Patent · US Expired

Lamp with low-toxicity, molybdenum-compatible sealing glass

US4766346A · kind A · utility

11Cited by

8References

13Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Werner Weiss · Stadtbergen, DE
Ewald Pösl · Kissing, DE

Key dates

Filing date	Apr 27, 1987
Grant date	Aug 23, 1988
Priority date	—
Expiry date	Apr 27, 2007

Classification

Technology area (CPC H)Electricity
CPC primaryH01K1/38
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

To provide a melt glass (10) to seal capillary spaces (9) surrounding external current supply leads (8) of molybdenum passing to molybdenum foils (6) in a pinch or press seal (7) of a high temperature, for example incandescent halogen lamp, the melt glass (10) is made of 3-10% Bi.sub.2 O.sub.3, 25%-40% B.sub.2 O.sub.3, remainder PbO. The melt glass has low toxicity and is molybdenum-compatible. An additive of barium oxide, in up to 15% and preferably up to only about 10%, may be added to the PbO. All quantities in mol-percent.

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