conductors (5, 6) and a bead (8) of glass, the ends of the supply conductors (5, 6) being fused into the ends of the discharge vessel which have been closed off in a gas tight manner and, in order to be held in a region between the filament (7) and the discharge vessel fused seal (2), into the bead (8), and a device for switching off the lamp at the end of its service life, comprising a paste (9) which contains a metal hydride and is fitted to the bead (8). According to the invention, the bead (8) consists of a glass material which has a resistivity of greater 108Ωcm at 350° C. Moreover, the paste (9) containing the metal hydride is applied to the bead (8) in the radiation shadow with respect to the thermal radiation which emanates from the filament (7) of the lamp in operation, and is not in electrical contact with the supply conductor wires (5, 6) on the bead (8).
REFERENCES:
patent: 5585693 (1996-12-01), Shaffer
patent: 5705887 (1998-01-01), Shaffer
Blohm Bernhard
Fuchs Kirsten
Hämmer Gerald
Hilscher Achim
Husslein Peter
Bessone Carlo S.
Patel Vip
Patent-Treuhand-Gesellschaft für elektrische Glühlampe
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