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. 18, 2007
Filed:
Nov. 19, 2004
Yoshiaki Nishijima, Toyokawa, JP;
Yurio Nomura, Nagoya, JP;
Kouichi Yamaguchi, Kyoto, JP;
Yuuichi Ishikawa, Kyoto, JP;
Hidekazu Hayama, Kyoto, JP;
Yoshiaki Nishijima, Toyokawa, JP;
Yurio Nomura, Nagoya, JP;
Kouichi Yamaguchi, Kyoto, JP;
Yuuichi Ishikawa, Kyoto, JP;
Hidekazu Hayama, Kyoto, JP;
DENSO Corporation, Kariya, JP;
Abstract
The invention provides a method for manufacturing a soft magnetic powder material covered by oxide layers at surfaces of the powder, by using a soft magnetic alloy powder containing a soft magnetic powder material and a second element such as Si having an oxidizing reactivity higher than iron, and heating the soft magnetic alloy powder in an atmosphere of a weak oxidizing gas by mixing a weak oxidizing gas in an inert gas, and oxidizing selectively the second element at surface layers of the powder while restraining an oxidation of iron to form thin oxide layers with high electrical resistance.