# US 7,408,295 B2 · Mercury amalgams for elevated temperatures in discharge lamps

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- Number: US 7,408,295 B2
- Document ID: US7408295B2
- Status: Granted
- Kind: B2
- Application number: 11/102,820
- Filed: 2005-04-11
- Published: 2005-10-20
- Granted: 2008-08-05
- Earliest claimed: 2004-04-14
- Assignees: Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH
- Inventors: Martin Beck; Sylvia Frenzel; Roland Hoffmann
- Web page: https://patentgrep.com/patent/US7408295B2

## CPC

- C22C 28/00: Alloys based on a metal not provided for in groups C22C5/00 - C22C27/00
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

The present invention relates to mercury amalgams in discharge lamps for use at elevated operating temperatures.

## Claims

### Claim 1

A mercury amalgam for discharge lamps having a mercury fraction and a master alloy,
in which the master alloy corresponds to the general formula
Ina-eXbYcZdRe
where:
X is at least one element selected from the group consisting of Ag, Cu, Sn,
Y is at least one element selected from the group consisting of Pb, Zn,
Z is at least one element selected from the group consisting of Ni, Te,
R comprises additions of Bi, Sb, Ga and standard residues,
and where the following apply for a, b, c, d, e:
70%≦a≦98%;
b≦25%;
c≦25%;
d≦20%;
e≦15%.

### Claim 2 (depends on 1)

The amalgam as claimed in claim 1, in which X is Ag.

### Claim 3 (depends on 1)

The amalgam as claimed in claim 1, in which Y is Pb.

### Claim 4 (depends on 1)

The amalgam as claimed in claim 1, in which a is ≧75%.

### Claim 5 (depends on 1)

The amalgam as claimed in claim 1, in which a is ≦97.5%.

### Claim 6 (depends on 1)

The amalgam as claimed in claim 1, in which b is ≧2%.

### Claim 7 (depends on 1)

The amalgam as claimed in claim 1, in which b is ≦20%.

### Claim 8 (depends on 1)

The amalgam as claimed in claim 1, in which c is ≦20%.

### Claim 9 (depends on 1)

The amalgam as claimed in claim 1, in which the Hg content in the amalgam is ≧3%.

### Claim 10 (depends on 1)

A discharge lamp comprising the mercury amalgam as claimed in claim 1, which is designed in such a way that in normal operation the mercury amalgam reaches a temperature of 100° C.-170° C.

### Claim 11 (depends on 10)

The discharge lamp as claimed in claim 10, which is designed in such a way that in normal operation a mercury vapor pressure of at least 0.5 Pa.

### Claim 12 (depends on 2)

The amalgam as claimed in claim 2, in which Y is Pb.