Inductor devices – Core
Reexamination Certificate
2005-09-06
2005-09-06
Nguyen, Tuyen T (Department: 2832)
Inductor devices
Core
C148S306000, C148S104000
Reexamination Certificate
active
06940388
ABSTRACT:
A dust core consists essentially of ferromagnetic powder; and an insulating binder, in which the ferromagnetic powder is dispersed; wherein the insulating binder is a silicone resin comprising a trifunctional alkyl-phenyl silicone resin and optionally containing an inorganic insulator such as an inorganic oxide, carbide or nitride. Preferably the alkyl-phenyl silicone resin is a methyl-phenyl silicone resin and comprises about 20 to 70 mol % of trifunctional groups. The dust core can be produced by pressure-molding a ferromagnetic powder, a lubricant and a trifunctional alkyl-phenyl silicone resin binder and heat treating the molded core at a temperature in the range of about 300 to about 800 ° C. for a time period in the range of about 20 minutes to about 2 hours in a non-oxidizing atmosphere. The dust core has high magnetic permeability representing the direct current superimposition characteristics, has reduced core loss and has increased mechanical strength.
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Nguyen Tuyen T
Olson & Hierl Ltd.
TDK Corporation
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