% Expired Patents = 25.0

Forward Citations = 45

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18 inventors (with patents filed for the assignee):

Hiroshi Kametani (2 out of 3 patents)

Atsushi Yamaguchi (1 out of 84 patents)

Takashi Wada (1 out of 24 patents)

4. Mitsuo Kinoshita (1 out of 28 patents)

5. Hiroyuki Mitsufuji (1 out of 1 patent)

6. Chiaki Yoshizawa (1 out of 1 patent)

7. Tomoo Takahashi (1 out of 2 patents)

8. Tatsushi Sugiyama (1 out of 1 patent)

9. Tsutomu Fukushima (1 out of 9 patents)

10. Shunichi Sugiyama (1 out of 16 patents)

11. Hidenori Sakai (1 out of 1 patent)

12. Tomihiro Hara (1 out of 9 patents)

13. Nobuaki Ikeda (1 out of 1 patent)

14. Hideyuki Yoshikoshi (1 out of 8 patents)

15. Kasane Yamashita (1 out of 2 patents)

4 patents: Sort by Forward Citations

1. 6936673 - Anti-bonding methods for blast furnace slag or its grading adjusted slag (2005-08-30),

2. 5462686 - Method of manufacturing composite ferrite (1995-10-31),

3. 5032176 - Method for manufacturing titanium powder or titanium composite powder (1991-07-16),

4. 4889697 - Method of refining ferrous ion-containing acid solution (1989-12-26),

Company Overview

Kokan Mining Co., Ltd. is a leading mining company specializing in the extraction of precious metals and minerals. With a strong track record of sustainable and responsible mining practices, we strive to contribute to the economic development of the regions we operate in. Our skilled team of professionals ensure the highest quality standards in all our operations, making us a trusted partner in the mining industry.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

4 Patents

#3,053 in Tokyo

#7,579 in Japan

Tokyo, Japan

Kokan Mining Co., Ltd.

Forward Citations = 45

18 inventors:

Hiroshi Kametani (2 out of 3 patents)

Atsushi Yamaguchi (1 out of 84 patents)

Takashi Wada (1 out of 24 patents)

4. Mitsuo Kinoshita (1 out of 28 patents)

5. Hiroyuki Mitsufuji (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Kokan Mining Co., Ltd.. Retrieved from https://idiyas.com/company/kokan-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]