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Koyo Seiko Kabushiki Kaisha

USPTO Granted Patents = 15

Forward Citations = 246

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34 inventors (with patents filed for the assignee):

Shuzo Hirakushi (4 out of 21 patents)

Eiki Kikuchi (2 out of 6 patents)

Toyokazu Baika (2 out of 37 patents)

4. Norihiko Nakamura (2 out of 104 patents)

5. Yoshiaki Hamasaki (2 out of 13 patents)

6. Takeo Hiramatsu (2 out of 51 patents)

7. Yoshimasa Nagayoshi (2 out of 11 patents)

8. Kenjiro Fujita (2 out of 30 patents)

9. Yatsuka Takata (2 out of 3 patents)

10. Toshio Miki (2 out of 9 patents)

11. Tadamasa Yamada (2 out of 2 patents)

12. Yoshiyuki Nakamura (2 out of 2 patents)

13. Koichi Inoue (1 out of 19 patents)

14. Kazuo Rokkaku (1 out of 8 patents)

15. Hideo Matsubara (1 out of 8 patents)

15 patents: Sort by Forward Citations

1. 5140849 - Rolling bearing with a sensor unit (1992-08-25),

2. 4995491 - Power transmission apparatus (1991-02-26),

3. 4919248 - Drive coupling unit (1990-04-24),

4. 4878394 - Drive mechanism for tiltable steering column (1989-11-07),

5. 4792244 - Ceramic bearing construction (1988-12-20),

6. 4787469 - Power steering system (1988-11-29),

7. 4784235 - Oil pressure reaction control valve for power steering apparatus (1988-11-15),

8. 4774851 - Apparatus for adjusting position of steering wheel (1988-10-04),

9. 4718514 - Steering force control device for power steering apparatus (1988-01-12),

10. 4702767 - Method of purifying a bearing steel (1987-10-27),

11. 4642219 - Bearing steel and method of manufacturing the same (1987-02-10),

12. 4640380 - Apparatus for controlling a steering force of a handle in automobiles (1987-02-03),

13. 4561390 - Variable valve-timing apparatus in an internal combustion engine (1985-12-31),

14. 4494495 - Variable valve-timing apparatus in an internal combustion engine (1985-01-22),

15. 4134596 - Oil seal apparatus (1979-01-16),

Koyo Seiko Kabushiki Kaisha, a leading manufacturer of bearings and automotive products, has been serving the industry for over a century. Known for their high-quality products and innovative solutions, the company strives to exceed customer expectations and create value for all stakeholders.

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

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USPTO Data Jan 1 1976 - Dec 30 2025

15 Patents

#318 in Osaka

#3,366 in Japan

#38,719 in the World

Koyo Seiko Kabushiki Kaisha

Forward Citations = 246

34 inventors:

Shuzo Hirakushi (4 out of 21 patents)

Eiki Kikuchi (2 out of 6 patents)

Toyokazu Baika (2 out of 37 patents)

4. Norihiko Nakamura (2 out of 104 patents)

5. Yoshiaki Hamasaki (2 out of 13 patents)

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