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:
Mar. 27, 1979
Filed:
Mar. 28, 1977
Applicant:
Inventor:
Bjorn Widell, Vesteras, SE;
Assignee:
ASEA Aktiebolag, Vesteras, SE;
Primary Examiner:
Int. Cl.
CPC ...
C21C / ; H05B / ;
U.S. Cl.
CPC ...
75 11 ; 13 / ;
Abstract
A DC arc furnace has a cathodic tubular graphite electrode forming an arc with an anodic carbonaceous iron melt in the furnace. A mixture of iron oxide and carbon particles is fed to the melt via the electrode's interior with the mixture's carbon content being in excess of that stoichiometrically required to reduce the iron oxide content of the mixture, the upper end of the electrode's feeding passage being blocked so that furnace gases cannot flow upwardly and impede the mixture's downward feeding flow.