The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 04, 2005
Filed:
Apr. 25, 2003
Bernhard Blohm, Königsbrunn, DE;
Kirsten Fuchs, Mering, DE;
Achim Hilscher, Friedberg-Stätzling, DE;
Peter Husslein, Günzburg, DE;
Gerald Hämmer, Königsbrunn, DE;
Andreas Maciejewski, Maltingen, DE;
Thomas Noll, Kipfenberg, DE;
Klaus Pankratz, Zusmarshausen, DE;
Klaus Weingärtner, Augsburg, DE;
Bernhard Blohm, Königsbrunn, DE;
Kirsten Fuchs, Mering, DE;
Achim Hilscher, Friedberg-Stätzling, DE;
Peter Husslein, Günzburg, DE;
Gerald Hämmer, Königsbrunn, DE;
Andreas Maciejewski, Maltingen, DE;
Thomas Noll, Kipfenberg, DE;
Klaus Pankratz, Zusmarshausen, DE;
Klaus Weingärtner, Augsburg, DE;
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 () each having a filament (), two supply conductors () and a bead () of glass, the ends of the supply conductors () 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 () and the discharge vessel fused seal (), into the bead (), and a device for switching off the lamp at the end of its service life, comprising a paste () which contains a metal hydride and is fitted to the bead (). According to the invention, the bead () consists of a glass material which has a resistivity of greater 10Ωcm at 350° C. Moreover, the paste () containing the metal hydride is applied to the bead () in the radiation shadow with respect to the thermal radiation which emanates from the filament () of the lamp in operation, and is not in electrical contact with the supply conductor wires () on the bead ().