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For the Inventor, By the Inventor

Hitachi, Japan

Tohru Koyama

This inventor holds 15 USPTO granted patents, plus 1 CIPO patent. Top assignees: Hitachi, Ltd., Hitachi Chemical Company, Ltd.. Active years: 1978-2010.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Tohru Koyama. Retrieved from https://idiyas.com/inventor/tohru-koyama

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

USPTO Granted Patents = 15

% Patents Active = 66.7


Average Co-Inventor Count = 4.1

ph-index = 5

Forward Citations = 96(Granted Patents)


Location History:

  • Hitachishi, JP (1998)
  • Hitachi, JP (1978 - 2010)

Company Filing History:

goldMedal13 out of 42,726 
 
Hitachi, Ltd.
 patents
silverMedal3 out of 1,641 
 
Hitachi Chemical Company, Ltd.
 patents
where one patent can have more than one assignee

Years Active: 1978-2010

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15 patents (USPTO):Explore Patents
1. 7659028 - Polymer electrolyte fuel cell (2010-02-09),
2. 7541107 - Solid polyelectrolyte, assembly of membrane and electrodes, amd fuel cell (2009-06-02),
3. 7425383 - Electrode for polymer electrolyte fuel cell, separator therefore, and polymer electrolyte fuel cell, and generating system using them (2008-09-16),
4. 7279244 - Fuel cell, polyelectrolyte and ion-exchange resin use for same (2007-10-09),
5. 7022743 - Fuel cell, polyelectrolyte and ion-exchange resin used for same (2006-04-04),
6. 6989212 - Fuel cell, polyelectrolyte and ion-exchange resin used for same (2006-01-24),
7. 6893764 - Solid polyelectrolyte, assembly of membrane and electrodes, and fuel cell (2005-05-17),
8. 5982056 - Thermosetting resin composition, electrically insulated coil, electric (1999-11-09),
9. 5733402 - Method for producing electrically insulated coils (1998-03-31),
10. 5324767 - Thermosetting resin composition for casting high-voltage coil, and (1994-06-28),
11. 5166283 - Polymer having dihydropyridine rings or dihydrotriazine rings, process (1992-11-24),
12. 4448940 - Thermosetting resin composition and prepolymer thereof (1984-05-15),
13. 4369288 - Odorless or low-odor crosslinkable compound and resin composition (1983-01-18),
14. 4297471 - Odorless or low-odor crosslinkable compound and resin composition (1981-10-27),
15. 4129554 - Thermosettable, polymerizable resin composition comprising a polyepoxide (1978-12-12),

Title: Tohru Koyama: Innovator in Polymer Electrolyte Fuel Cells

Introduction

Tohru Koyama is a prominent inventor based in Hitachi, Japan. He has made significant contributions to the field of polymer electrolyte fuel cells, holding a total of 15 patents. His work focuses on enhancing the durability and efficiency of fuel cell technology.

Latest Patents

Koyama's latest patents include innovations in polymer electrolyte fuel cells. One notable invention provides an electrode for a polymer electrolyte fuel cell that integrates a solid polymer electrolyte membrane, electrode layers, reinforcing members, and a sealing member. This design aims to improve the overall performance and reliability of fuel cells. Another significant patent addresses the development of a highly durable solid polymer electrolyte. This electrolyte is designed to have a deterioration resistance that meets or exceeds that of traditional fluorine-containing solid polymer electrolytes, while also being cost-effective.

Career Highlights

Throughout his career, Koyama has worked with notable companies such as Hitachi, Ltd. and Hitachi Chemical Company, Ltd. His experience in these organizations has allowed him to refine his expertise in fuel cell technology and contribute to advancements in the field.

Collaborations

Koyama has collaborated with esteemed colleagues, including Tomoichi Kamo and Toshiyuki Kobayashi. These partnerships have fostered innovation and have been instrumental in the development of his patented technologies.

Conclusion

Tohru Koyama's contributions to polymer electrolyte fuel cells demonstrate his commitment to innovation and excellence in engineering. His patents reflect a deep understanding of the challenges in fuel cell technology and a dedication to finding practical solutions.

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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