Kabushiki Kaisha Sigma

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USPTO Granted Patents = 3

Forward Citations = 84

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5 inventors (with patents filed for the assignee):

Kouichi Iimura (2 out of 2 patents)

Shunichi Nakamura (1 out of 8 patents)

Kikuo Nakamura (1 out of 3 patents)

4. Katsuki Manabe (1 out of 4 patents)

5. Susumu Ozawa (1 out of 2 patents)

3 patents: Sort by Forward Citations

1. 4923430 - Coin payout apparatus in gaming device (1990-05-08),

2. 4840290 - Bulk loaded coin dispensing machine (1989-06-20),

3. 4478407 - Monitor game machine (1984-10-23),

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USPTO Data Jan 1 1976 - Oct 27 2026

3 Patents

#3,552 in Tokyo

#8,938 in Japan

Tokyo, Japan

Kabushiki Kaisha Sigma

Forward Citations = 84

5 inventors:

Kouichi Iimura (2 out of 2 patents)

Shunichi Nakamura (1 out of 8 patents)

Kikuo Nakamura (1 out of 3 patents)

4. Katsuki Manabe (1 out of 4 patents)

5. Susumu Ozawa (1 out of 2 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Kabushiki Kaisha Sigma. Retrieved from https://idiyas.com/company/kabushiki-kaisha-sigma

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]