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:
May. 08, 2012
Filed:
Jun. 07, 2007
Applicants:
Marcel Johannes Maria Bucks, Eindhoven, NL;
Engbert Bernard Gerard Nijhof, Eindhoven, NL;
Jozef Petrus Emanuel DE Krijger, Eindhoven, NL;
Jozef Alma Lodewijk Maria Ghijselen, Ghent, BE;
Inventors:
Marcel Johannes Maria Bucks, Eindhoven, NL;
Engbert Bernard Gerard Nijhof, Eindhoven, NL;
Jozef Petrus Emanuel De Krijger, Eindhoven, NL;
Jozef Alma Lodewijk Maria Ghijselen, Ghent, BE;
Assignee:
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05F 1/00 (2006.01); H05B 37/02 (2006.01); H05B 39/04 (2006.01); H05B 41/36 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method for detecting defective operation of a discharge lamp includes determining the lamp impedance and establishing that the lamp is operating in an incandescent mode if it is found that the lamp has a positive impedance.