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:
Mar. 19, 2013
Filed:
Jul. 08, 2010
Applicants:
Kohei Muramatsu, Kashiwa, JP;
Chio Ishihara, Tokyo, JP;
Masaki Yanaka, Matsudo, JP;
Inventors:
Assignee:
Hitachi Powdered Metals Co., Ltd., Chiba, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01F 1/24 (2006.01);
U.S. Cl.
CPC ...
Abstract
A powder mixture, which contains a soft magnetic powder and an insulating powder lubricant in an amount of 0.1% by mass or more relative to the soft magnetic powder, is formed by compacting at a compacting pressure of 800 MPa or less, thereby obtaining a powder compact that has a space factor of the soft magnetic powder of 93% or more. The powder compact can be used as a soft magnetic powdered core. The soft magnetic powdered core has a specific resistance or 10,000 μΩcm or more. A powder of a metal soap such as barium stearate or lithium stearate is used as the insulating powder lubricant.