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:
Apr. 27, 1982
Filed:
Jan. 02, 1980
Applicant:
Inventors:
Assignee:
Ibigawa Electric Industry Co., Ltd., Ohgaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B / ; C01B / ; C01B / ;
U.S. Cl.
CPC ...
423345 ; 422139 ; 423D / ; 423439 ; 423440 ;
Abstract
Metal carbide powders containing free carbon which have heretofore been difficult to refine can be refined excellently by charging the metal carbide powders in a fluidizing bed consisting of fluidized heat-resistant particles and having a temperature of a determined range to burn and remove the free carbon contained therein, and by subsequently discharging refined metal carbide powders and combustion gas from an upper part of the fluidizing bed for recovery of the refined metal carbide powders.