Inventor

UTSUMI TOMOYUKI

JP4 patents

⚠️ This page may combine multiple inventors who share the name “UTSUMI TOMOYUKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

HITACHI LTD

2 patents

US6580108B1Jun 17, 2003

Insulated gate bipolar transistor decreasing the gate resistance

HITACHI LTD44 citations89

US7859210B2Dec 28, 2010

Semiconductor device for driving motor, three-phase motor and motor driving apparatus with the semiconductor device and fan motor

HITACHI LTD10 citations80

HITACHI POWER SEMICONDUCTOR DEVICE LTD

2 patents

US12592651B2Mar 31, 2026

Rectifier circuit and power supply using same

HITACHI POWER SEMICONDUCTOR DEVICE LTD0 citations50

US12549109B2Feb 10, 2026

Rectifier circuit and power supply using the same

HITACHI POWER SEMICONDUCTOR DEVICE LTD0 citations50