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:
Apr. 25, 2006
Filed:
Oct. 31, 2003
Applicants:
Uwe Liess, München, DE;
Siegfried Mayer, Moosinning, DE;
Harald Schmitt, München, DE;
Inventors:
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 13/46 (2006.01);
U.S. Cl.
CPC ...
Abstract
A device for operating a plurality of discharge lamps is to be fashioned cost-effectively. Consequently, two discharge lamps () are operated with the aid of one ballast in whose load circuit the heating current for the individual incandescent filaments () is transmitted via a heating transformer with three secondary windings (L, L, L). The associated primary winding (L) is located in a coupling-out circuit () with the aid of which the required heating energy is coupled out via an inductor (L). The heating current can be controlled by a temperature-sensitive thermistor (PTC).