Miyoshi, Japan

Kenji Umayahara

This inventor holds 63 USPTO granted patents, plus 9 CIPO patents and 5 EPO patents, primarily in Fuel Cell Systems (CPC class H01M). Top assignee: Toyota Jidosha Kabushiki Kaisha. Active years: 2005-2022.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Kenji Umayahara. Retrieved from https://idiyas.com/inventor/kenji-umayahara

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


% Patents Active = 82.5


 

Average Co-Inventor Count = 2.2

ph-index = 4

Forward Citations = 105(Granted Patents)

Forward Citations (Not Self Cited) = 98(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Susono, JP (2005 - 2012)
  • Aichi, JP (2011 - 2015)
  • Nishikamo-gun, JP (2010 - 2018)
  • Miyoshi, JP (2014 - 2022)

Company Filing History:


Years Active: 2005-2022

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Areas of Expertise:
Fuel Cell System
Hydrogen Supply
Electric Power System
Regenerative Braking
Control Method
Energy Generation
Biomass
Voltage Control
Electric Vehicle
Air Compressor Control
Power Control Method
Vehicle Control
63 patents (USPTO):Explore Patents

Title: Kenji Umayahara: A Pioneer in Fuel Cell Technology

Introduction: Kenji Umayahara is a prominent inventor based in Miyoshi, Japan, known for his remarkable contributions to fuel cell technology. With a total of 63 patents to his name, Umayahara has established himself as a leading figure in the field of innovations focused on sustainable energy solutions.

Latest Patents: Among his latest innovations, Umayahara has developed a sophisticated fuel cell system designed to efficiently supply electric power. This system includes a fuel cell and a control unit that sets target electric power generation based on the requirements of the load. Notably, the control unit is adept at executing a fluctuation suppression process, which minimizes the variations in target electric power compared to the fluctuation of requested electric power. Furthermore, his hydrogen supply system enhances transportation sustainability by enabling a hydrogen station to supply hydrogen to fuel cell-powered trains, facilitating an innovative approach to energy-efficient transport.

Career Highlights: Kenji Umayahara is currently affiliated with Toyota Jidosha Kabushiki Kaisha, where he continues to push the boundaries of automotive technology through his inventive work. His dedication and innovative mindset have made significant strides in advancing fuel cell technology, positioning Toyota at the forefront of the automotive industry's shift towards cleaner energy solutions.

Collaborations: Throughout his career, Umayahara has collaborated with esteemed colleagues, including Michio Yoshida and Mitsuhiro Nada. These partnerships have fostered an environment of creativity and teamwork, enabling the development of groundbreaking inventions that address modern energy challenges.

Conclusion: Kenji Umayahara's work in fuel cell technology represents a commitment to innovation and sustainability. With his extensive portfolio of patents and collaborative efforts, he is not only shaping the future of energy solutions but also contributing to a cleaner and more efficient world. As a testament to his impact, Umayahara's contributions will continue to influence the landscape of renewable energy technologies for years to come.

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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