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For the Inventor, By the Inventor

Tokyo, Japan

Idemitsu Kosan., Ltd.

Calculating rank
USPTO Granted Patents = 92

% Expired Patents = 1.1



Forward Citations = 72

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179 inventors (with patents filed for the assignee):

goldMedal Kazuki Nishimura (13 out of 121 patents)

silverMedal Satomi Tasaki (13 out of 53 patents)

bronzeMedal Masatoshi Saito (8 out of 36 patents)

4.  Yuki Nakano (6 out of 73 patents)

5.  Hiroaki Toyoshima (6 out of 13 patents)

6.  Yuki Nakano (6 out of 35 patents)

7.  Tasuku Haketa (6 out of 6 patents)

8.  Masato Nakamura (5 out of 111 patents)

9.  Hiroaki Itoi (5 out of 17 patents)

10.  Natalia Chebotareva (5 out of 25 patents)

11.  Michelle Groarke (5 out of 5 patents)

12.  Tetsuya Masuda (4 out of 31 patents)

13.  Kei Yoshida (4 out of 59 patents)

14.  Mikio Hamano (4 out of 5 patents)

15.  Kyohei Horiguchi (4 out of 4 patents)


Core Competencies:
Organic Electroluminescent Element
Electronic Device
Photoelectric Conversion Element
Corrosion Inhibitor
Lithium-Ion Battery
Lubricant Composition
Thermosetting Composition
Sulfide Solid Electrolyte
Polycarbonate Resin
Color Conversion Particle
Grease Composition
Aromatic Polyether

92 patents:

1. 12774293 - Compound, material for organic electroluminescent element, organic electroluminescent element and electronic device (2026-10-27),
2. 12772685 - Organic electroluminescent element, organic electroluminescent display apparatus, and electronic device (2026-10-20),
3. 12772655 - Organic electroluminescent element and electronic device (2026-10-20),
4. 12770911 - Modified sulfide solid electrolyte and method for producing same (2026-10-20),
5. 12767787 - Resin composition, binder for battery, electrode mixture layer for battery, electrolyte layer, sheet for battery, battery, and resin composition production method (2026-10-20),
6. 12767548 - Method for producing lithium hydroxide (2026-10-20),
7. 12763362 - Modified sulfide solid electrolyte and manufacturing method therefor (2026-10-13),
8. 12757633 - Organic electroluminescence device and electronic apparatus (2026-10-06),
9. 12757568 - Organic electroluminescence device, light emitting device, organic electroluminescence display device and electronic device (2026-10-06),
10. 12757446 - Semiconductor device (2026-10-06),
11. 12753341 - Organic electroluminescent element and electronic device (2026-10-06),
12. 12753145 - Aromatic amine derivative, and organic electroluminescent element using same (2026-10-06),
13. 12751204 - Compound, material for organic electroluminescent element, organic electroluminescent element and electronic device (2026-09-29),
14. 12738499 - Modified sulfide solid electrolyte and production method for same, and electrode combined material and lithium-ion battery (2026-09-15),
15. 12735633 - Compound, material for organic electroluminescent elements, organic electroluminescent element, and electronic device (2026-09-15),
Company Overview
Idemitsu Kosan, Ltd., headquartered in Tokyo, Japan, is a prominent player in the field of organic electroluminescence. The company specializes in the development and manufacturing of advanced materials and technologies, including organic electroluminescent elements and electronic devices. Idemitsu's expertise extends to photoelectric conversion elements, lithium-ion batteries, and corrosion inhibitors, positioning it as a key innovator in energy and materials science. The organization is committed to enhancing performance across various applications, including lubricants and thermosetting compositions.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 27 2026

92 Patents

#575 in Tokyo

#1,186 in Japan

#8,399 in the World

Tokyo, JP
Tokyo, Japan

Idemitsu Kosan., Ltd.

Forward Citations = 72

179 inventors:

goldMedal Kazuki Nishimura (13 out of 121 patents)

silverMedal Satomi Tasaki (13 out of 53 patents)

bronzeMedal Masatoshi Saito (8 out of 36 patents)

4.  Yuki Nakano (6 out of 73 patents)

5.  Hiroaki Toyoshima (6 out of 13 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Idemitsu Kosan., Ltd.. Retrieved from https://idiyas.com/company/idemitsu-kosan

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

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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