Core having superior end face insulation and method of...

Details Core having superior end face insulation and method of... Core having superior end face insulation and method of...

2007-01-12

2008-12-30

Nguyen, Tuyen T. (Department: 2832)

Inductor devices

Core

Reexamination Certificate

active

07471182

ABSTRACT:
A means for treating the end faces of a core which is used for an electrical apparatuses and etc., to give insulation extremely superior in effect of improvement of the insulation, corrosion resistance, adhesiveness, heat resistance, and magnetic properties at a low temperature in a short time without cleaning for removing punching oil, annealing, or other pre-treatment; a core having an insulation coating comprised of a dry film of a pure silicone polymer, modified silicone polymer, and/or mixed silicone polymer as a silicone compound on the core end faces and having an average film thickness of at least 0.5 μm, a breakdown voltage of at least 30V, and a heat resistance in the air of at least 400° C.; and a method of production comprised of forming a core, then dipping it in or spraying it by one or more types of a pure silicone polymer, modified silicone polymer, and/or mixed silicone polymer as an insulation coating.

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Japanese Office Action dated May 30, 2008 issued in corresponding Japanese Patent Application No. 2002-277578.

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