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:
Jul. 24, 2012
Filed:
Apr. 09, 2008
Applicants:
Takao Imagawa, Mito, JP;
Yuichi Satsu, Hitachi, JP;
Matahiro Komuro, Hitachi, JP;
Hiroyuki Suzuki, Hitachi, JP;
Inventors:
Takao Imagawa, Mito, JP;
Yuichi Satsu, Hitachi, JP;
Matahiro Komuro, Hitachi, JP;
Hiroyuki Suzuki, Hitachi, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01F 1/24 (2006.01);
U.S. Cl.
CPC ...
Abstract
A manufacturing method of a magnetic core includes a first step of applying a treatment liquid for forming an insulating film to iron powder; a second step of heat-treating the iron powder to which the treatment liquid has been applied, at a temperature higher than 350 degrees; a third step of compacting the heat-treated iron powder to form a magnetic core; and a forth step of heat-treating the magnetic core at a temperature ranging from 600 degrees to 800 degrees.