Liquid Air Corporation

Noel F Lutgen

Sara H Anderson

Liquid argon, nitrogen or carbon dioxide is poured onto the surface of a bath of molten metal in a furnace. According to the invention, liquefied gas is discharged onto the surface in an amount which ranges from about 0.025 to 0.060 lb/cu. in. of metal in the furnace, while a skirt is preferably set around the open end of said furnace. Oxygen concentration above the bath remains lower than about 3.0%, while hydrogen and nitrogen pick up are reduced.

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Dowyers Grove, IL, United States of America

Noel F Lutgen