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:
Feb. 03, 2004
Filed:
Jan. 10, 2002
Robert A. Erhardt, Schaumburg, IL (US);
Oscar J. Deurloo, Arlington Heights, IL (US);
Jerzy Janczak, Eindhoven, NL;
Hendrik A. Van Esveld, Geldrop, NL;
Winston D. Couwenberg, Veldhoven, NL;
Ronald H. Van Der Voort, Helmond, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
An improved high frequency ballast is disclosed. The high frequency ballast establishes a lamp current for a gas discharge lamp during a starting operation of the gas discharge lamp wherein an operating ampere level of the lamp current facilitates a substantial achievement by the gas discharge lamp of a color specification associated with the gas discharge lamp. Thereafter, during a stable operation of the gas discharge lamp, the high frequency ballast applies a frequency modulation to an operating frequency of the lamp current and/or an amplitude modulation of the lamp current.