Patent · US Expired

Discharge lamp

US6410169B1 · kind B1 · utility

2Cited by

3References

8Claims

0Family size

Assignee

KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

Thomas Justel · Witten, DE
Herbert Friedrich Borner · Hamburg, DE
Hans Nikol · Aachen, DE
Wolfgang Busselt · Roetgen, DE

Key dates

Filing date	Nov 17, 1999
Grant date	Jun 25, 2002
Priority date	—
Expiry date	Nov 17, 2019

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S428/917
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

In the luminescent screen of a flourescent lamp an organic europium compound is incorporated for converting mercury radiation between 350 nm and 450 nm into red light. The organic europium compound is diluted in an organic polymer. When the fluorescent lamp is dimmed its colour point shifts into the red similar to incandescent lamps and not into the blue.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.