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:
May. 24, 1994
Filed:
Mar. 09, 1993
Applicant:
Inventors:
Hans A Friedrichs, Solingen, DE;
Leonid W Ronkow, Herzogenrath, DE;
Assignee:
Osaka Fuji Corporation, Hyogoken, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F27B / ;
U.S. Cl.
CPC ...
266173 ; 75474 ; 75478 ; 75482 ;
Abstract
Metal-containing ores are extracted by a process and apparatus which avoid contaminating the product with fuel gas components. In a rotary kiln, a heat shock-resistant ceramic pipe is subjected to indirect high temperature heating, thereby allowing the extraction reaction to be conducted without heat producing fuel gases.