Tetsuji Shiseki

Title: Tetsuji Shiseki: Soft Magnetic Alloy Powder Innovation

Introduction

Tetsuji Shiseki is an inventor associated with Fukushima, Japan, and Mitsubishi Steel Mfg. Co., Ltd. His patent work addresses soft magnetic alloy powder designed to reduce energy loss and support operation at higher frequencies and larger currents.

Latest Patents

The available information lists one patent for Shiseki: “Soft Magnetic Alloy Powder and Production Method Therefor.” The invention concerns an Fe–Cr–Si-based soft magnetic alloy powder in which the chromium content gradually decreases from the particle surface to a specified depth. The alloy contains 3 to 6.5 percent silicon by weight and may contain 1 to 5 percent chromium by weight, along with optional manganese, phosphorus, sulfur, or oxygen. The chromium oxide-to-metallic chromium ratio may also gradually decrease inward from the surface. These features are intended to reduce losses in powder used for dust cores, helping the material meet the demands of higher-frequency and higher-current applications.

Career Highlights

Shiseki’s listed patent reflects work on alloy composition and particle-surface characteristics for soft magnetic materials. His affiliation with Mitsubishi Steel Mfg. Co., Ltd. connects this invention to the company’s materials and manufacturing activities. The supplied information identifies 1 patent associated with him.

Collaborations

Michitaka Aihara and Seiichi Saito are identified as Shiseki’s coworkers. The available details do not specify their roles in the patent or the nature of their collaboration.

Conclusion

Tetsuji Shiseki’s documented invention focuses on improving soft magnetic alloy powder through controlled chromium distribution and composition, with the goal of reducing core losses in demanding electrical applications.