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:
Feb. 05, 1991
Filed:
Mar. 22, 1988
Applicant:
Inventor:
Floyd E Camp, Trafford, PA (US);
Assignee:
Crucible Materials Corporation, Pittsburgh, PA (US);
Primary Examiner:
Int. Cl.
CPC ...
B22F / ;
U.S. Cl.
CPC ...
419 30 ; 75352 ; 75359 ; 75364 ; 148301 ; 148302 ;
Abstract
Particles for the production of permanent magents are obtained by producing an article having Ca and a rare earth oxide including at least Nd oxide. The article is heated to effect Ca rare earth oxide reduction. Thereafter, particles of -60 mesh or finer are formed from this article. Leaching of Ca from the particles is achieved by contacting the particles with an organic acid having at least 3 carbon atoms, preferably propionic or butanoic acid.