% Expired Patents = 33.3

Forward Citations = 1,052

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13 inventors (with patents filed for the assignee):

Kazutaka Iwata (1 out of 34 patents)

Kenji Okuna (1 out of 17 patents)

Takaomi Nishigaito (1 out of 15 patents)

4. Hidefumi Ohtsuka (1 out of 9 patents)

5. Tsutomu Iimura (1 out of 12 patents)

6. Ryoji Kojima (1 out of 6 patents)

7. Yasuyuki Tsuji (1 out of 20 patents)

8. Masataka Kawauchi (1 out of 32 patents)

9. Junichi Matsuno (1 out of 27 patents)

10. Tsuyoshi Ogasawara (1 out of 9 patents)

11. Tsuneki Kobayashi (1 out of 14 patents)

12. Katsumi Muroi (1 out of 9 patents)

13. Sayoko Ohba (1 out of 2 patents)

3 patents: Sort by Forward Citations

#3,543 in Tokyo

#8,922 in Japan

Hitachi Koki

Forward Citations = 1,052

13 inventors:

Kazutaka Iwata (1 out of 34 patents)

Kenji Okuna (1 out of 17 patents)

Takaomi Nishigaito (1 out of 15 patents)

4. Hidefumi Ohtsuka (1 out of 9 patents)

5. Tsutomu Iimura (1 out of 12 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Hitachi Koki. Retrieved from https://idiyas.com/company/hitachi-koki

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]