% Expired Patents = 25.0

Forward Citations = 32

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11 inventors (with patents filed for the assignee):

Yoshio Watanabe (2 out of 44 patents)

Hiroyuki Iyama (2 out of 7 patents)

Yasushi Kinoshita (1 out of 8 patents)

4. Naoki Yotsumoto (1 out of 3 patents)

5. Keisuke Nishimura (1 out of 1 patent)

6. Daisuke Nakahara (1 out of 1 patent)

7. Norio Nakazato (1 out of 24 patents)

8. Atsuo Koyama (1 out of 2 patents)

9. Hideo Kuwahara (1 out of 1 patent)

10. Hisato Nakagawa (1 out of 1 patent)

11. Mitsuo Akatsuka (1 out of 1 patent)

4 patents: Sort by Forward Citations

1. 7671534 - Liquid crystal display, illuminant module and its manufacturing method (2010-03-02),

2. 4694224 - Lighting apparatus for an electric discharge lamp (1987-09-15),

3. 4503359 - Discharge lamp lighting device (1985-03-05),

4. 4447763 - Discharge lamp lighting device (1984-05-08),

Company Overview

Hitachi Lighting, Ltd. is a leading manufacturer of innovative lighting solutions for commercial, industrial, and residential applications. With a focus on energy efficiency and sustainability, Hitachi Lighting offers a wide range of high-quality and technologically advanced lighting products, including LED fixtures, lamps, and control systems. The company is committed to providing customers with superior lighting solutions that enhance productivity, safety, and comfort in any environment.

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 Lighting, Ltd.

Forward Citations = 32

11 inventors:

Yoshio Watanabe (2 out of 44 patents)

Hiroyuki Iyama (2 out of 7 patents)

Yasushi Kinoshita (1 out of 8 patents)

4. Naoki Yotsumoto (1 out of 3 patents)

5. Keisuke Nishimura (1 out of 1 patent)

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

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]