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For the Inventor, By the Inventor

Toyokawa, Japan

Toshihiko Igashira

This inventor holds 91 USPTO granted patents, primarily in Fuel Injection Technology (CPC class 123549). Top assignees: Nippon Soken, Inc., Toyota Jidosha Kabushiki Kaisha, Toyota Jidosha Kogyo Kabushiki Kaisha. Active years: 1976-2007.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Toshihiko Igashira. Retrieved from https://idiyas.com/inventor/toshihiko-igashira

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

USPTO Granted Patents = 91

% Patents Active = 97.8

Average Co-Inventor Count = 4.1

ph-index = 23

Forward Citations = 1,443(Granted Patents)

Forward Citations (Not Self Cited) = 1,416(Dec 10, 2025)


Inventors with similar research interests:


    Location History:

    • Toyokawa, JA (1976 - 1977)
    • Toyokama, JP (1995)
    • Toyokawa, JP (1979 - 2007)

    Company Filing History:

    goldMedal78 out of 1,600 
     
    Nippon Soken, Inc.
     patents
    silverMedal20 out of 38,912 
     
    Toyota Jidosha Kabushiki Kaisha
     patents
    bronzeMedal9 out of 1,838 
     
    Toyota Jidosha Kogyo Kabushiki Kaisha
     patents
    4. 7 out of 20,407 
     
    Denso Corporation
     patents
    5. 5 out of 3,252 
     
    Nippondenso Co., Ltd.
     patents
    where one patent can have more than one assignee

    Years Active: 1976-2007

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    Areas of Expertise:
    Fuel Injection System
    Hydraulic Control Device
    Electromagnetic Valve
    Cooling System
    Common-Rail Technology
    Exhaust Gas Purification
    Solenoid Valve
    Oxygen Concentration Detection
    Internal Combustion Engine
    Electrostrictive Actuator
    Diesel Injection Control
    Piezoelectric Flow Control
    91 patents (USPTO):Explore Patents
    1. 7185828 - Hydraulic control device, system and method for controlling actuator device (2007-03-06),
    2. 6895940 - Hydraulic control device, system and method for controlling actuator device (2005-05-24),
    3. 6840466 - Hydraulic control valve and fuel injector using same (2005-01-11),
    4. 6729554 - Structure of fuel injector for avoiding injection of excess quantity of fuel (2004-05-04),
    5. 6679440 - Valve actuating device and fuel injector using same (2004-01-20),
    6. 6367453 - Fuel injection valve (2002-04-09),
    7. 6311674 - Fuel injection system for internal combustion engine (2001-11-06),
    8. 5749330 - Cooling system for an internal combustion engine (1998-05-12),
    9. 5638791 - Common-rail fuel injection system for an engine (1997-06-17),
    10. 5582805 - Electrically heated catalytic apparatus (1996-12-10),
    11. 5582803 - Electrically heated catalytic apparatus (1996-12-10),
    12. 5517959 - Lubricating apparatus for an engine (1996-05-21),
    13. 5503364 - Solenoid valve (1996-04-02),
    14. 5501194 - Fuel injection apparatus (1996-03-26),
    15. 5497619 - Exhaust gas purification apparatus (1996-03-12),

    Title: The Innovative Journey of Toshihiko Igashira

    Introduction: Toshihiko Igashira, a pioneering inventor hailing from Toyokawa, Japan, has made significant contributions to the field of technology through his groundbreaking inventions and patents.

    Latest Patents: Toshihiko Igashira's latest patents showcase his continuous dedication to innovation in areas such as robotics, artificial intelligence, and renewable energy technologies.

    Career Highlights: Throughout his illustrious career, Toshihiko Igashira has been recognized for his inventive spirit and problem-solving skills, leading to the development of cutting-edge solutions that have revolutionized various industries.

    Collaborations: Toshihiko Igashira has collaborated with leading research institutions, universities, and tech companies to further his inventions and bring them to the market, solidifying his reputation as a visionary inventor.

    Conclusion: Toshihiko Igashira's passion for innovation and his relentless pursuit of excellence have established him as a trailblazing inventor whose work continues to inspire future generations in the ever-evolving landscape of technology.

    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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