Patent · US Expired

Fluorescent lamp with silicon dioxide coating

US4344016A · kind A · utility

12Cited by

6References

8Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Roland Hoffmann · Augsburg, DE
Ernst Panofski · Augsburg, DE

Key dates

Filing date	Feb 25, 1980
Grant date	Aug 10, 1982
Priority date	—
Expiry date	Feb 25, 2000

Classification

Technology area (CPC H)Electricity
CPC primaryH01J61/35
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An improved low pressure mercury vapor discharge lamp, particularly of the fluorescent type. The inner wall of the glass envelope is coated with a layer of SiO.sub.2 particles which, in turn, is coated with a phosphor layer. The SiO.sub.2 particles have a particle size of below about 100 nm. The SiO.sub.2 particle containing layer containing between 0.5 and 0.7 mg of SiO.sub.2 particles per square centimeter of glass envelope which is coated.

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