Trademarks = 2

Forward Citations = 48

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12 inventors (with patents filed for the assignee):

Masayuki Maruyama (2 out of 2 patents)

Hiroshi Takeuchi (1 out of 2 patents)

Joichi Watanabe (1 out of 1 patent)

4. Toshitugu Ishizawa (1 out of 2 patents)

5. Tetuyuki Yamano (1 out of 1 patent)

6. Ko Chiba (1 out of 1 patent)

7. Daisaku Kobayashi (1 out of 1 patent)

8. Tatsuei Sakata (1 out of 2 patents)

9. Yoshitugu Hamada (1 out of 1 patent)

10. Ryoichi Yamauchi (1 out of 1 patent)

11. Isao Tanaka (1 out of 1 patent)

12. Akio Kawano (1 out of 1 patent)

5 patents: Sort by Forward Citations

1. 4244305 - Fluidized bed incinerator (1981-01-13),

2. 4098515 - Abrasion resisting material and use of the same (1978-07-04),

3. 4074956 - Sulphur and nitrogen treated iron based rotor for rotary piston engine (1978-02-21),

4. 4028022 - Oil seal assembly (1977-06-07),

5. 3947046 - Oil seal ring for internal combustion engine (1976-03-30),

Riken Piston Ring is a leading manufacturer of piston rings for various internal combustion engines, including automobiles, motorcycles, and marine engines. With a long history of excellence and innovation, the company is trusted by major automotive manufacturers worldwide for its high-quality products and superior engineering capabilities.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 16 2025

5 Patents

#2,450 in Tokyo

#6,487 in Japan

Tokyo, Japan

Riken Piston Ring Kogyo Kabushiki Kaisha