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Toyo Kohan., Ltd.

USPTO Granted Patents = 8

% Expired Patents = 25.0

Forward Citations = 22

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29 inventors (with patents filed for the assignee):

Hironao Okayama (2 out of 19 patents)

Yasuo Tahara (2 out of 5 patents)

Tsuneyuki Ide (2 out of 8 patents)

4. Koh Yoshioka (2 out of 2 patents)

5. Etsuro Tsutsumi (2 out of 2 patents)

6. Nobuaki Mukai (1 out of 15 patents)

7. Akira Ikeda (1 out of 6 patents)

8. Kinji Saijo (1 out of 26 patents)

9. Hiroaki Okamoto (1 out of 10 patents)

10. Hiroaki Kawamura (1 out of 9 patents)

11. Yoshiyuki Sugimoto (1 out of 6 patents)

12. Setsuo Takaki (1 out of 1 patent)

13. Hiroshi Fujishige (1 out of 1 patent)

14. Yoshihiko Isobe (1 out of 11 patents)

15. Noriaki Kaguma (1 out of 5 patents)

8 patents: Sort by Forward Citations

1. 12692616 - Roughened plated sheet (2026-07-28),

2. 12640375 - Surface-treated sheet for alkaline secondary battery and method for manufacturing same (2026-05-26),

3. 12604417 - Copper clad laminate and method for producing the same (2026-04-14),

4. 12540903 - Pinhole detection device (2026-02-03),

5. 6777863 - Material for aperture grill for color picture tube, process for making the same, aperture grill, and picture tube (2004-08-17),

6. 6583545 - Aperture grill material for color picture tube, production method thereof, aperture grill and picture tube (2003-06-24),

7. 6531242 - Enclosed cell and sealer (2003-03-11),

8. 6200409 - Method and apparatus for manufacturing metallic sheet covered with thermoplastic resin (2001-03-13),

Toyo Kohan Co., Ltd. is a Japanese company primarily engaged in the manufacture and sale of various steel products. The company operates through two business segments: Steel Business and Printing, Packaging, and Information Business. Its products include tinplate, blackplate, tin-free steel, and laminated steel sheets. Toyo Kohan serves customers in the automotive, construction, and packaging industries worldwide.

Profile summary based on public USPTO records.

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USPTO Data Jan 1 1976 - Sep 29 2026

8 Patents

#2,145 in Tokyo

#5,035 in Japan

Toyo Kohan., Ltd.

Forward Citations = 22

29 inventors:

Hironao Okayama (2 out of 19 patents)

Yasuo Tahara (2 out of 5 patents)

Tsuneyuki Ide (2 out of 8 patents)

4. Koh Yoshioka (2 out of 2 patents)

5. Etsuro Tsutsumi (2 out of 2 patents)

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