Hatamura Engine Research Office Ltd.

Calculating rank

USPTO Granted Patents = 2

% Expired Patents = 50.0

EPO Patents = 1

Forward Citations = 5

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6 inventors (with patents filed for the assignee):

Koichi Hatamura (2 out of 22 patents)

Jun Bota (1 out of 1 patent)

Taizo Fujimura (1 out of 1 patent)

4. Susumu Takayama (1 out of 1 patent)

5. Toshio Yamada (1 out of 1 patent)

6. Atsushi Morita (1 out of 4 patents)

7. Toshio Yamada (0 patent)

2 patents: Sort by Forward Citations

1. 9494061 - Variable valve system (2016-11-15),

2. 8534261 - Four-cycle engine (2013-09-17),

Company Badge

USPTO Data Jan 1 1976 - Nov 3 2026

2 Patents

#95 in Hiroshima, 729-3431

#11,154 in Japan

Hiroshima, Japan

Hatamura Engine Research Office Ltd.

Forward Citations = 5

6 inventors:

Koichi Hatamura (2 out of 22 patents)

Jun Bota (1 out of 1 patent)

Taizo Fujimura (1 out of 1 patent)

4. Susumu Takayama (1 out of 1 patent)

5. Toshio Yamada (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Hatamura Engine Research Office Ltd.. Retrieved from https://idiyas.com/company/hatamura-engine-research-office

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]