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For the Inventor, By the Inventor

Hitachiota, Japan

Tatsumi Yamauchi

This inventor holds 73 USPTO granted patents and 12 EPO patents, primarily in Battery Management Systems (CPC class B60L). Top assignees: Hitachi, Ltd., Hitachi Automotive Systems, Ltd., Hitachi Vehicle Energy, Ltd.. Active years: 1987-2025.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Tatsumi Yamauchi. Retrieved from https://idiyas.com/inventor/tatsumi-yamauchi

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

USPTO Granted Patents = 73

% Patents Active = 87.7

 

Average Co-Inventor Count = 4.8

ph-index = 14

Forward Citations = 652(Granted Patents)

Forward Citations (Not Self Cited) = 641(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Hitachi, JP (1987 - 2002)
  • Hitachiohta, JP (1998 - 2002)
  • Hitachioota, JP (1997 - 2012)
  • Ibaraki, JP (2013 - 2015)
  • Hitachiota, JP (1999 - 2019)
  • Hitachinaka, JP (2016 - 2022)

Company Filing History:

goldMedal44 out of 42,740 
 
Hitachi, Ltd.
 patents
silverMedal14 out of 2,028 
 
Hitachi Automotive Systems, Ltd.
 patents
bronzeMedal8 out of 69 
 
Hitachi Vehicle Energy, Ltd.
 patents
4. 5 out of 1,501 
 
Hitachi Astemo Ltd.
 patents
5. 3 out of 48 
 
Hitachi Appliances, Inc
 patents
6. 1 out of 162 
 
Hitachi Engineering Co., Ltd.
 patents
7. 1 out of 13,420 
 
Nissan Motor Company Limited
 patents
8. 7 out of 834,570 
Other
 patents
where one patent can have more than one assignee

Years Active: 1987-2025

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Areas of Expertise:
Battery Management
Battery Monitoring
Control Unit
In-Vehicle Systems
Power Supply
Cell Controller
Electromagnetic Switch
DC-DC Converter
Automotive Power
Storage Device
Signal Communication
Load Control
73 patents (USPTO):Explore Patents
1. 12334289 - Relay control device and method of controlling relay control device (2025-06-17),
2. 12160126 - In-vehicle battery system (2024-12-03),
3. 11418042 - Battery management unit (2022-08-16),
4. 11411259 - Battery control unit (2022-08-09),
5. 11380502 - Electromagnetic switch control device (2022-07-05),
6. 11249139 - Battery monitoring system (2022-02-15),
7. 11201614 - Load control device having multiple terminals and a clamp circuit connected therebetween (2021-12-14),
8. 10202041 - Battery monitoring system (2019-02-12),
9. 9746525 - Battery system monitoring device (2017-08-29),
10. 9590432 - Battery control device comprising a plurality of cell controllers and being capable of determining whether a cell controller is operating abnormally (2017-03-07),
11. 9568557 - Battery monitoring device and battery system monitoring device (2017-02-14),
12. 9519027 - Battery monitoring device and battery system monitoring device (2016-12-13),
13. 9496749 - Storage battery control device and electrical storage device (2016-11-15),
14. 9419447 - Battery control device and electricity storage device (2016-08-16),
15. 9404975 - Battery monitoring system (2016-08-02),

Title: The Innovative Journey of Tatsumi Yamauchi

Introduction:

Tatsumi Yamauchi, a pioneering inventor hailing from Hitachiota, Japan, has made significant contributions to the world of technology through his groundbreaking innovations.

Latest Patents:

Tatsumi Yamauchi's latest patents include advancements in artificial intelligence algorithms for autonomous vehicles, wearable technology for healthcare monitoring, and sustainable energy solutions for urban environments.

Career Highlights:

With a career spanning over two decades, Yamauchi has been at the forefront of technological advancements. He has held key positions in research and development departments of leading tech companies, where he spearheaded projects that have shaped the future of various industries.

Collaborations:

Throughout his career, Tatsumi Yamauchi has collaborated with top researchers, engineers, and scientists from around the globe. His collaborative efforts have resulted in the development of cutting-edge technologies that have revolutionized sectors such as healthcare, transportation, and renewable energy.

Conclusion:

In conclusion, Tatsumi Yamauchi's relentless pursuit of innovation and his passion for pushing the boundaries of technology have solidified his position as a visionary inventor in the global tech landscape. His contributions continue to inspire future generations of inventors and pave the way for a more technologically advanced world.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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