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Ranco Japan Ltd.

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USPTO Granted Patents = 3

Forward Citations = 45

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4 inventors (with patents filed for the assignee):

Keiichiroh Nakatsukasa (2 out of 2 patents)

Takao Matsumoto (1 out of 1 patent)

Kenmei Kuneguchi (1 out of 1 patent)

4. Ikuo Takahashi (1 out of 4 patents)

3 patents: Sort by Forward Citations

1. 5690144 - Directional control valve for switching the mode of operation in a heat (1997-11-25),

2. 5020771 - Proportional control valve (1991-06-04),

3. 4966194 - Four-way switching valve device (1990-10-30),

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USPTO Data Jan 1 1976 - Oct 27 2026

3 Patents

#3,552 in Tokyo

#8,938 in Japan

Ranco Japan Ltd.

Forward Citations = 45

4 inventors:

Keiichiroh Nakatsukasa (2 out of 2 patents)

Takao Matsumoto (1 out of 1 patent)

Kenmei Kuneguchi (1 out of 1 patent)

4. Ikuo Takahashi (1 out of 4 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Ranco Japan Ltd.. Retrieved from https://idiyas.com/company/ranco-japan

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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