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:
Sep. 07, 2004
Filed:
Oct. 25, 2001
Applicant:
Inventor:
Alfons Lechner, Hohenwart, DE;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B 3/900 ;
U.S. Cl.
CPC ...
H05B 3/900 ;
Abstract
In a lighting system which includes an electronic operating device and a gas discharge lamp with filaments, one filament terminal is respectively connected to an impedance network. The impedance network has an impedance function with a zero point at the frequency f For preheating purposes, the electronic operating device outputs a voltage whose frequency is close to the frequency f As a result, the voltage across the lamp is below the non-starting voltage during preheating.