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Mitsui Minings & Melting Co., Ltd.

USPTO Granted Patents = 817

CIPO Patents = 5

EPO Patents = 150

Trademarks = 18

Forward Citations = 4,269

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903 inventors (with patents filed for the assignee):

Yoshinori Matsuura (34 out of 34 patents)

Shinya Kagei (34 out of 34 patents)

Yunosuke Nakahara (29 out of 29 patents)

4. Takao Hayashi (25 out of 29 patents)

5. Toshimi Nakamura (24 out of 24 patents)

6. Yoshimi Hata (22 out of 22 patents)

7. Makoto Dobashi (21 out of 22 patents)

8. Tetsuro Sato (21 out of 21 patents)

9. Kiyoshi Yamagishi (21 out of 21 patents)

10. Atsushi Koike (19 out of 60 patents)

11. Toshifumi Matsushima (16 out of 16 patents)

12. Tetsuya Mitsumoto (16 out of 16 patents)

13. Yutaka Hirasawa (16 out of 17 patents)

14. Naotomi Takahashi (16 out of 16 patents)

15. Kazuo Moriya (16 out of 17 patents)

Core Competencies:

Solid Electrolyte

Electrochemical Element

Gas Concentration Measurement

Exhaust Gas Purification

Copper Foil Technology

Solid-State Battery

Composite Materials

Pharmaceutical Compositions

Electrode Catalyst Layer

Hydrocarbon Adsorbent

Multilayer Wiring Board

Conductive Resin Composition

817 patents: Sort by Forward Citations

1. 12480909 - Solid electrolyte, electrochemical element, and limiting current type gas sensor (2025-11-25),

2. 12480905 - Gas concentration measuring device and method for measuring concentration of analyte gas in sample gas (2025-11-25),

3. 12473207 - Tantalate dispersion and tantalate compound (2025-11-18),

4. 12472206 - Pharmaceutical composition containing cerium compound as active ingredient (2025-11-18),

5. 12465908 - Exhaust gas purification catalyst (2025-11-11),

6. 12457686 - Roughened copper foil, copper-cladded laminate board, and printed wiring board (2025-10-28),

7. 12431533 - Solid electrolyte, and electrode mixture, solid electrolyte layer and solid-state battery, each using same (2025-09-30),

8. 12424656 - Solid electrolyte, and electrode mixture, solid electrolyte layer and solid-state battery, each using same (2025-09-23),

9. 12424626 - Composite material, and method for manufacturing same (2025-09-23),

10. 12407012 - Solid electrolyte assembly having intermediate layer (2025-09-02),

11. 12399001 - Method for measuring surface parameter of copper foil, and method for sorting copper foil (2025-08-26),

12. 12397345 - Powder for film formation or sintering (2025-08-26),

13. 12374682 - Active material and process for producing the same (2025-07-29),

14. 12365025 - Fine metal linear body (2025-07-22),

15. 12354764 - Silver powder, method for producing same, and conductive resin composition (2025-07-08),

Company Badge

USPTO Data Jan 1 1976 - Dec 9 2025

817 Patents

#115 in Tokyo

#257 in Japan

#1,196 in the World

Mitsui Minings & Melting Co., Ltd.

Forward Citations = 4,269

903 inventors:

Yoshinori Matsuura (34 out of 34 patents)

Shinya Kagei (34 out of 34 patents)

Yunosuke Nakahara (29 out of 29 patents)

4. Takao Hayashi (25 out of 29 patents)

5. Toshimi Nakamura (24 out of 24 patents)

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