Patent Number: 7,101,245

Title: Stable electrode design and method

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.

Inventors: Bell; Dean A. (Marcellus, NY), Russell; Timothy D. (North Ridgeville, OH)

Assignee: Welch Allyn, Inc.

International Classification: H01J 9/00 (20060101)

Expiration Date: 9/05/02018