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:
Dec. 23, 2003
Filed:
Oct. 15, 2002
Christofher Daniel Charles Hooijer, Eindhoven, NL;
Wilhelmus Hinderikus Maria Langeslag, Nijmegen, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A fluorescent lamp preheating circuit heats electrodes prior to lamp ignition while utilizing a sense resistor to detect and correct short-circuit conditions caused by improper wiring. The circuit uses few components, each of which is independent of parameters such as switching frequency, duty-cycle, and filament resistance, and is therefore compact, cost-effective, and efficient. The preheating circuit can be switched off when the electrodes are warmed sufficiently in order to conserve energy and prevent thermal overload, or when short-circuit conditions are encountered.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile