Patent · US Expired

Electric incandescent lamp with infrared reflecting layer

US6424089B1 · kind B1 · utility

2Cited by

6References

9Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Ulrich Binder · Ennigerloh, DE
Sigbert Mueller · Gräfenberg, DE
Axel Bunk · Berlin, DE

Key dates

Filing date	May 22, 2000
Grant date	Jul 23, 2002
Priority date	—
Expiry date	May 22, 2020

Classification

Technology area (CPC H)Electricity
CPC primaryH01K1/325
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

Electrical incandescent lamp, in particular a halogen incandescent lamp (4) having a lamp bulb (5) which has a coating (9) that reflects IR radiation, and having a flat luminous body (10) which defines a fictional plane of the light and is arranged inside the lamp bulb (5). The shape of the lamp bulb (5) with respect to those axes which lie in the plane of the light have no rotational symmetry, but the lamp bulb (5) in fact has a shape which differs from rotational symmetry but is matched to the flat geometry of the luminous body (10), that is to say a flattened shape, in particular the shape of an ellipsoid, whose shortest half-axis is oriented at right-angles to the fictional plane of the light of the luminous body (10).

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