Tomomasa Nishikawa

This inventor holds 79 USPTO granted patents and 37 published patent applications, plus 4 CIPO patents and 33 EPO patents, primarily in Battery Pack Technology (CPC class H01M). Top assignees: Hitachi Koki Co., Ltd., Koki Holdings Co., Ltd., Hitachi Koko Co., Ltd.. Active years: 2003-2025.

USPTO Granted Patents = 79 (Patent Applications = 37)

% Patents Active = 65.8

CIPO Patents = 4 (Patent Applications = 3)

EPO Patents = 33 (Patent Applications = 47)

Average Co-Inventor Count = 3.4

ph-index = 14

Forward Citations = 2,400(Granted Patents)

Forward Citations (Not Self Cited) = 2,346(Dec 10, 2025)

Inventors with similar research interests:

Location History:

Hitachinaka, JP (2003 - 2022)
Ibaraki, JP (2012 - 2024)

Company Filing History:

49 out of 1,267

Hitachi Koki Co., Ltd.

patents

29 out of 212

Koki Holdings Co., Ltd.

patents

1 out of 10

Hitachi Koko Co., Ltd.

patents

Years Active: 2003-2025

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Areas of Expertise:

Battery Pack

Electrical Apparatus

Electric Tool

Power Tool

Work Machine

Impact Tool

Portable Blower

Cutting Machine

Abnormality Reporting

Rotary Impact Tool

Electric Device System

Power Supply Device

79 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 12491621 - Electrical equipment and electrical equipment system (2025-12-09),

2. 12420400 - Battery pack and electrical device (2025-09-23),

3. 12125994 - Electrical apparatus using battery pack (2024-10-22),

4. 12074296 - Battery pack, electric apparatus using battery pack, and electric apparatus main body (2024-08-27),

5. 12046721 - Battery pack and electric apparatus using battery pack (2024-07-23),

6. 11837741 - Electrical apparatus using battery pack (2023-12-05),

7. 11824169 - Battery pack, electrical device using battery pack, and electrical device system (2023-11-21),

8. 11757293 - Battery pack, and electric appliance using battery pack (2023-09-12),

9. 11745272 - Electrical device system, electrical device, and power supply device (2023-09-05),

10. 11710860 - Battery pack and electrical apparatus using battery pack (2023-07-25),

11. RE49414 - Power tool (2023-02-13),

12. 11469699 - Work device (2022-10-11),

13. 11418094 - Electric tool (2022-08-16),

14. 11411277 - Battery pack, power tool, and battery pack and power tool set (2022-08-09),

15. 11367907 - Battery pack and electric apparatus using battery pack (2022-06-21),

As an AI assistant specializing in innovations, inventions, inventors, patent attorneys, assignees, and patents, I've compiled an article about the esteemed inventor, Tomomasa Nishikawa.

Title: The Pioneering Spirit of Tomomasa Nishikawa in Technology Innovation

Introduction:

Tomomasa Nishikawa, a visionary inventor hailing from Hitachinaka, JP, has left an indelible mark on the world of technology with his exceptional talent and relentless passion for innovation.

Latest Patents:

Among his impressive portfolio of 74 patents, Tomomasa Nishikawa's recent inventions include an electrical apparatus utilizing battery packs. This innovative apparatus allows for seamless switching between series and parallel connection states, enhancing efficiency and reducing wear on terminals.

Career Highlights:

Having worked with renowned companies such as Hitachi Koki Co., Ltd. and Koki Holdings Co., Ltd., Nishikawa's career has been distinguished by a series of groundbreaking inventions that have reshaped the technological landscape.

Collaborations:

Throughout his career, Tomomasa Nishikawa has collaborated closely with esteemed colleagues such as Haruhisa Fujisawa and Yoshitaka Akiba. Together, they have pushed the boundaries of innovation and set new standards in the industry.

Conclusion:

Tomomasa Nishikawa's legacy as a pioneering figure in technology is a testament to his unwavering commitment to pushing the boundaries of what is possible. His remarkable inventions have not only transformed industries but have also inspired a new generation of inventors to reach for the stars and revolutionize the world around them.