% Expired Patents = 33.3

Forward Citations = 123

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10 inventors (with patents filed for the assignee):

Manabu Yabe (3 out of 4 patents)

Masaharu Nakagawa (3 out of 4 patents)

Yuzo Hayashi (2 out of 5 patents)

4. Norikimi Irie (2 out of 4 patents)

5. Shinya Yamaguchi (1 out of 12 patents)

6. Yusuke Suga (1 out of 15 patents)

7. Yoshinobu Nakamura (1 out of 3 patents)

8. Tatsuo Saito (1 out of 1 patent)

9. Hiroshi Minamoto (1 out of 1 patent)

10. Yuuzou Hayashi (1 out of 1 patent)

6 patents: Sort by Forward Citations

1. 11118693 - Gate valve (2021-09-14),

2. 6966538 - Gate valve (2005-11-22),

3. 6561484 - Gate valve (2003-05-13),

4. 6561483 - Gate valve (2003-05-13),

5. 6082706 - Non-sliding vacuum gate valve (2000-07-04),

6. 5626324 - Non-sliding vacuum gate valve (1997-05-06),

Company Overview

Irie Koken Co., Ltd. is a leading manufacturer of precision machinery components in Japan. The company specializes in producing high-quality products such as gears, shafts, and valves for a wide range of industries including automotive, aerospace, and medical equipment. With a focus on innovation and quality, Irie Koken has earned a reputation for excellence in the industry.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

6 Patents

#2,469 in Tokyo

#5,990 in Japan

Tokyo, Japan

Irie Koken Co., Ltd.

Forward Citations = 123

10 inventors:

Manabu Yabe (3 out of 4 patents)

Masaharu Nakagawa (3 out of 4 patents)

Yuzo Hayashi (2 out of 5 patents)

4. Norikimi Irie (2 out of 4 patents)

5. Shinya Yamaguchi (1 out of 12 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Irie Koken Co., Ltd.. Retrieved from https://idiyas.com/company/irie-koken-company

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]