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Kiyofumi Nagai

USPTO Granted Patents = 82 (Patent Applications = 3)

EPO Patents = 39 (Patent Applications = 21)

Average Co-Inventor Count = 4.0

ph-index = 24

Forward Citations = 1,651(Granted Patents)

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

Inventors with similar research interests:

Location History:

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

Company Filing History:

82 out of 28,584

Ricoh Company, Ltd.

Hokuetsu Kishu Paper Co., Ltd.

Nippon Paper Industries Co., Ltd.

4. 1 out of 134

Tokyo University of Science Foundation

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

Recording Apparatus

Image Forming Method

Aqueous Ink

Pigment Dispersion

Coloring Composition

Inkjet Medium

Liquid Composition

Variable Printing Medium

Ink Set

82 patents (USPTO):Sort by Forward CitationsExplore 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.

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