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:
Nov. 01, 1994
Filed:
Dec. 16, 1992
Applicant:
Inventors:
Hideki Kawai, Kumagaya, JP;
Katsuhiko Kojo, Fukaya, JP;
Kiyoshi Eguchi, Kumagaya, JP;
Yoshiko Ogawa, Kumagaya, JP;
Assignee:
Hitachi Metals, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B22F / ; B22F / ;
U.S. Cl.
CPC ...
428548 ; 428552 ; 427127 ;
Abstract
A permanent magnet formed by a permanent magnet alloy of R--T--B system chiefly comprising a transition metal T, a rare earth element R including yttrium and boron B, and coated with a protective plating layer of Ni or an Ni alloy, wherein said protective plating layer is 30 .mu.m or less in thickness, and the inter-cell pitch in the surface of said protective plating layer is 14 .mu.m or more.