Eiji Kumagai

This inventor holds 31 USPTO granted patents, plus 2 CIPO patents and 10 EPO patents, primarily in Power Storage Technology. Top assignees: Sony Corporation, Murata Manufacturing Co., Ltd.. Active years: 1991-2020.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Eiji Kumagai. Retrieved from https://idiyas.com/inventor/eiji-kumagai

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

USPTO Granted Patents = 31

% Patents Active = 80.6

CIPO Patents = 2

EPO Patents = 10 (Patent Applications = 5)

Average Co-Inventor Count = 1.5

ph-index = 9

Forward Citations = 213(Granted Patents)

Location History:

Saitama, JP (1991)
Tokyo, JP (2001)
Shinagawa-Ku, JP (2004)
Kanagawa, JP (1997 - 2018)
Fukushima, JP (2017 - 2018)
Ibaraki, JP (2020)

Company Filing History:

Murata Manufacturing Co., Ltd.

patents

Years Active: 1991-2020

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Areas of Expertise:

Charging Device

Power Storage System

Electric Vehicle

Battery Monitor Circuit

Control Method

Electric Power System

Optical Disc Device

Data Recording Device

Multi-Battery Pack

Inverter

Electric Power Supplying Apparatus

Optical Drive Apparatus

31 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 10587127 - Charging device, charging control method, electricity storage device, power storage device, power system, and electric vehicle (2020-03-10),

2. 10008862 - Power storage device, power storage system, and control method of power storage device (2018-06-26),

3. 9991702 - Control device to boot up power source (2018-06-05),

4. 9966759 - Battery monitor circuit, storage apparatus, electronic apparatus, electric-powered vehicle, and power system (2018-05-08),

5. 9929559 - Electricity storage device, electricity storage system, and method for controlling electricity storage device (2018-03-27),

6. 9698449 - Storage system and output controller (2017-07-04),

7. 9608464 - Control device, electric storage system, electronic device, electric vehicle, and electric power system to boot up a power source (2017-03-28),

8. 9608451 - Electric power supplying apparatus, electric power supplying method, inverter, and electric vehicle (2017-03-28),

9. 9419458 - Storage system, electronic device, electric vehicle and power system (2016-08-16),

10. 9270135 - Power supply apparatus and power supply switching method (2016-02-23),

11. 9178366 - Battery monitor circuit, storage apparatus, electronic apparatus, electric-powered vehicle, and power system (2015-11-03),

12. 9034511 - Power storage apparatus, connection apparatus, power storage system, electronic device, motor-driven vehicle, and electric power system (2015-05-19),

13. 9018911 - Electric circuit, charge control device, charge system, and control method (2015-04-28),

14. 8907624 - Multi-battery pack battery system with direct communication between controller and the battery packs (2014-12-09),

15. 7379406 - Optical recording apparatus, and method for controlling laser power therein by filtering and then sampling a returned light signal (2008-05-27),

Title: Innovations by Eiji Kumagai in Charging and Power Storage Technologies

Introduction

Eiji Kumagai, an accomplished inventor located in Kanagawa, Japan, holds an impressive portfolio of 31 patents. His innovative work primarily revolves around charging devices, power storage systems, and technologies aimed at enhancing electric vehicle efficiency. His contributions significantly impact the field of energy storage and management.

Latest Patents

Kumagai's latest patents include breakthroughs in charging technology. One notable invention is a charging device that features a charging voltage providing unit capable of delivering a maximum charging voltage for an electricity storage unit composed of multiple battery cells. This device operates under a specific equation that defines the maximum charging voltage based on the total battery voltage and the individual cell voltages. Additionally, he has developed a power storage device that organizes multiple modules with secondary batteries. This device includes mechanisms for controlling charging and discharging, utilizing a switch control unit to manage operation efficiently and maintain optimal performance.

Career Highlights

Eiji Kumagai has worked with prominent companies such as Sony Corporation and Murata Manufacturing Co., Ltd. Throughout his career, he has been crucial in creating technologies that support the advancement of electrical systems and battery technology. His innovative mindset and technical proficiency have propelled him to be a leading figure in his domain.

Collaborations

Kumagai has collaborated with esteemed professionals in the industry, including Kenji Nagashima and Naoyuki Sugeno. These partnerships have fostered a creative environment that enhances technological development and supports innovative solutions in the field of energy storage and charging devices.

Conclusion

Eiji Kumagai is a pioneering inventor whose work has transformed the landscape of charging and power storage technologies. With 31 patents to his name, his contributions continue to inspire advancements in the electric vehicle sector and beyond. His ongoing dedication to innovation and technology ensures that his influence will resonate in the industry for years to come.

Profile summary based on public USPTO records.