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. 22, 2000
Filed:
Sep. 23, 1999
Applicant:
Inventors:
Assignees:
Patent-Treuhand-Gesellschaft fuer elektrische Gluehlampen mbH, Munich, DE;
STMicroelectronics S.r.l., Agrate Brianza, IT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
315362 ; 315313 ;
Abstract
A circuit is described with which an operation circuit for a discharge lamp can be switched between operation states with different lamp currents by hort interruptions of the power supply. Long interruptions than a certain time threshold result in basic state operation.