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. 13, 2002
Filed:
Nov. 09, 1999
Robert Chandler, Lexington, MA (US);
Oleg Popov, Needham, MA (US);
Edward K. Shapiro, Lexington, MA (US);
Jakob Maya, Brookline, MA (US);
Other;
Abstract
An electrodeless compact fluorescent lamp operated at a frequency from 50 KHz to 1000 KHz and RF power from 10 W to 40 W is described. The lamp includes a bulbous glass envelope ( ) filled with rare gas and metal vapor, reentrant glass cavity ( ), an induction coil ( ) made from Litz wire, a ferrite assembly comprising a ferrite core ( ) and MnZn ferrite disk ( ), a cooling structure comprising a metal (or ceramic) tube ( ) positioned inside the ferrite core ( ) and a metal (or ceramic) unit ( ) that transmits the heat from the cavity and ferrite assembly to the Edison socket ( ), a thermal shield ( ), and a driver and matching network located inside the lamp base ( ). A protective coating ( ) and phosphor coating ( ) are coated on the inner surface of the envelope ( ) and reentrant cavity ( ). The reflective coating ( ) made from alumina is coated on the inner surface of the cavity ( ) and on the outer surface of the envelope bottom ( ). The mercury pressure is controlled in the envelope by the temperature of the amalgam ( ) positioned in the tubulation ( ) or by the temperature of pure mercury located in the cold spot.