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For the Inventor, By the Inventor

Tokyo, Japan

Idemitsu Kosan Company, Limited


USPTO Granted Patents = 2,283

% Expired Patents = 19.4



Trademarks = 29

Forward Citations = 18,424

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1,276 inventors (with patents filed for the assignee):

goldMedal Chishio Hosokawa (214 out of 216 patents)

silverMedal Masahiro Kawamura (143 out of 144 patents)

bronzeMedal Kazuki Nishimura (107 out of 120 patents)

4.  Masakazu Funahashi (98 out of 105 patents)

5.  Toshihiro Iwakuma (88 out of 89 patents)

6.  Toshinari Ogiwara (87 out of 90 patents)

7.  Tomoki Kato (86 out of 89 patents)

8.  Masato Kaneko (77 out of 77 patents)

9.  Yumiko Mizuki (75 out of 75 patents)

10.  Kazuyoshi Inoue (73 out of 77 patents)

11.  Hirokatsu Ito (71 out of 73 patents)

12.  Yuki Nakano (67 out of 73 patents)

13.  Mitsunori Ito (64 out of 64 patents)

14.  Kenichi Fukuoka (64 out of 64 patents)

15.  Koki Yano (60 out of 62 patents)


Core Competencies:
Organic Electroluminescent Element
Solid Electrolyte
Lubricating Oil Composition
Electronic Device
Organic Electroluminescence Device
Compound
Molded Article
Polycarbonate Resin
Heat Treatment Oil
Peptide Tag
Aromatic Heterocyclic Derivative
Grease Composition

2,283 patents:

1. 12709656 - METHOD FOR PRODUCING ALPHA-OLEFIN (2026-08-18),
2. 12709604 - COMPOUND, MATERIAL FOR ORGANIC ELECTROLUMINESCENT ELEMENTS, ORGANIC ELECTROLUMINESCENT ELEMENT, AND ELECTRONIC DEVICE (2026-08-18),
3. 12590220 - Thermosetting composition, method for manufacturing molded article using the same, and cured product (2026-03-31),
4. 12584067 - Compound, material for organic electroluminescent element, organic electroluminescent element, and electronic equipment (2026-03-24),
5. 12559693 - Heat treatment oil (2026-02-24),
6. 12528915 - Polycarbonate resin composition (2026-01-20),
7. 12525641 - Sulfide solid electrolyte (2026-01-13),
8. RE50748 - Organic electroluminescence device (2026-01-06),
9. 12516240 - Compound, organic electroluminescence device using the same, and electronic apparatus (2026-01-06),
10. 12516066 - Compound, organic electroluminescence device and electronic apparatus (2026-01-06),
11. 12516042 - Aromatic heterocyclic derivative, material for organic electroluminescent element, and organic electroluminescent element (2026-01-06),
12. 12514115 - Organic electroluminescence device and electronic apparatus (2025-12-30),
13. 12494503 - Method for producing solid electrolyte (2025-12-09),
14. 12492162 - Organic electroluminescent element and electronic device (2025-12-09),
15. 12489139 - Method for producing solid electrolyte (2025-12-02),
Company Overview
Idemitsu Kosan Company, Limited, headquartered in Tokyo, Japan, specializes in the development and manufacturing of advanced materials and technologies, particularly in the field of organic electroluminescence. The company focuses on creating organic electroluminescent elements and devices, as well as solid electrolytes and lubricating oil compositions. Its innovative solutions cater to various applications in electronics and materials science, contributing to advancements in electronic devices and molded articles, including polycarbonate resins.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 13 2026

Idemitsu Kosan Company, Limited USPTO Patent Assignee Logo
2,283 Patents

#61 in Tokyo

#112 in Japan

#446 in the World

Tokyo, JP
Tokyo, Japan

Idemitsu Kosan Company, Limited

Forward Citations = 18,424

1,276 inventors:

goldMedal Chishio Hosokawa (214 out of 216 patents)

silverMedal Masahiro Kawamura (143 out of 144 patents)

bronzeMedal Kazuki Nishimura (107 out of 120 patents)

4.  Masakazu Funahashi (98 out of 105 patents)

5.  Toshihiro Iwakuma (88 out of 89 patents)

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

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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