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Nippon Kokan Kabushiki Kaisha

USPTO Granted Patents = 487

Trademarks = 2

Forward Citations = 3,599

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915 inventors (with patents filed for the assignee):

Hirokazu Nomura (19 out of 45 patents)

Hiroaki Nishio (17 out of 37 patents)

Yuji Sugitani (16 out of 26 patents)

4. Takeo Yamada (15 out of 77 patents)

5. Tsuneo Miyashita (14 out of 22 patents)

6. Seigo Ando (14 out of 24 patents)

7. Takeshi Adaniya (14 out of 16 patents)

8. Shuzo Fukuda (14 out of 18 patents)

9. Hiroshi Kuwamoto (14 out of 14 patents)

10. Kazuo Kunioka (13 out of 15 patents)

11. Nobuhisa Hasebe (13 out of 14 patents)

12. Itaru Watanabe (12 out of 31 patents)

13. Shiro Fukunaka (12 out of 12 patents)

14. Shinji Akita (11 out of 11 patents)

15. Michio Nakayama (10 out of 10 patents)

Core Competencies:

Thermo Plastic Pipes

Corrosion-Protective Coating

Cold Rolled Steel Sheet

Surface Combustion Burner

Vibration-Damping Composite

Coal Gasification Apparatus

High Silicon Steel

Sintered Body Manufacturing

Lubricating Oil Composition

Continuous Casting Machine

Magnetic Metal Powder

Offshore Fish Cage

487 patents: Sort by Forward Citations

1. 6029727 - Jointing apparatus of thermo plastic pipes (2000-02-29),

2. 5926936 - Method for applying corrosion-protective coating to joint between (1999-07-27),

3. 5451284 - Self-mobile work vehicle moveable through pipeline and method and (1995-09-19),

4. 5405463 - Continuous annealing process of producing cold rolled mild steel sheet (1995-04-11),

5. 5224856 - Surface combustion burner (1993-07-06),

6. 5195344 - Warm rolling facility for steel strip coils (1993-03-23),

7. 5161965 - Surface combustion burner (1992-11-10),

8. 5116571 - Chromoum heat-resistant steel excellent in toughness and having high (1992-05-26),

9. 5094764 - Method for supplying a lubricating oil composition (1992-03-10),

10. 5093204 - Vibration-damping composite sheet steel (1992-03-03),

11. 5089031 - Coal gasification apparatus using coal powder (1992-02-18),

12. 5082510 - Method for producing non-oriented steel sheets (1992-01-21),

13. 5078809 - Method for producing cold-rolled steel sheet (1992-01-07),

14. 5064982 - Electric resistance seam welding method (1991-11-12),

15. 5035847 - Mold for slip casting (1991-07-30),

Nippon Kokan Kabushiki Kaisha (NKK) is a global engineering company based in Japan. NKK specializes in various areas such as steel production, shipbuilding, and energy solutions. With a rich history and expertise, NKK continues to innovate and provide high-quality products and services to its customers worldwide.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 23 2025

487 Patents

#170 in Tokyo

#381 in Japan

#1,920 in the World

Nippon Kokan Kabushiki Kaisha

Forward Citations = 3,599

915 inventors:

Hirokazu Nomura (19 out of 45 patents)

Hiroaki Nishio (17 out of 37 patents)

Yuji Sugitani (16 out of 26 patents)

4. Takeo Yamada (15 out of 77 patents)

5. Tsuneo Miyashita (14 out of 22 patents)

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