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:
Jun. 25, 1991
Filed:
Jun. 22, 1989
Applicant:
Inventors:
Teruo Suzuki, Tokyo, JP;
Matsuo Kishi, Tokyo, JP;
Katsuyoshi Muraishi, Tokyo, JP;
Kenichi Ogawa, Tokyo, JP;
Hiroshi Takashio, Tokyo, JP;
Assignee:
Seiko Instruments Inc., , JP;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B22F / ;
U.S. Cl.
CPC ...
419 12 ; 419 27 ; 419 38 ; 419 66 ; 148101 ;
Abstract
The invention relates to a method of making permanent magnets, especially rare-earth ion permanent magnets composed of compacted Fe-B-R type alloy particles. Accordingly, the method provides compacting the magnetic particles into a desired shape having voids between some of the compacted particles. The voids between the particles are filled with a sealing agent and the compact is further coated with either an organic coating or metallic coating.