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:
Aug. 01, 1995
Filed:
Sep. 02, 1994
Hsueh-Rong Chang, Schenectady, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
Silver metal and nickel silicide are added to the fill of an electrodeless high intensity metal halide discharge lamp, which includes at least one metal iodide as a fill ingredient, for controlling the iodine vapor level therein. The nickel silicide acts to getter oxygen which has been introduced into the arc tube during lamp processing, thereby avoiding oxidation of the metal iodide portion of the fill and a concomitant release of free iodine into the arc tube. The silver acts to getter free iodine available from the metal iodide(s) of the fill as metal diffuses into the quartz arc tube wall, forming silver iodide (AgI). The combination of silver and nickel silicide acts to control the iodine level below an arc instability threshold to promote and maintain arc stability. In addition, neither silver nor nickel silicide attack the quartz arc tube wall. Lamp performance and lamp life are thus substantially improved.