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:
Jul. 08, 2003
Filed:
Dec. 02, 1999
Elisabeth Onnekes-Van Der Voort, Turnhout, BE;
Hendrik Dreuning, Eindhoven, NL;
Franciscus H. Van Lierop, Shanghai, CN;
Peter A. Seinen, Eindhoven, NL;
Martin F. C. Willemsen, Hong Mei Lu, CN;
Mark Bolech, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
The electric lamp has a ceramic lamp vessel ( ) having a filling of rare gas and metal halide. Current conductors ( ) which support electrodes ( ) inside the discharge vessel ( ) enter the discharge vessel ( ) in a gastight manner through a ceramic sealing compound ( ). At least one of the current conductors ( ) has inside the lamp vessel ( ) a first, halogen-resistant part ( ) which is selected from tungsten silicide, molybdenum aluminide, molybdenum boride, pentamolybdenum trisilicide and combinations of at least two of these intermetallic compounds. These compounds have a coefficient of thermal expansion which corresponds to that of the discharge vessel ( ). It is thereby prevented that the discharge vessel starts leaking if the ceramic sealing compound ( ) extends beyond the first part ( ). As a result of their coefficient of thermal expansion, the intermetallic compounds may constitute the second part ( ) of the current conductors ( ) as well, which part ( ) is surrounded by the ceramic sealing compound ( ) in a gastight manner.