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:
Jan. 04, 2011
Filed:
Oct. 12, 2006
Bernhard Schemmel, Wessling, DE;
Kay Schmidtmann, München, DE;
Bernhard Schemmel, Wessling, DE;
Kay Schmidtmann, München, DE;
OSRAM Gesellschaft mit beschraenkter Haftung, Munich, DE;
Abstract
The invention relates to an electronic ballast device for operating an electric lamp (), comprising a first () and a second lamp filament (), wherein the lamp filaments () are electrically connected to a heating circuit () during a pre-warming phase for the electric lamp () said heating circuit () being of such a form that the heating current generated by the heating circuit () during an operational phase of the electric lamp () amounts to between 20% and 60% of the lamp current of said electric lamp (). The invention further relates to a method for operation of an electric lamp with an electronic ballast device.