The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 21, 1989
Filed:
Jul. 24, 1987
Applicant:
Inventors:
Sara H Anderson, Westmont, IL (US);
Noel F Lutgen, Dowyers Grove, IL (US);
Assignee:
Liquid Air Corporation, Walnut Creek, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22B / ;
U.S. Cl.
CPC ...
75 96 ;
Abstract
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.