Patent · US Expired

Flat illumination device

US6679617B1 · kind B1 · utility

2Cited by

3References

11Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Udo Custodis · Munich, DE
Angela Eberhardt · Augsburg, DE
Michael Ilmer · Augsburg, DE
Michael Seibold · Schwäbisch Gmünd, DE

Key dates

Filing date	Aug 8, 2001
Grant date	Jan 20, 2004
Priority date	—
Expiry date	Dec 11, 2021

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF21Y2105/00
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A flat lighting device (1) has two mutually opposite, at least partially transparent view surfaces in such a way that light from a light source, for example daylight or ambient light, backlighting the lighting device can pass through the transparent part (4) of the view surfaces. Moreover, the lighting device has at least one integrated light source, the, or each, light source being arranged in such a way that during operation a corresponding luminous area (2) inside at least one of the two view surfaces is formed by the, or each, light source.

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