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Hitachi Kyowa Kogyo Co., Ltd.

USPTO Granted Patents = 3

Forward Citations = 25

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14 inventors (with patents filed for the assignee):

Koichi Kurosawa (2 out of 15 patents)

Yutaka Watanabe (1 out of 47 patents)

Takayuki Numata (1 out of 3 patents)

4. Hideyo Saito (1 out of 7 patents)

5. Kikuo Takeshima (1 out of 2 patents)

6. Masato Koshiishi (1 out of 5 patents)

7. Shigeo Hattori (1 out of 13 patents)

8. Hiroshi Tsujimura (1 out of 3 patents)

9. Yasumasa Tamai (1 out of 10 patents)

10. Takenori Shindo (1 out of 3 patents)

11. Seiichi Toyoda (1 out of 1 patent)

12. Masayuki Kurihara (1 out of 2 patents)

13. Yositeru Chiba (1 out of 2 patents)

14. Shin Kumagai (1 out of 1 patent)

3 patents: Sort by Forward Citations

1. 5633094 - Valve having facing layers of co-free Ni-base Alloy (1997-05-27),

2. 5494539 - Metal member quality improving method by spot welding (1996-02-27),

3. 5227124 - Method and structure for preventive maintaining an elongated metal (1993-07-13),

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USPTO Data Jan 1 1976 - Dec 30 2025

3 Patents

#3,260 in Tokyo

#8,767 in Japan

Hitachi Kyowa Kogyo Co., Ltd.

Forward Citations = 25

14 inventors:

Koichi Kurosawa (2 out of 15 patents)

Yutaka Watanabe (1 out of 47 patents)

Takayuki Numata (1 out of 3 patents)

4. Hideyo Saito (1 out of 7 patents)

5. Kikuo Takeshima (1 out of 2 patents)

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