Patent · US Expired

Process for producing an electric lamp with outer bulb

US7112116B2 · kind B2 · utility

1Cited by

6References

9Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Jurgen Graf · Wels, AT
Andreas Hohlfeld · Berlin, DE
Michael Hulsemann · Delbrück, DE
Anton Schlögl · Meitingen, DE
Karen Twesten · Berlin, DE

Key dates

Filing date	Jun 2, 2004
Grant date	Sep 26, 2006
Priority date	—
Expiry date	Jan 8, 2025

Classification

Technology area (CPC H)Electricity
CPC primaryH01J61/368
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The process comprises the provision of a discharge vessel (2) which is closed off on one side, fitting a second tube over part of the discharge vessel and evacuating and filling the volume of the outer bulb via a pumping hole, which remains open in the second extension part within the second tube. This pumping hole is only closed at the end by means of an operation which closes it by rolling.

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