% Expired Patents = 50.0

Forward Citations = 23

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9 inventors (with patents filed for the assignee):

Katsumi Tada (2 out of 31 patents)

Hisashi Takatori (2 out of 2 patents)

Takao Sakurai (1 out of 32 patents)

4. Ken Naono (1 out of 18 patents)

5. Masashi Egi (1 out of 20 patents)

6. Minoru Fukushima (1 out of 1 patent)

7. Morikuni Hasegawa (1 out of 1 patent)

8. Shin Takagi (1 out of 1 patent)

9. Naohiro Koizumi (1 out of 1 patent)

4 patents: Sort by Forward Citations

1. 7698423 - Computer system for estimating operational risk (2010-04-13),

2. 7653644 - Hierarchy structure data generating system (2010-01-26),

3. 7047238 - Document retrieval method and document retrieval system (2006-05-16),

4. 7010519 - Method and system for expanding document retrieval information (2006-03-07),

Company Overview

Hitachi Systems & Services, Ltd. is a leading provider of IT solutions and services for businesses across various industries. They offer a wide range of technology solutions such as cloud services, data security, IoT, and digital transformation to help organizations improve their operational efficiency and competitiveness. With a strong focus on innovation and customer satisfaction, Hitachi Systems & Services, Ltd. aims to drive positive change and deliver value to their clients.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 6 2026

4 Patents

#3,053 in Tokyo

#7,573 in Japan

Tokyo, Japan

Hitachi Systems & Services, Ltd.

Forward Citations = 23

9 inventors:

Katsumi Tada (2 out of 31 patents)

Hisashi Takatori (2 out of 2 patents)

Takao Sakurai (1 out of 32 patents)

4. Ken Naono (1 out of 18 patents)

5. Masashi Egi (1 out of 20 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Hitachi Systems & Services, Ltd.. Retrieved from https://idiyas.com/company/hitachi-systems-and-services

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]