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:
Dec. 14, 2004
Filed:
May. 07, 2002
Willem Van Erk, Eindhoven, NL;
Arnoldus Henricus Franciscus Maria Toonders, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
The high-pressure discharge lamp ( ) comprises a lamp vessel ( ) having a wall ( ) which is exposed to a wall load of at least 30 W/cm during operation of the lamp, and a discharge space ( ) in which a electrodes ( ) are disposed. The discharge space ( ) has a filling that comprises mercury, argon, and halides (not fluoride) of tin and indium, to which filling an alkali halide is added, the alkali being potassium, rubidium, or cesium, and the halide being chlorine, bromine, or iodine. The high-pressure discharge lamp ( ) according to the invention has an improved resistance to corrosion and to crystallization of the quartz glass wall ( ) because of shielding or spacer means ( ) by which a direct contact between electrode rods ( ) and the wall ( ) of the lamp vessel ( ) is counteracted.