For the Inventor, By the Inventor

Enter assignee name

Benkan Corporation

USPTO Granted Patents = 14

Forward Citations = 723

Loading Chart...

Loading Chart...

23 inventors (with patents filed for the assignee):

Toshiaki Iwabuchi (4 out of 4 patents)

Shigeyuki Matsumoto (3 out of 8 patents)

Masao Kanazawa (2 out of 10 patents)

4. Yoshitomo Fukushima (2 out of 5 patents)

5. Kazuhisa Sato (2 out of 2 patents)

6. Miyoshi Kimura (2 out of 2 patents)

7. Kouki Tada (2 out of 2 patents)

8. Yutaka Yoshida (1 out of 104 patents)

9. Hideaki Higuchi (1 out of 1 patent)

10. Tomoyoshi Kawamura (1 out of 1 patent)

11. Takaomi Hanyu (1 out of 1 patent)

12. Kazushi Ohhashi (1 out of 1 patent)

13. Katsuhiko Honma (1 out of 1 patent)

14. Kenji Miyatani (1 out of 2 patents)

15. Mitsuaki Motoda (1 out of 2 patents)

14 patents: Sort by Forward Citations

1. 6321780 - Valve for controlling flow rate of gas (2001-11-27),

2. 6216739 - Integrated gas control device (2001-04-17),

3. 6073646 - Gas controlling device for integration (2000-06-13),

4. 6012479 - Integrated gas control device (2000-01-11),

5. 5755255 - Gate valve for regulating gas flow in semiconductor manufacturing (1998-05-26),

6. 5752548 - Coupling for drainage pipings (1998-05-19),

7. 5678595 - Vacuum exhaust valve (1997-10-21),

8. 5658021 - Pipe joint (1997-08-19),

9. 5390895 - Slow vent valve (1995-02-21),

10. 5326078 - Metal diaphragm valve (1994-07-05),

11. 5295660 - Metal diaphragm valve with lock mechanism (1994-03-22),

12. 5112027 - Metal diaphragm valve (1992-05-12),

13. 5108069 - Metal diaphragm valve (1992-04-28),

14. 4998754 - Drainpipe joint (1991-03-12),

Benkan Corporation is a leading provider of industrial services, specializing in plumbing, electrical, and HVAC solutions. With a team of highly skilled technicians and a commitment to quality workmanship, Benkan Corporation has earned a reputation for excellence in the industry. Whether it's a commercial project or a residential repair, Benkan Corporation is dedicated to delivering top-notch service to all of its customers.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Sep 29 2026

14 Patents

#1,596 in Tokyo

#3,573 in Japan

#42,168 in the World

Benkan Corporation

Forward Citations = 723

23 inventors:

Toshiaki Iwabuchi (4 out of 4 patents)

Shigeyuki Matsumoto (3 out of 8 patents)

Masao Kanazawa (2 out of 10 patents)

4. Yoshitomo Fukushima (2 out of 5 patents)

5. Kazuhisa Sato (2 out of 2 patents)

Please report any incorrect information to [email protected]

Loading…