Unitized chemically etched tungsten electrode

Details Unitized chemically etched tungsten electrode Unitized chemically etched tungsten electrode

2007-05-15

2007-05-15

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Electrode and shield structures

With lead wire or connector

C313S631000

Reexamination Certificate

active

11498346

ABSTRACT:
A method of making a unitized tungsten electrode which exhibits superior mechanical and electrical properties which includes providing a length of cylindrical cut stock having a predetermined diameter and length. The stock is ground to form a rough unfinished electrode having an enlarged tip or nose portion at one end integrally connected to an elongated shank section. The unfinished electrode is treated by exposure to a chemical etchant for a time sufficient to form a finished electrode characterized by a smooth nose and shank surface and rounded undercut and ends. The invention includes the electrode formed by the described process.

REFERENCES:
patent: 3067357 (1962-12-01), Fridrich

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