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. 20, 2007
Filed:
Jun. 18, 2004
Valery A. Godyak, Brookline, MA (US);
Benjamin M. Alexandrovich, Brookline, MA (US);
Alexander A. Sapozhnikov, Framingham, MA (US);
Valery A. Godyak, Brookline, MA (US);
Benjamin M. Alexandrovich, Brookline, MA (US);
Alexander A. Sapozhnikov, Framingham, MA (US);
Osram Sylvania Inc., Danvers, MA (US);
Abstract
An electrodeless fluorescent lamphas an envelopethat includes a chamber. A coreof magnetic material, preferably ferrite, is positioned in the chamberand has a first windingsurrounding the core and having first and second lead-in wires, attached to a high frequency voltage supply or ballast. A second windingsurrounds the core, respective turns of the second windingbeing located adjacent turns of the first windingand electrically insulated therefrom. The second windinghas a free endand has another endconnected to one of the lead-in wires, for example. A braided sheathsurrounds the other of the lead-in wires. The first windingis generally called the RF antenna. The braided sheathis connected to the local ground. This inexpensive solution alone reduces the conductive EMI level sufficiently to pass all existing regulations on such interference with significant reserve.