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Chiyoda-ku, Japan

Idemitsu Kosan Company, Limited

USPTO Granted Patents = 2,276

CIPO Patents = 7

EPO Patents = 626

Trademarks = 36

Forward Citations = 18,014

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1,277 inventors (with patents filed for the assignee):

Chishio Hosokawa (213 out of 216 patents)

Masahiro Kawamura (142 out of 144 patents)

Kazuki Nishimura (106 out of 108 patents)

4. Masakazu Funahashi (98 out of 105 patents)

5. Toshinari Ogiwara (87 out of 87 patents)

6. Toshihiro Iwakuma (87 out of 89 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 (69 out of 70 patents)

12. Yuki Nakano (67 out of 67 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:

Solid Electrolyte

Organic Electroluminescence

Electronic Device

Lubricant Composition

Polycarbonate Resin

Electrode Material

COelectrolysis Device

Light Emitting Device

Polyalkylene Glycol

Molded Body

Organic EL Display

Peptide Tag

2,276 patents: Sort by Forward Citations

1. RE50748 - Organic electroluminescence device (2026-01-06),

2. 12516240 - Compound, organic electroluminescence device using the same, and electronic apparatus (2026-01-06),

3. 12516066 - Compound, organic electroluminescence device and electronic apparatus (2026-01-06),

4. 12516042 - Aromatic heterocyclic derivative, material for organic electroluminescent element, and organic electroluminescent element (2026-01-06),

5. 12514115 - Organic electroluminescence device and electronic apparatus (2025-12-30),

6. 12494503 - Method for producing solid electrolyte (2025-12-09),

7. 12492162 - Organic electroluminescent element and electronic device (2025-12-09),

8. 12489139 - Method for producing solid electrolyte (2025-12-02),

9. 12486452 - Organic electroluminescent element and electronic device (2025-12-02),

10. 12486450 - Organic electroluminescence device and electronic apparatus provided with the same (2025-12-02),

11. 12482858 - Metal element-containing sulfide-type solid electrolyte and method for producing same (2025-11-25),

12. 12481844 - Organic electroluminescent element, electronic device, and compound (2025-11-25),

13. 12477945 - Organic electroluminescence device and electronic apparatus equipped with the same (2025-11-18),

14. 12464943 - Compound and organic electroluminescent element using same (2025-11-04),

15. 12448353 - Compound, material for organic electroluminescent element, organic electroluminescent element, and electronic device (2025-10-21),

Idemitsu Kosan Company, Limited is a leading Japanese petroleum company headquartered in Tokyo. With a history spanning over a century, Idemitsu Kosan is involved in various energy-related businesses including oil exploration, production, refining, and marketing. The company also operates in the petrochemical, electricity, and renewable energy sectors. Committed to sustainability and innovation, Idemitsu Kosan strives to provide reliable energy solutions while minimizing environmental impact.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Jan 6 2026

2,276 Patents

#3 in Chiyoda-ku

#106 in Japan

#433 in the World

Chiyoda-ku, Japan

Idemitsu Kosan Company, Limited

Forward Citations = 18,014

1,277 inventors:

Chishio Hosokawa (213 out of 216 patents)

Masahiro Kawamura (142 out of 144 patents)

Kazuki Nishimura (106 out of 108 patents)

4. Masakazu Funahashi (98 out of 105 patents)

5. Toshinari Ogiwara (87 out of 87 patents)

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