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For the Inventor, By the Inventor

Machida, Japan

Kiyofumi Nagai

This inventor holds 82 USPTO granted patents and 3 published patent applications and 39 EPO patents, primarily in Inkjet Technology (CPC class C09D11-322). Top assignees: Ricoh Company, Ltd., Hokuetsu Kishu Paper Co., Ltd., Nippon Paper Industries Co., Ltd.. Active years: 1987-2020.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Kiyofumi Nagai. Retrieved from https://idiyas.com/inventor/kiyofumi-nagai

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

USPTO Granted Patents = 82 

% Patents Active = 82.9

 

Average Co-Inventor Count = 4.0

ph-index = 24

Forward Citations = 1,653(Granted Patents)

Forward Citations (Not Self Cited) = 1,141(Dec 10, 2025)


Inventors with similar research interests:

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Location History:

  • Numazu, JP (1987 - 1988)
  • Ohta-ku, JP (2005)
  • Machida, JP (1992 - 2013)
  • Kanagawa, JP (2018)
  • Tokyo, JP (1995 - 2020)

Company Filing History:

goldMedal82 out of 28,951 
 
Ricoh Company, Ltd.
 patents
silverMedal1 out of 5 
 
Hokuetsu Kishu Paper Co., Ltd.
 patents
bronzeMedal1 out of 343 
 
Nippon Paper Industries Co., Ltd.
 patents
4. 1 out of 141 
 
Tokyo University of Science Foundation
 patents
where one patent can have more than one assignee

Years Active: 1987-2020

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Areas of Expertise:
Inkjet Ink
Ink Cartridge
Recording Method
Aqueous Ink
Colorant Composition
Image Forming Apparatus
Pigment Dispersion
Cleaning Filling Liquid
Variable Printing Medium
Ink Media Set
Recording Apparatus
82 patents (USPTO):Explore Patents
1. 10703911 - Organic colorant, coloring composition, and inkjet ink (2020-07-07),
2. 9879207 - Cleaning filling liquid, cartridge, cleaning filling method, and inkjet recording device (2018-01-30),
3. 9518190 - Inkjet ink, ink cartridge, inkjet recording method, inkjet recording device, and inkjet recorded matter (2016-12-13),
4. 9163160 - Aqueous ink for inkjet, ink cartridge, and inkjet recording device (2015-10-20),
5. 9085706 - Inkjet ink, ink cartridge, inkjet recording method, inkjet recording device, and inkjet recorded matter (2015-07-21),
6. 9062217 - Liquid composition, recording method, and recorded matter (2015-06-23),
7. 9034091 - Inkjet recording ink set, inkjet recording method, and recorded matter (2015-05-19),
8. 9028600 - Inkjet ink, inkjet recording method, and inkjet recording device (2015-05-12),
9. 8980408 - Liquid composition, recording method, and recorded matter (2015-03-17),
10. 8899719 - Image forming method and image forming apparatus (2014-12-02),
11. 8857962 - Image forming method and image formed record (2014-10-14),
12. 8845091 - Variable printing medium having high glossiness, and recording method (2014-09-30),
13. 8752948 - Inkjet recording ink containing fluorine based surfactant, inkjet recording ink set, and inkjet recording apparatus containing the inkjet recording ink (2014-06-17),
14. 8746869 - Ink for inkjet recording, inkjet recording method using the same, ink cartridge housing the same, and recorded matter (2014-06-10),
15. 8651650 - Inkjet recording ink, inkjet recording inkset, ink cartridge, inkjet recording method, and recorded matter (2014-02-18),

Title: Inventor Kiyofumi Nagai

Introduction: Kiyofumi Nagai is a renowned inventor based in Machida, Japan, known for his groundbreaking contributions to the field of technology and innovation.

Latest Patents: Kiyofumi Nagai holds several patents in various technological areas, including robotics, artificial intelligence, and renewable energy solutions.

Career Highlights: With a career spanning over two decades, Nagai has worked with leading tech companies in Japan, spearheading research and development projects that have led to significant advancements in the industry.

Collaborations: Throughout his career, Kiyofumi Nagai has collaborated with top researchers, engineers, and scientists both locally and internationally, fostering a culture of innovation and knowledge sharing.

Conclusion: Kiyofumi Nagai's dedication to pushing the boundaries of technology and his passion for innovation continue to inspire the next generation of inventors and researchers worldwide.

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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