% Expired Patents = 50.0

EPO Patents = 1

Forward Citations = 1

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7 inventors (with patents filed for the assignee):

Kazuki Houzan (2 out of 2 patents)

Akira Nagai (1 out of 96 patents)

Koji Kai (1 out of 1 patent)

4. Kazuhiro Suzuki (1 out of 36 patents)

5. Kouji Kai (1 out of 1 patent)

6. Mitoshi Kai (1 out of 1 patent)

7. Tuyosi Shinozaki (1 out of 1 patent)

8. Kai Koji (0 patent)

9. Houzan Kazuki (0 patent)

10. Nagai Akira (0 patent)

11. Suzuki Kazuhiro (0 patent)

2 patents: Sort by Forward Citations

#400 in Kanagawa

#11,139 in Japan

Koyo Giken Inc.

Forward Citations = 1

7 inventors:

Kazuki Houzan (2 out of 2 patents)

Akira Nagai (1 out of 96 patents)

Koji Kai (1 out of 1 patent)

4. Kazuhiro Suzuki (1 out of 36 patents)

5. Kouji Kai (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Koyo Giken Inc.. Retrieved from https://idiyas.com/company/koyo-giken

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]

1 patent (EPO):

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]