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:
Sep. 11, 1990
Filed:
Nov. 03, 1989
Applicant:
Inventors:
Assignee:
Mitsubishi Kinzoku Kabsuhiki Kaisha, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01F / ; C01F / ; C01G / ;
U.S. Cl.
CPC ...
505-1 ; 423593 ; 423263 ; 423265 ; 423337 ; 423604 ; 423636 ; 423639 ; 502252 ; 502355 ; 501 94 ; 501123 ; 501126 ; 501152 ; 505735 ; 505737 ; 505738 ; 505780 ; 252 51 ; 252521 ;
Abstract
A process for preparing compound metal oxides, superconductive compound oxides, is disclosed. The process comprises preparing an aqueous solution containing a predetermined content ratio of chloride, nitrate or acetate of a rare earth metal, an alkaline earth metal and copper, said content ration corresponding to the composition of the object compound metal oxide, adjusting the pH of the solution to 1.5-2.0, adding oxalic acid in an amount such that the concentration of the residual oxalic acid becomes 0.05 M/l-0.1 M/l, collecting the thus formed precipitate and firing it.