% Expired Patents = 50.0

Forward Citations = 38

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7 inventors (with patents filed for the assignee):

Takashi Abe (1 out of 2 patents)

Toichi Hirata (1 out of 91 patents)

Osamu Tomikawa (1 out of 10 patents)

4. Satoshi Nozaki (1 out of 1 patent)

5. Osamu Arai (1 out of 1 patent)

6. Kazuhiro Arai (1 out of 1 patent)

7. Kazuhiro Sunamura (1 out of 4 patents)

2 patents: Sort by Forward Citations

1. 7032692 - Drilling device for earth drill (2006-04-25),

2. 5048296 - Anti-vibration apparatus in a hydraulic system for boom cylinder of (1991-09-17),

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

2 Patents

#4,372 in Tokyo

#11,139 in Japan

Tokyo, Japan

Hitachi Construction Co., Ltd.

Forward Citations = 38

7 inventors:

Takashi Abe (1 out of 2 patents)

Toichi Hirata (1 out of 91 patents)

Osamu Tomikawa (1 out of 10 patents)

4. Satoshi Nozaki (1 out of 1 patent)

5. Osamu Arai (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Hitachi Construction Co., Ltd.. Retrieved from https://idiyas.com/company/hitachi-construction-company

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]