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. 28, 2004
Filed:
Aug. 06, 2002
Arnold Willem Buij, Eindhoven, NL;
Marcel Beij, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A ballast ( ) for feeding a fluorescent lamp ( ), comprising power supply means ( ) for supplying a stabilised power to the lamp ( ), dimming means ( ) for adjusting said power, a voltmeter ( ) which is capable of measuring the voltage across the lamp ( ), comparator means ( ) which are capable of comparing the measured voltage with a threshold value, contact breaker means ( ) which are capable of interrupting the power supply to the lamp ( ) when the measured voltage is higher than the threshold value for a predetermined period of time, as well as adjusting means ( ) which are capable of adjusting the magnitude of the threshold value in dependence on the power.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile