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Mitsui Mining Co., Ltd.

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USPTO Granted Patents = 44

Forward Citations = 465

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91 inventors (with patents filed for the assignee):

Kenji Fukuda (8 out of 11 patents)

Tatsuo Umeno (5 out of 9 patents)

Tadanori Tsunawaki (5 out of 7 patents)

4. Youichiro Hara (5 out of 6 patents)

5. Kazuhiko Hanashita (4 out of 4 patents)

6. Yoshinori Yasumoto (3 out of 3 patents)

7. Osamu Matsunaga (3 out of 6 patents)

8. Kouji Sakawaki (3 out of 3 patents)

9. Koji Sakata (3 out of 3 patents)

10. Hidemi Tsutsumi (3 out of 3 patents)

11. Tsuyoshi Ishikawa (3 out of 5 patents)

12. Yoshiro Ito (3 out of 3 patents)

13. Keiichiro Koba (3 out of 3 patents)

14. Hisashi Murakami (2 out of 17 patents)

15. Kohei Murayama (2 out of 2 patents)

Core Competencies:

Graphite Particles

Lithium Secondary Battery

Activated Coke

Desulfurization

Nitrogen Oxides

Carbon Fiber

Ceramics

Single Crystals

Coal Processing

Gas Treatment

High-Purity Alumina

Crushing Apparatus

44 patents: Sort by Forward Citations

1. 6939526 - Graphite particles and process for production thereof (2005-09-06),

2. 6884545 - Anode material for lithium secondary battery, process for production thereof, and lithium secondary battery (2005-04-26),

3. 6770399 - Composite material for anode of lithium secondary battery, and lithium secondary battery (2004-08-03),

4. 6432583 - Anode material for lithium secondary battery, process for production thereof, and lithium secondary battery (2002-08-13),

5. 6383686 - Anode material for lithium secondary battery, lithium secondary battery using said anode material, and method for charging of said secondary battery (2002-05-07),

6. 6004526 - Process for preparing cathode active material for lithium secondary (1999-12-21),

7. 5840651 - Process for the production of activated coke for simultaneous (1998-11-24),

8. 5791569 - Crushing apparatus (1998-08-11),

9. 5696049 - Catalyst for the decomposition of nitrogen oxides and a method for (1997-12-09),

10. 5587136 - Dry process desulfurization and denitrifcation process (1996-12-24),

11. 5577675 - Agitating pulverizer (1996-11-26),

12. 5525196 - Process for producing formed activated coke (1996-06-11),

13. 5392738 - Steam generator for a steam bath (1995-02-28),

14. 5333573 - Steam generator for a steam bath (1994-08-02),

15. 5330680 - Foliated fine graphite particles and method for preparing same (1994-07-19),

Company Overview

Mitsui Mining Co., Ltd., headquartered in Tokyo, specializes in the development and production of advanced materials and technologies. The company focuses on graphite particles, lithium secondary batteries, and various anode and cathode materials, catering to the growing energy storage market. Additionally, Mitsui Mining is involved in the production of activated coke and carbon fiber-reinforced materials, as well as innovative desulfurization processes and single crystal production, positioning itself as a key player in materials science and energy solutions.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Nov 10 2026

44 Patents

#868 in Tokyo

#1,868 in Japan

#15,787 in the World

Mitsui Mining Co., Ltd.

Forward Citations = 465

91 inventors:

Kenji Fukuda (8 out of 11 patents)

Tatsuo Umeno (5 out of 9 patents)

Tadanori Tsunawaki (5 out of 7 patents)

4. Youichiro Hara (5 out of 6 patents)

5. Kazuhiko Hanashita (4 out of 4 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Mitsui Mining Co., Ltd.. Retrieved from https://idiyas.com/company/mitsui-mining-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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