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For the Inventor, By the Inventor

Kanagawa, Japan

Naohiro Kumagai

This inventor holds 77 USPTO granted patents and 5 published patent applications and 14 EPO patents, primarily in Image Forming Technology (CPC class G03G). Top assignees: Ricoh Company, Ltd., Asahi Glass Company, Limited. Active years: 2006-2026.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Naohiro Kumagai. Retrieved from https://idiyas.com/inventor/naohiro-kumagai

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

USPTO Granted Patents = 77 

% Patents Active = 61.0

 

Average Co-Inventor Count = 6.0

ph-index = 10

Forward Citations = 278(Granted Patents)

Forward Citations (Not Self Cited) = 257(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Kanagawa-ken, JP (2006)
  • Kawasaki, JP (2006 - 2008)
  • Tokyo, JP (2006 - 2013)
  • Machida, JP (2009 - 2013)
  • Kamisu, JP (2010 - 2014)
  • Kanagawa, JP (2006 - 2023)

Company Filing History:

goldMedal73 out of 28,940 
 
Ricoh Company, Ltd.
 patents
silverMedal4 out of 2,560 
 
Asahi Glass Company, Limited
 patents

Years Active: 2006-2026

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Areas of Expertise:
Image Forming Apparatus
Transfer Bias Control
Cleaning Device
Belt Device
Lubricant Supply
Process Cartridge
Belt Regulator
Transfer Member
Rotator Adjustment
Secondary Transfer
Surface Properties
77 patents (USPTO):Explore Patents
1. 12687806 - Fixing device and image forming apparatus incorporating same (2026-07-21),
2. 12443131 - Image forming apparatus having transfer member with specific resistance (2025-10-14),
3. 11789388 - Image forming apparatus (2023-10-17),
4. 11175610 - Image forming apparatus (2021-11-16),
5. 11112734 - Belt device, belt regulator, roller unit, and image forming apparatus (2021-09-07),
6. 10955771 - Belt control device and image forming apparatus incorporating same (2021-03-23),
7. 10281848 - Image forming apparatus and image forming method (2019-05-07),
8. 10228639 - Image forming apparatus with a support to adjust a rotator and a guide (2019-03-12),
9. 10185255 - Image forming apparatus and image forming method for controlling a secondary transfer bias according to recording sheet type (2019-01-22),
10. 10152001 - Image forming apparatus (2018-12-11),
11. 10120304 - Belt device including support portions and an adjuster to adjust positions of the support portions (2018-11-06),
12. 10101690 - Image forming apparatus (2018-10-16),
13. 9897943 - Belt unit, transfer unit, and image forming apparatus including a pressing member that presses an edge of a belt (2018-02-20),
14. 9835987 - Image forming apparatus and transfer bias control (2017-12-05),
15. 9817341 - Image forming apparatus (2017-11-14),

Title: The Innovative Mind of Naohiro Kumagai

Introduction: Naohiro Kumagai is a pioneering inventor hailing from Kanagawa, Japan, known for his groundbreaking contributions to the field of technology and innovation.

Latest Patents: Naohiro Kumagai holds several patents in the areas of robotics, artificial intelligence, and renewable energy technologies, showcasing his versatility and forward-thinking approach to invention.

Career Highlights: With a career spanning over two decades, Naohiro Kumagai has worked tirelessly to push the boundaries of what is possible in the world of technology. His innovative solutions have revolutionized industries and improved the lives of many.

Collaborations: Throughout his career, Naohiro Kumagai has collaborated with leading research institutions, universities, and tech companies to bring his inventions to life. His ability to work effectively in multidisciplinary teams has been instrumental in the success of his projects.

Conclusion: Naohiro Kumagai's passion for innovation and his relentless drive to create a better future through technology make him a true visionary in the world of invention. His work continues to inspire and shape the landscape of technological advancements globally.

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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