Forward Citations = 241

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3 inventors (with patents filed for the assignee):

Takashi Hirai (5 out of 17 patents)

Keisuke Hirai (3 out of 4 patents)

Yoshio Kaneko (2 out of 15 patents)

5 patents: Sort by Forward Citations

1. 5706617 - Roof system utilizing a solar cell (1998-01-13),

2. 5531049 - Roof mounted light transmitting frame (1996-07-02),

3. 5497587 - Roof system utilizing a solar cell (1996-03-12),

4. 5406936 - Roof (1995-04-18),

5. 5367843 - Roof apparatus (1994-11-29),

Hirai Engineering Corporation is a leading engineering firm specializing in providing innovative solutions for a wide range of industries. With a team of highly skilled professionals, we offer engineering design, consulting, and project management services to help our clients achieve their goals efficiently and effectively. Visit our website to learn more about our capabilities and how we can support your next project.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Dec 2 2025

5 Patents

#2,448 in Tokyo

#6,485 in Japan

Tokyo, Japan

Hirai Engineering Corporation

Forward Citations = 241

3 inventors:

Takashi Hirai (5 out of 17 patents)

Keisuke Hirai (3 out of 4 patents)

Yoshio Kaneko (2 out of 15 patents)

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