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:
Apr. 25, 2000
Filed:
May. 27, 1997
Yuichi Satsu, Hitachi, JP;
Hideaki Katayama, Hitachi, JP;
Yuzo Ito, Mito, JP;
Akio Takahashi, Hitachiota, JP;
Noboru Baba, Hitachiota, JP;
Chikara Tanaka, Hitachi, JP;
Kazuo Asaka, Matsudo, JP;
Chio Ishihara, Matsudo, JP;
Hiroaki Miyata, Hitachi, JP;
Kazuhiro Satou, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Powdered Metals, Co., Ltd., Chiba-ken, JP;
Abstract
The present invention provides a soft magnetic powder composite core for an electric apparatus produced with soft magnetic particles having electric insulating layers on the surfaces thereof, wherein said electric insulating layers are formed by mixing said soft magnetic particles with an insulating layer-forming solution which comprises a phosphating solution and a rust inhibitor, which is an organic compound containing at least one of nitrogen or sulfur having a lone pair of electrons suppressing the formation of iron oxide and surfactant, and drying the treated soft magnetic particles at a predetermined temperature. The soft magnetic powder composite core is excellent in iron loss and magnetic flux density.