Masakazu Ishikawa

This inventor holds 14 USPTO granted patents and 9 published patent applications, plus 6 CIPO patents and 2 EPO patents, primarily in Power Conversion Technology. Top assignees: Hitachi, Ltd., Hitachi Information & Control Solutions, Ltd., Lintec Corporation. Active years: 2009-2025.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Masakazu Ishikawa. Retrieved from https://idiyas.com/inventor/masakazu-ishikawa-d9hzef34

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

Calculating rank

USPTO Granted Patents = 14 (Patent Applications = 9)

% Patents Active = 64.3

CIPO Patents = 6

EPO Patents = 2 (Patent Applications = 11)

Average Co-Inventor Count = 2.7

ph-index = 1

Forward Citations = 6(Granted Patents)

Location History:

Hitachi, JP (2009 - 2015)
Tokyo, JP (2021 - 2023)

Company Filing History:

Hitachi Information & Control Solutions, Ltd.

Hitachi Mitsubishi Hydro Corporation

patents

5. 1 out of 30

Hitachi Industrial Products, Ltd.

patents

6. 1 out of 50

Hitachi Industry & Control Solutions, Ltd.

patents

where one patent can have more than one assignee

Years Active: 2009-2025

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Areas of Expertise:

Power Converter

Generator-Motor

Dielectric Heating

Bonding Film

Adhesive Structure

Control System

Fault Diagnosis

Task Management

Communication Control

Analog Input/Output

Modular Multilevel

High-Frequency Adhesive

14 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 12355377 - Adjustable speed generator motor system with full power converter (2025-07-08),

2. 12289063 - Modular multilevel power converter and variable speed generator-motor (2025-04-29),

3. 11673340 - Dielectric-heating bonding film and bonding method using dielectric-heating bonding film (2023-06-13),

4. 11542415 - High-frequency dielectric heating adhesive sheet, and adhesion method in which same is used (2023-01-03),

5. 11541607 - Dielectric-heating bonding film and bonding method using dielectric-heating bonding film (2023-01-03),

6. 11530338 - Method for dismantling adhesive structure (2022-12-20),

7. 11007722 - Dielectric-heating bonding film and joining method using dielectric-heating bonding film (2021-05-18),

8. 9208037 - Duplexed operation processor control system, and duplexed operation processor control method (2015-12-08),

9. 8493927 - Control apparatus, control method and control program (2013-07-23),

10. 8386862 - Fault diagnosis apparatus and fault diagnosis method of multi-channel analog input/output circuit (2013-02-26),

11. 8209594 - Sending device, receiving device, communication control device, communication system, and communication control method (2012-06-26),

12. 8161362 - Task management control apparatus and method, having redundant processing comparison (2012-04-17),

13. 7873871 - Communication control system and communication control method (2011-01-18),

14. 7555627 - Input-output control apparatus, input-output control method, process control apparatus and process control method (2009-06-30),

Title: Masakazu Ishikawa: Innovator in Power Conversion Technologies

Introduction

Masakazu Ishikawa is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of power conversion technologies, holding a total of 14 patents. His work focuses on developing advanced systems that enhance the efficiency and stability of electrical power generation and conversion.

Latest Patents

Ishikawa's latest patents include an adjustable speed generator motor system with a full power converter. This innovative system features two 3-level converters connected back-to-back on the DC side. It incorporates a mode that allows a fly-wheeling diode to conduct current independently for three phases based on current polarity and magnitude. This design ensures the FPC system can maintain stable operation. Another notable patent is for a modular multilevel power converter and variable speed generator-motor. This converter includes a capacitor voltage adjuster, an active power detector, and multiple active power command suppressors, all working together to optimize power management.

Career Highlights

Throughout his career, Ishikawa has worked with leading companies in the industry, including Hitachi, Ltd. and Hitachi Information & Control Solutions, Ltd. His experience in these organizations has allowed him to develop and refine his innovative ideas in power conversion.

Collaborations

Ishikawa has collaborated with notable colleagues such as Akira Bando and Shin Kokura. These partnerships have contributed to the advancement of his projects and the successful implementation of his inventions.

Conclusion

Masakazu Ishikawa's contributions to power conversion technologies have established him as a key figure in the field. His innovative patents and collaborations reflect his commitment to advancing electrical engineering.

Profile summary based on public USPTO records.