For the Inventor, By the Inventor

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Tanken Seiko Corp.

USPTO Granted Patents = 3

Forward Citations = 48

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4 inventors (with patents filed for the assignee):

Yataro Nagai (2 out of 8 patents)

Mitsuyoshi Matsushita (1 out of 7 patents)

Yoshiro Imai (1 out of 1 patent)

4. Kazuya Fukuoka (1 out of 1 patent)

3 patents: Sort by Forward Citations

1. 4545588 - Mechanical face seal for sealing slurry liquid (1985-10-08),

2. 4463957 - Sealing device for rotary shaft and string-like member for defining (1984-08-07),

3. 4196911 - Mechanical seal (1980-04-08),

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USPTO Data Jan 1 1976 - Oct 13 2026

3 Patents

#3,547 in Tokyo

#8,929 in Japan

Tanken Seiko Corp.

Forward Citations = 48

4 inventors:

Yataro Nagai (2 out of 8 patents)

Mitsuyoshi Matsushita (1 out of 7 patents)

Yoshiro Imai (1 out of 1 patent)

4. Kazuya Fukuoka (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Tanken Seiko Corp.. Retrieved from https://idiyas.com/company/tanken-seiko

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]

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