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. 16, 1981
Filed:
Jul. 24, 1979
Applicant:
Inventors:
Assignee:
Fried. Krupp Huttenwerke Aktiengesellschaft, Bochum, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F27D / ; F27D / ;
U.S. Cl.
CPC ...
13 35 ; 13 32 ;
Abstract
An arc furnace roof has a central portion formed by a circular group of individually suspended segments having sides which cooperatively form openings for the passage of arcing electrodes. Each segment is formed by a metal shell having cooling water inlets and outlets and internal baffles causing cooling water to be guided through the shell so that cooling is adequate to avoid the need for lining the bottoms of the segments with thick refractory linings, the bottoms being only coated with a thin layer of refractory electrical insulation. The electrode openings have refractory electrical insulation to isolate the segments from electrode currents.