Hiroshi Kamizuma

This inventor holds 16 USPTO granted patents and 6 published patent applications and 4 EPO patents, primarily in Power Conversion Technology. Top assignee: Hitachi, Ltd.. Active years: 2015-2026.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Hiroshi Kamizuma. Retrieved from https://idiyas.com/inventor/hiroshi-kamizuma

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Calculating rank

USPTO Granted Patents = 16 (Patent Applications = 6)

% Patents Active = 62.5

EPO Patents = 4 (Patent Applications = 9)

Average Co-Inventor Count = 4.5

ph-index = 2

Forward Citations = 14(Granted Patents)

Company Filing History:

16 out of 42,743

Hitachi, Ltd.

patents

Years Active: 2015-2026

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Areas of Expertise:

Power Conversion

Power Converter

Cooling Structure

Capacitor Device

Flight Vehicle

Power Conversion System

Power Conversion Apparatus

Heating Element

Electrical Power Conversion

Multipath-Resistance

Power Conversion Method

16 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 12752924 - Power conversion system and flight vehicle (2026-10-06),

2. 12512766 - Power conversion device (2025-12-30),

3. 12512385 - Power conversion apparatus (2025-12-30),

4. 12034379 - Power conversion system (2024-07-09),

5. 10141861 - Power conversion unit, power converter and method of manufacturing power converter (2018-11-27),

6. 10008953 - Power conversion device and power conversion method for power conversion device (2018-06-26),

7. 9948201 - Power conversion apparatus including terminals having higher resistance portions (2018-04-17),

8. 9917529 - Power conversion unit, power converter and method of manufacturing power converter (2018-03-13),

9. 9906154 - Power conversion unit and power conversion device (2018-02-27),

10. 9807913 - Cooling structure of heating element and power conversion device (2017-10-31),

11. 9755526 - Power converter (2017-09-05),

12. 9583264 - Capacitor device and electrical power conversion device (2017-02-28),

13. 9532489 - Power conversion device (2016-12-27),

14. 9497887 - Cooling structure for heating element and power converter (2016-11-15),

15. 9437797 - Cooling structure of heating element and power conversion device (2016-09-06),

Title: Innovations of Hiroshi Kamizuma

Introduction

Hiroshi Kamizuma is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of power conversion systems, holding a total of 13 patents. His work focuses on enhancing the reliability and efficiency of power conversion technologies.

Latest Patents

One of Kamizuma's latest patents is a power conversion system designed to suppress faults in short-circuiting switches that bypass fault units. This innovation enhances the reliability and redundancy of the system. The power conversion system includes multiple power converter units formed using semiconductor switch elements connected in series. It features switch elements at the input and output terminals that bypass the power converter units, along with overvoltage suppressing elements that change conducting states based on applied voltage.

Another notable patent is related to a power conversion unit and method of manufacturing a power converter. This invention aims to improve accessibility concerning the power conversion unit within a power converter. The design includes a circuit connection part with positive and negative electrode conductors, an AC conductor, and a power semiconductor module positioned strategically. The connections between the positive and negative electrode conductors of different power conversion units are also optimized for better functionality.

Career Highlights

Hiroshi Kamizuma is currently employed at Hitachi, Ltd., where he continues to innovate in the field of power conversion. His work has been instrumental in advancing technologies that are crucial for modern

Profile summary based on public USPTO records.