Kazukiyo Nagai

This inventor holds 104 USPTO granted patents and 8 published patent applications, plus 1 CIPO patent and 17 EPO patents, primarily in Inkjet Technology (CPC class C09D11-322). Top assignees: Ricoh Company, Ltd., Hodogaya Chemical Co., Ltd., Nissin Chemical Industry Co., Ltd.. Active years: 1991-2021.

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

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

USPTO Granted Patents = 104 (Patent Applications = 8)

% Patents Active = 51.9

CIPO Patents = 1

EPO Patents = 17 (Patent Applications = 13)

Average Co-Inventor Count = 4.9

ph-index = 23

Forward Citations = 1,309(Granted Patents)

Forward Citations (Not Self Cited) = 961(Dec 10, 2025)

Inventors with similar research interests:

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Location History:

Shizouka, JP (2001)
Shizuoka-ken, JP (2002 - 2003)
Tokyo, JP (1998 - 2006)
Numazo, JP (2013)
Numazu, JP (1991 - 2014)
Shizuoka, JP (2001 - 2021)

Company Filing History:

Hodogaya Chemical Co., Ltd.

patents

2 out of 67

Nissin Chemical Industry Co., Ltd.

patents

4. 1 out of 32

Goo Chemical Company, Ltd.

patents

5. 1 out of 834,570

Other

patents

where one patent can have more than one assignee

Years Active: 1991-2021

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Areas of Expertise:

Electrochromic Element

Ink Composition

Ink Cartridge

Inkjet Recording

Electrophotographic Photoconductor

Copolymer

Aqueous Ink

Image Forming Method

Printing Apparatus

Recording Device

Cured Matter

Coloring Material Dispersion

104 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 11209713 - Electrochromic element and electrochromic dimming element (2021-12-28),

2. 10844235 - Ink, method of manufacturing ink, and ink cartridge (2020-11-24),

3. 10781325 - Curable composition, curable ink, accommodating container, image forming device, image forming method, cured matter, and acrylamide compound (2020-09-22),

4. 10370548 - Copolymer, ink including copolymer, and ink-stored container (2019-08-06),

5. 10280321 - Ink, ink container, inkjet recording device, and recorded matter (2019-05-07),

6. 10273373 - Ink and method for producing same, and ink stored container, printing method, and printing apparatus (2019-04-30),

7. 10233341 - Ink, method of manufacturing ink, and ink cartridge (2019-03-19),

8. 10035869 - Copolymer, aqueous ink, and ink cartridge (2018-07-31),

9. 10000656 - Ink, recorded matter, ink container, recording device, and recording method (2018-06-19),

10. 9988543 - Ink, ink stored container, inkjet recording apparatus, and recorded matter (2018-06-05),

11. 9896530 - Copolymer, coloring material dispersion, ink, and ink store container (2018-02-20),

12. 9850391 - Ink, ink stored container, inkjet printing method, and inkjet printing device (2017-12-26),

13. 9850335 - Copolymer, aqueous ink, and ink cartridge (2017-12-26),

14. 9777091 - Copolymer, ink, and ink container (2017-10-03),

15. 9752037 - Inkjet recording ink, ink cartridge, inkjet recording method, inkjet recording device and ink recorded matter (2017-09-05),

Title: Innovations of Kazukiyo Nagai: A Pioneer in Electrochromic Technology

Introduction: Kazukiyo Nagai, a distinguished inventor hailing from Shizuoka, Japan, has made significant contributions to the field of electrochromic technology. With 104 patents to his name, Nagai has developed innovative solutions that enhance the functionality of electronic devices and materials.

Latest Patents: Among his recent inventions, two patents stand out. The first is an electrochromic element, which comprises a first electrode, a second electrode, and an electrolyte positioned between them. This element utilizes a polymer product created through the polymerization of an electrochromic composition, which includes a radical polymerizable compound featuring triarylamine. The second patent pertains to an ink formulation intended for industrial use. This ink comprises water, a coloring material, and a copolymer that includes a specific structural unit composition, ensuring stability and performance in various applications.

Career Highlights: Kazukiyo Nagai has had an impressive career, associated with notable companies such as Ricoh Company, Ltd. and Hodogaya Chemical Co., Ltd. His innovative spirit and technical expertise have established him as a leader in the industry, driving advancements in materials science.

Collaborations: Throughout his career, Nagai has collaborated with talented individuals like Yuusuke Koizuka and Tomoyuki Shimada. These partnerships have fostered creativity and have led to groundbreaking advancements in their respective fields.

Conclusion: Kazukiyo Nagai's remarkable achievements in innovation highlight his essential role in the advancement of electrochromic technologies. His persistent efforts and collaborative spirit continue to inspire future generations of inventors and researchers in the field.

Profile summary based on public USPTO records.