% Expired Patents = 100.0

Forward Citations = 1

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7 inventors (with patents filed for the assignee):

Naoto Toyooka (1 out of 6 patents)

Shigeru Imai (1 out of 5 patents)

Toshiaki Higuchi (1 out of 2 patents)

4. Masaatsu Oofusa (1 out of 1 patent)

5. Yutaka Hagiwara (1 out of 1 patent)

6. Kunio Miyazaki (1 out of 5 patents)

7. Tadahiro Itoh (1 out of 2 patents)

1 patent: Sort by Forward Citations

#6,102 in Tokyo

#15,759 in Japan

Yyk Corporation

Forward Citations = 1

7 inventors:

Naoto Toyooka (1 out of 6 patents)

Shigeru Imai (1 out of 5 patents)

Toshiaki Higuchi (1 out of 2 patents)

4. Masaatsu Oofusa (1 out of 1 patent)

5. Yutaka Hagiwara (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Yyk Corporation. Retrieved from https://idiyas.com/company/yyk

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]