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Kabushiki Kaisha Riken

USPTO Granted Patents = 219

CIPO Patents = 1

EPO Patents = 79

Trademarks = 7

Forward Citations = 1,718

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271 inventors (with patents filed for the assignee):

Kiyohide Yoshida (30 out of 32 patents)

Akira Abe (23 out of 24 patents)

Gyo Muramatsu (18 out of 19 patents)

4. Naoko Irite (15 out of 15 patents)

5. Akira Kunimoto (14 out of 15 patents)

6. Satoshi Sumiya (13 out of 13 patents)

7. Takashi Ono (12 out of 13 patents)

8. Masaharu Hasei (12 out of 13 patents)

9. Osamu Yaguchi (11 out of 11 patents)

10. Mika Saito (11 out of 11 patents)

11. Masaki Moronuki (10 out of 10 patents)

12. Takuma Sekiya (9 out of 9 patents)

13. Yongtie Yan (9 out of 9 patents)

14. Yunzhi Gao (9 out of 9 patents)

15. Yuji Shima (8 out of 9 patents)

Core Competencies:

Annular Magnetic Body

Piston Ring

Strain Wave Gear

Spheroidal Graphite Cast Iron

Compression Ring

Vehicle Knuckle

Sliding Member

Sintered Valve Seat

Oil Control Ring

Roller-Type Rocker Arm

High Rigid Materials

Seal Device

219 patents: Sort by Forward Citations

1. 12476030 - Annular magnetic body for noise control and member for noise control (2025-11-18),

2. 12281709 - Piston ring and booster pump (2025-04-21),

3. 11959539 - Strain wave gear device (2024-04-16),

4. 11946109 - Spheroidal graphite cast iron and method of producing spheroidal graphite cast iron, and vehicle undercarriage parts (2024-04-02),

5. 11933407 - Compression ring (2024-03-19),

6. 11827298 - Vehicle knuckle (2023-11-28),

7. 11821524 - Combination of cylinder and piston ring (2023-11-21),

8. 11603129 - Vehicle knuckle (2023-03-14),

9. 11512777 - Piston ring (2022-11-29),

10. 11448317 - Side rail (2022-09-20),

11. 11168790 - Sliding member and piston ring (2021-11-09),

12. D927574 - Spacer for internal combustion engines (2021-08-10),

13. 11028925 - Seal ring (2021-06-08),

14. D920408 - Piston ring for internal combustion engine (2021-05-25),

15. 10914380 - Piston and piston ring for internal combustion engine (2021-02-09),

KABUSHIKI KAISHA RIKEN is a large Japanese research institution. It engages in a wide range of scientific research and development activities in various fields, including physics, chemistry, biology, and engineering. RIKEN aims to contribute to scientific knowledge, technological innovation, and the betterment of society as a whole.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 30 2025

219 Patents

#284 in Tokyo

#643 in Japan

#3,789 in the World

Kabushiki Kaisha Riken

Forward Citations = 1,718

271 inventors:

Kiyohide Yoshida (30 out of 32 patents)

Akira Abe (23 out of 24 patents)

Gyo Muramatsu (18 out of 19 patents)

4. Naoko Irite (15 out of 15 patents)

5. Akira Kunimoto (14 out of 15 patents)

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