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Riken Keiki Co., Ltd.

USPTO Granted Patents = 21

EPO Patents = 4

Trademarks = 1

Forward Citations = 143

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32 inventors (with patents filed for the assignee):

Shuji Tajima (7 out of 7 patents)

Junichi Koyano (4 out of 4 patents)

Masahide Kitamura (4 out of 4 patents)

4. Kenichi Kojima (3 out of 3 patents)

5. Tomoo Ishiguro (3 out of 3 patents)

6. Yoshikazu Shibasaki (3 out of 5 patents)

7. Yasunori Takei (3 out of 31 patents)

8. Yukio Nakamura (2 out of 55 patents)

9. Haruhiko Kondo (2 out of 19 patents)

10. Seiichi Otani (2 out of 3 patents)

11. Mamoru Furusato (2 out of 2 patents)

12. Nobuo Nakano (2 out of 6 patents)

13. Juniti Koyano (2 out of 2 patents)

14. Akihiro Yamamoto (1 out of 51 patents)

15. Yuki Tanaka (1 out of 47 patents)

21 patents: Sort by Forward Citations

1. 11531001 - Controlled potential electrolysis gas sensor (2022-12-20),

2. 11193917 - Composition analysis apparatus and composition analysis method (2021-12-07),

3. 10816413 - Calorific value measuring device and calorific value measuring method (2020-10-27),

4. 10697920 - Gas sensor (2020-06-30),

5. 10697912 - Gas detection method and gas detector (2020-06-30),

6. 10132746 - Methane number calculation method and methane number measurement device (2018-11-20),

7. 7837935 - Joint for joining hydrogen gas running route-forming members and portable hydrogen flame ionization gas detector (2010-11-23),

8. 7526942 - Contact combustion gas sensor (2009-05-05),

9. 7479255 - Gas sensor (2009-01-20),

10. 7178381 - Portable gas detector (2007-02-20),

11. 7101716 - Formaldehyde detecting material (2006-09-05),

12. 7089779 - Portable gas detector (2006-08-15),

13. 7086283 - Explosion-proof portable gas detector (2006-08-08),

14. 6744373 - Portable gas alarm device (2004-06-01),

15. 6712586 - Gas suction pump device, gas feed adapter and gas alarm unit (2004-03-30),

RIKEN KEIKI CO., LTD. is a leading manufacturer of gas detection and environmental monitoring solutions. With over 80 years of experience, RIKEN KEIKI provides high-quality gas detectors, leak detectors, and environmental monitoring systems for a wide range of industries including oil and gas, petrochemical, mining, and wastewater treatment. Their products are known for their accuracy, reliability, and durability, helping organizations ensure workplace safety and environmental protection. To learn more about RIKEN KEIKI's products and solutions, visit their website.

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

Company Badge

USPTO Data Jan 1 1976 - Jan 6 2026

21 Patents

#1,137 in

#2,801 in

#29,088 in the World

Riken Keiki Co., Ltd.

Forward Citations = 143

32 inventors:

Shuji Tajima (7 out of 7 patents)

Junichi Koyano (4 out of 4 patents)

Masahide Kitamura (4 out of 4 patents)

4. Kenichi Kojima (3 out of 3 patents)

5. Tomoo Ishiguro (3 out of 3 patents)

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