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:
Jan. 03, 1989
Filed:
Dec. 22, 1987
Applicant:
Inventors:
James H Leckie, Huntington, IN (US);
Horace Pops, Fort Wayne, IN (US);
Assignee:
Essex Group, Inc., Ft. Wayne, IN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22B / ;
U.S. Cl.
CPC ...
75 76 ; 75 72 ; 75 96 ;
Abstract
Processes for providing an inert gas protective atmosphere during shut down periods of a copper melting shaft furnace are described. Upon shut down of the furnace, liquid nitrogen is introduced into the furnace interior and forms gaseous nitrogen upon vaporization. A two-stage process is employed with the initial introduction of liquid nitrogen at a high rate to flush out all oxygen bearing atmospheres from the furnace, followed by the introduction of liquid nitrogen at a lower rate sufficient to maintain the protective nitrogen atmosphere.