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. 25, 1990
Filed:
Sep. 18, 1989
Applicant:
Inventors:
Atsushi Hamamura, Kyoto, JP;
Takaki Hamada, Takatsuki, JP;
Kouki Tokuhara, Takatsuki, JP;
Yukimitsu Miyao, Fujiidera, JP;
Tomoyuki Imai, Hiroshima, JP;
Nanao Horiishi, Hiroshima, JP;
Assignees:
Sumitomo Special Metals Co., Ltd., Hiroshima, JP;
Toda Kogyo Corp., Hiroshima, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B22F / ;
U.S. Cl.
CPC ...
428548 ; 419-7 ; 419-9 ; 427408 ; 428553 ; 428557 ; 428500 ;
Abstract
A corrosion-resistant R-Fe-B type sintered permanent magnet exhibiting deterioration of not more than 5 % from the initial magnetic properties after being tested for 500 hours under the conditions of a temperature of 80.degree. C. and a relative humidity of 90 % is produced by: