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:
Oct. 11, 1988
Filed:
Mar. 18, 1987
Applicant:
Inventors:
Rolf Kiesel, Aalen, DE;
Karl Blum, Sohnstetten, DE;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01K / ;
U.S. Cl.
CPC ...
313579 ; 252372 ;
Abstract
To prevent carburation of a tungsten filament, the fill within the bulb is ormed by an inert gas, for example xenon or krypton, and an additive which is formed by a single halogenated hydrocarbon in which iodine is bound, and further includes at least one atom of bromine or chlorine; suitable additives are: CH.sub.2 ClI, CHCl.sub.2 I, CHClI.sub.2, CHClBrI, CH.sub.2 BrI, present in from between about 1.times.10.sup.-8 to 5.times.10.sup.-6 mol per cm.sup.3 of the internal volume of the bulb; particularly preferred are chlor iodine methane (CH.sub.2 ClI), present in about 1-3.times.10.sup.-7 mol per cm.sup.3 of the internal volume of the bulb.