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:
Jun. 11, 2002
Filed:
Jan. 28, 2000
Martijn H.R. Lankhorst, Eindhoven, NL;
Ulrich Niemann, Aachen, DE;
Lambert C.I. Kaldenhoven, Eindhoven, NL;
Wilhelmus C. Keur, Eindhoven, NL;
Marinus J.W.M. Van De Ven, Eindhoven, NL;
Abstract
A low-pressure mercury vapor discharge lamp is provided with a discharge vessel ( ) enclosing a discharge space ( ) containing a filling of mercury and a rare gas, an amalgam ( ) which communicates with the discharge space ( ), and means for maintaining an electric discharge in the discharge vessel ( ). The amalgam ( ) comprises a Bi:Sn content in the range of 80:20≦Bi:Sn≦20:80, a Pb content in the range of 0.7<Pb≦12 at % and a Hg content in the range of 0.05≦Hg≦2 at %. For compact fluorescent discharge lamps, the amalgam ( ) preferably comprises 70:30≦Bi:Sn≦30:70, 1≦Pb≦10 at % and 0.25≦Hg≦1.2 at %. For electrodeless low-pressure mercury vapor discharge lamps, the amalgam preferably comprises 70:30≦Bi:Sn≦30:70, 1≦Pb≦10 at % and 0.05≦Hg≦0.5 at %. The lamp has a comparatively high initial radiation output and a short run-up time in combination with a comparatively high radiation output during nominal lamp operation, which is achieved in a comparatively large temperature interval.