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. 30, 2003
Filed:
May. 29, 2001
Applicant:
Inventors:
John Griffin, Morton Grove, IL (US);
Romel Panlilio, St. Charles, IL (US);
Sreeraman Venkitasubrahmanian, Naperville, IL (US);
Assignee:
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05F 1/00 ;
U.S. Cl.
CPC ...
G05F 1/00 ;
Abstract
The present invention provides electronic switching for a bi-level fluorescent lamp fixture that allows power to be switched on and off to a group of lamps in a fixture when more or less illumination is needed in an area. The power can be switched without the need to power down the fixture when switching from high level with all lamps illuminated to a low level with only part of the lamps illuminated. The lamp current or frequency can be adjusted to save power when only part of the lamps are illuminated.