US2153390A - Leading-in wire for electric devices - Google Patents

Description

' Pa tented Apr. 4, 1939 PATENT OFFICE LEADING-IN FOB ELECTRIC DEVICES Marcello Pirani, Berlin-Wilmersdorf, and Ham Wolfl', Zeuthen, Germany, 'aulgnors to General Electric Company, a corporation of New York No Drawing. Application December 14, 1983, Se-

gigsls No. 702,425. In Germany January 6. 3 Claims. (Cl. 49-92) a r.

Our invention relates to leading-in wires for fined to amounts under flve per cent of the total electric devices comprising a glass bulb or enalloy. I v closure and more particularly to a new composi- The following suitable compositions may be tion for leading-in wires sealed in a bulb of used for the new leading-in wire alloy:

5 boron-silicate glass which has a higher melting p t by point than the usual lead and calcium glasses. weight Our new leading-in wire is particularly adapt- (1) Tungsten g .able for electric discharge tubes comprising a Nickel 12 bulb oi boron-silicate glass containing less than Comm 4 1 50 per cent of silicic acid and more than 30 per nu cent of boric acid with a small amount of alkali. (2) Tungsten 74 The bulbs of such tubes attain a temperature Nickel -7...- 22 of several hundred degrees centlgrade during Cobalt 4 operation and contain a filling of a vapor of substances such as sodium, cadmium, magnesium or thallium. P

An object of our invention therefore is to provide a leading-in wire which will form a reliable seal with a hard glass such as boron-silicate 20 glass.

According to our invention the new leading-in wire consists of an alloy of tungsten and nickel to which-is preferably added a small amountof cobalt. The proportions are preferably 70-85 per cent of tungsten and 15-30 per cent of nickel. Preferably a small part of the nickel, up to 5 per cent of the total quantity of alloy, is replaced by cobalt. This alloy can be readily drawn into wire. The sealing in the glass is improved by the an addition of the cobalt while the drawing qualities are not noticeably impaired by it when'con- What we claim as new and desire to secure by Letters Patent ofthe United States is:

1. As a new article of manufacture, a leadingin wire consisting of an alloy oftungsten and nickel, said alloy having a coeillcient and expansion adapting it to be sealed to hard glass.

2. As a new article of manufacture, a leadingin wire consisting of an. alloy of seventy to eighty-five per cent of, tungsten and fifteen to thirty per cent of nickel.

'3. As a, new article of manufacture, a boron silicate glass article having seal ed therein a leading-in wire consisting of an alloy of tungsten and nickel.

MARCELLO PIRANI. HANS WOLFE.

CERTIFICATE OF CORRECTION. Patent No. 2,153,390. April 1;, 1959.

MARCELLO PIRANI, E'I" AL,

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Second column, line 18, claim 1, for "and" read of; and that the said Letters Patent should be read with this correction therein that the some may conform to the rec- 0rd of the case in "the Pater 1t Office,

Signed and sealedthis 25rd day of May, AB'D 1959 Henry Ve n Arsdele (Seal) Acting Commissioner of Petenteu