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:
Jun. 11, 1996
Filed:
Nov. 08, 1994
Norbert Uebber, Langenfeld, DE;
Mannesmann Aktiengesellschaft, Dusseldorf, DE;
Abstract
A direct current electric arc furnace for melting metal, which furnace includes a furnace vessel having a lower vessel part lined with a refractory material and a metal upper vessel part through which a cooling agent can flow. A cover is adapted and arranged to close the furnace vessel. Electric current is fed to the furnace, by an arrangement including a main electrode extending into the furnace vessel through the cover, a bottom electrode located at the bottom of the lower vessel part, and feed lines that connect the electrodes to a direct current source. The feed lines include at least two current feeds connected to the bottom electrode, each current feed having a line segment parallel to a main axis of the main electrode and a shield for at least partially magnetically shielding the upper vessel part at an arc level from magnetic fields generated by the line segments parallel to the main axis. A drive moves the shield parallel to the line segment in order to weaken a magnetic field produced by the current at the arc level.