Patent · US Expired

Double-based, double-ended, pinch-sealed electric lamp with integral base

US5932955A · kind A · utility

79Cited by

7References

20Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Helmut Berger · Lindlar, DE
Juergen Eder · Cologne, DE
Hans Liermann · Kandern, DE

Key dates

Filing date	Nov 13, 1996
Grant date	Aug 3, 1999
Priority date	—
Expiry date	Nov 13, 2016

Classification

Technology area (CPC H)Electricity
CPC primaryH01K1/44
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

To eliminate the necessity of a separate base for a pinch-sealed lamp having a glass bulb, a sleeve (11) made of the same material as the bulb (1) of the lamp, is formed on an extension of the pinch seal (6), the sleeve retaining a contact element (13) secured in the sleeve, for example by molten glass. The contact element (13) extends essentially transverse to a longitudinal axis (A) of the lamp, is recessed within the interior of the sleeve (11) and preferably has a circumference, which is spaced from said axis (A) by circumferentially different distances, optionally in accordance with a mathematical function which, further optionally, is a periodic function, wherein the minimum spacing of the circumference of said contact element from the axis (A) is less than the inner radius of the sleeve (11).

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