Patent · US Expired

Manufacture of halogen cycle incandescent lamps

US4178050A · kind A · utility

4Cited by

7References

8Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Rolf Kiesel · Aalen, DE
Gerhard Maier · Herbrechtingen, DE
Helmut Grahmann · Friedberg, DE

Key dates

Filing date	Jan 16, 1978
Grant date	Dec 11, 1979
Priority date	—
Expiry date	Jan 16, 1998

Classification

Technology area (CPC H)Electricity
CPC primaryH01K3/20
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

To permit the use of hard glass rather than silica or quartz glass, a bulb of hard glass is drawn from a length of hard glass tubing, the exhaust tube being molded on adjacent the rounded-off bulb. A mount assembly composed of filaments and two or more lead-in wires is pinch-sealed into the bulb such that pre-oxidized portions of the lead-in wires come to lie within the pinch seal. The pinch seal is rendered vacuum-tight and shaped in separate steps including repeated heating to fuse the wires to the glass and to shape the pinch seal. Subsequent to filling with inert gas, the lamp manufacture is terminated by tipping off the exhaust tube.

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