Dowa has been granted a patent for a silicon oxide-coated iron powder characterized by a small particle diameter and high insulating properties. The production method involves coating iron powder with silicon oxide, resulting in enhanced performance in high-frequency applications and specific resistivity measurements. GlobalData’s report on Dowa gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Dowa, 3D memory devices was a key innovation area identified from patents. Dowa's grant share as of July 2024 was 45%. Grant share is based on the ratio of number of grants to total number of patents.
Silicon oxide-coated iron powder with high insulating properties
The granted patent US12057260B2 introduces a silicon oxide-coated iron powder characterized by specific physical and chemical properties. The iron particles within this powder have an average diameter ranging from 0.25 µm to 0.80 µm and an average axial ratio of 1.5 or less. The coating of silicon oxide on the iron particles results in a volume resistivity of at least 1.0×10^5 O·cm when subjected to a voltage of 10 V during vertical compression molding at 64 MPa. Notably, the iron particles contain less than 0.1 mass % of silicon, while the silicon oxide coating comprises between 1.0% and 10% by mass of silicon.
Additionally, the patent outlines that the silicon oxide-coated iron powder may contain phosphorus (P) in the iron particles, with a permissible range of 0.1% to 1.0% by mass. The claims also extend to applications of this silicon oxide-coated iron powder in the creation of molded bodies for inductors, as well as the inductors themselves, indicating its potential utility in electronic components. The specific parameters and compositions detailed in the claims suggest a focus on enhancing the performance characteristics of the iron powder for use in various technological applications.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.