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:
Dec. 25, 1990
Filed:
May. 25, 1988
Applicant:
Inventors:
Etsuji Kimura, Kasukabe, JP;
Hisao Nakanishi, Nagaokakyo, JP;
Assignees:
Mitsubishi Kinzoku Kabushiki Kaisha, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01F / ;
U.S. Cl.
CPC ...
423263 ; 423 211 ;
Abstract
Hexagonal-bipyramid crystalline scandium oxide powder and a process for preparing the same are disclosed. The process comprises forming scandium oxalate from an acid aqueous solution containing scandium in the presence of chloride ions and ammonium ions, collecting the precipitate and heating the collected precipitate. Hexagonal-bipyramid crystalline scandium oxide is useful for making electron gun for cathode ray tubes.