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:
Aug. 20, 2002
Filed:
Jul. 11, 2000
Gueorgui L. Grouev, Arlington Heights, IL (US);
Peter W. Shackle, Arlington Heights, IL (US);
Energy Savings, Inc., Schaumburg, IL (US);
Abstract
Gas discharge lamps having filaments at each end thereof are operated in groups according to the power applied to separate line inputs to the ballast. The filaments of the lamps in a first group are powered by a first inverter that provides lamp current to a second group. The filaments of the lamps in the second group are powered by a second inverter that provides lamp current to the first group of lamps. Thus, even if an inverter is turned off, the lamps powered by that inverter are in a pre-heated state for instant starting. Power is coupled to the filaments by a network that is relatively insensitive to changes in frequency.