Forward Citations = 54

Loading Chart...

12 inventors (with patents filed for the assignee):

Masahiro Takahashi (1 out of 14 patents)

Tadaaki Isobe (1 out of 22 patents)

Takuji Hamada (1 out of 16 patents)

4. Kikue Niitsuma (1 out of 1 patent)

5. Shigeru Wakena (1 out of 1 patent)

6. Kinya Eguchi (1 out of 2 patents)

7. Masayoshi Ezawa (1 out of 6 patents)

8. Masaaki Imamura (1 out of 7 patents)

9. Toshihiko Uchiyama (1 out of 4 patents)

10. Ken Onuki (1 out of 6 patents)

11. Katsuhiko Yoneda (1 out of 4 patents)

12. Eiichi Takasuna (1 out of 2 patents)

4 patents: Sort by Forward Citations

1. 4922104 - Infrared microspectrometer (1990-05-01),

2. 4855993 - Method and apparatus for detecting a fault in a ring network data (1989-08-08),

3. 4844963 - Magnetic disk and method of manufacturing same (1989-07-04),

4. 4843543 - Storage control method and apparatus (1989-06-27),

Company Overview

Hitachi, Ltd. is a Japanese multinational conglomerate company headquartered in Tokyo. It operates 11 business segments including Information & Telecommunication Systems, Social Infrastructure, High Functional Materials & Components, and more. With a focus on Social Innovation Business, Hitachi aims to contribute to society through its products, technologies, and services.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

4 Patents

#1 in Chiyoda

#7,588 in Japan

Chiyoda, Japan

501 Hitachi, Ltd.

Forward Citations = 54

12 inventors:

Masahiro Takahashi (1 out of 14 patents)

Tadaaki Isobe (1 out of 22 patents)

Takuji Hamada (1 out of 16 patents)

4. Kikue Niitsuma (1 out of 1 patent)

5. Shigeru Wakena (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: 501 Hitachi, Ltd.. Retrieved from https://idiyas.com/company/501-hitachi

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]